Sustainable Energy: Challenges and Perspectives

Abstract

Currently, energy security, sustainable development and wellbeing are the energy policy drivers throughout the world. India has made significant progress, far more rapidly in the past 2 years, increasing the installed capacity of sustainable energy, and potentially this upward drift is anticipated to persist. The innovation in new and advanced technologies, aggressive energy policies, action, and planning activities has enabled India to resolve the barriers of commercial production of sustainable energy. The domestic production and use of renewable energy, such as off-grid power sources, i.e., solar power, wind power, small hydropower, biofuels and bioenergy from new biomass will help to reduce the fossil fuel use and its imports from other countries.

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175© Springer Nature Singapore Pte Ltd. 2019
S. Shah et al. (eds.), Sustainable Green Technologies for Environmental
Management, https://doi.org/10.1007/978-981-13-2772-8_9
Chapter 9
Sustainable Energy: Challenges
andPerspectives
S.Prasad, K.R.Sheetal, V.Venkatramanan, S.Kumar, andS.Kannojia
Abstract Currently, energy security, sustainable development and wellbeing are
the energy policy drivers throughout the world. India has made signicant progress,
far more rapidly in the past 2years, increasing the installed capacity of sustainable
energy, and potentially this upward drift is anticipated to persist. The innovation in
new and advanced technologies, aggressive energy policies, action, and planning
activities has enabled India to resolve the barriers of commercial production of sus-
tainable energy. The domestic production and use of renewable energy, such as off-
grid power sources, i.e., solar power, wind power, small hydropower, biofuels and
bioenergy from new biomass will help to reduce the fossil fuel use and its imports
from other countries.
Sustainable economic and industrial growth also requires safe and sustainable
energy resources. The use of sustainable energy will help in strengthening low-
carbon energy in India and providing a clean environment through reduction of
pollutants and greenhouse gas emissions. Prospective attention to nancial and
development needs by the use of sustainable energy will also improve the living
standards of society with equity and economic sustainability. There is a strong need
to extensively adopt and use sustainable energy technologies to supply off-grid
power, especially in the areas with difculty in accessing the central grid power,
such as un-electried villages, remote areas, and hilly terrains. Finally, these sus-
tainable energy sources offer massive benets and can contribute signicantly to
ensuring a secure energy future for India.
S. Prasad (*) · S. Kumar · S. Kannojia
Centre for Environment Science and Climate Resilient Agriculture,
Indian Agricultural Research Institute, New Delhi, India
K. R. Sheetal
Central Arid Zone Research Institute, Regional Research Station,
Bikaner, Rajasthan, India
V. Venkatramanan
School of Interdisciplinary and Transdisciplinary Studies,
Indira Gandhi National Open University, New Delhi, India

176
Keywords Renewable energy · Sustainable energy · Solar energy · Biomass
energy · Fossil fuels
9.1 Introduction
Energy is a key driver for agriculture, industries, and service sectors that inuence
economic development, but today’s rising concern over its sustainability has put
India in a critical position. The burning of fossil fuels causes multiple environmen-
tal problems such as air pollution and global climate change (Zidanšek etal. 2009).
Global change threatens the very existence of life. Transforming the present coal
dominated energy mix to renewable and sustainable energy dominated energy use is
one of the herculean tasks facing India (Institute for Energy Research 2014). A ne
balance of environmental sustainability with necessary economic development is
required. On the other hand, the transition to sustainable and renewable energy tech-
nologies provides an opportunity to address not only the environmental problems
but also overall economic and developmental needs to improve the living standards
of people with equity and economic sustainability (IAC 2007).
The global community is becoming increasingly clear that management of the
considerable risks due to air pollution and climate change, necessitates reduction in
fossil fuel utilization, as has been explained in several reports including the fth
assessment report released by IPCC.It is of utmost importance, urgency and prior-
ity that a policy objective of nding ways and methods to generate and use energy
that helps to preserve the integrity of elementary natural systems, arrest environ-
mental degradation and sustain development toward a more sustainable, fair and
civilized world (IAC 2007). Solar, wind and water-based energy and biofuels are a
few examples of sustainable energy (IAC 2007; Steven and Majumdar 2012). The
innovation in new and advanced energy technologies has enabled India to resolve
the barriers of commercial production of sustainable energy. Therefore, sustainable
energy and low-carbon technologies could provide ways for development opportu-
nities that result in a world that is healthy, viable and has a secure energy source
(Steven and Majumdar 2012).
9.2 Energy Consumption Pattern: Global Scenario
According to 5th Assessment Report of IPCC, the world energy consumption is ris-
ing at the rate of 2.3% annually (IPCC 2014). The global energy mix in 2012 was
dominated by coal, natural gas, and oil with 87%. However, the dominance changes
between these three sources with year, although only marginally. In the same year,
while the contribution of natural gas and coal increased 0.1% and 0.2%, that of oil
reduced by 0.3%, in the global energy consumption. This trend was predicted to
S. Prasad et al.

177
lead to replacement of oil by coal by the year 2017 by the International Energy
Agency (IEA) (World Watch Institute 2015). The IEA also expects an increase in
global energy requirement under the existing scenario, from 12 to approximately
17billion tonne oil equivalents (t.o.e.) in the time period from 2009 to 2035 (WEO
2009).
9.3 Energy Consumption Pattern: Indian Scenario
India was the 3rd largest consumer of petroleum products and crude oil in 2015, and
it was also the 3rd largest net importer of crude oil and petroleum products after the
United States and China in 2016 (IBEF 2017). The Indian energy demand is rising
at a rate of 6.5% year−1. With energy consumption of 0.55 tonnes of oil equivalent
per capita, India’s consumption is far below the international average of 1.9 tonnes;
but the consumption is expected to almost double by 2035 (The Hans India 2017).
With a gap of more than four times between the demand (4million barrels per day)
and production (1million barrels per day) of oil as of 2015, the gap between India’s
oil demand and supply is widening (Dunn 2016). India’s consumption was nearly
194million tonnes in 2016–2017 as against 148million tonnes in 2012 scal. By
2040, the Indian oil production predicted to remain steady while the oil demand is
predicted by IEA to increase up to 7.5million barrels per day. Energy companies in
India are hence turning to other energy sources to reduce the country’s dependency
on oil imports.
The net oil import dependency of India rose from 43% in 1990 to 75% in 2015
that resulted in a massive strain on the current account as well as the government
exchequer (US EIA 2014; Dunn 2016). The transport sector accounts for the most
signicant share in terms of utilization of petroleum products in India, consuming
nearly 70% of diesel and 99.6% petroleum, and the demand is anticipated to show
a growth of 6–8% in the coming time in tandem with the rapidly growing vehicle
ownership. This implies that imports will also rise to 92% by 2030 (WEO 2009).
With domestic oil production providing only one-fourth of the national demand,
energy security has emerged as a vital question for India. This situation necessitates
the production of alternate energy from readily available resources (IEC 2015).
9.4 Energy andEnvironmental Quality
The advancements in scientic monitoring capabilities and increased awareness in
recent past has shed more light on the more understated effects associated with
energy production, conversion, and use, on ecology and environment like being the
cause for pollution and climate (Levine 1991; World Watch Institute 2015).
9 Sustainable Energy: Challenges andPerspectives

178
9.4.1 Fossil Fuels andAir Pollution
Present energy and transportation systems, mainly based on fossil fuels, are the
most signicant contributor to air pollution throughout the world. The burning of
fossil fuel releases carbon monoxide (CO), Volatile Organic Compounds (VOCs),
nitrogen oxides (NOx) and particulate matter (PM). In the presence of sunlight, the
VOC and NOx mixture results in ozone (O3) formation in the troposphere, the lead-
ing constituent of photochemical smog (Levine 1991). Coal-based power plants are
known to have higher CO2 emissions and other pollutants per kWh electricity gen-
eration (IEA 2004).
The combustion of coal also severely affects local air quality by emitting sulfur
dioxide (Institute for Energy Research 2014). Contributing about 40% and 38% of
gross CO2 and ozone, burning of biomass is also a grave source of gaseous emis-
sions (Levine 1991). In addition, combustion of biomass as fuels in conventional
systems also contribute to 1.4million tonnes (MT) of methane (CH4). The emissions
are not the only points of ecological concern while using energy (Prasad etal. 2012).
Hence, this energy system is turning out to be unsustainable, and sustainability is an
essential criterion for energy in this century (Steven and Majumdar 2012).
9.4.2 Fossil Fuels andGlobal Climate Change
One of the signicant threats facing the world today is climate change (Zidansek
etal. 2009). According to IPCC 5th Assessment Report, the major anthropogenic
contributor to climate change is the use of fossil fuels (coal, gas, oil) which came
into practice at the dawn of the industrial era, which amplied the atmospheric con-
centration of heat-trapping greenhouse gases. Atmospheric greenhouse gas concen-
tration since the pre-industrial revolution to the recent time and global warming
potential is given in Table9.1 (Blasing 2014). The report also reveals that of the
10GtCO2eq increase in annual anthropogenic GHG emission that occurred in the
last decade (2001–2010), energy supply was the major contributor with 47%,
followed by industry, transport and building sectors with 30%, 11% and 3% respec-
tively (IPCC 2014).
Table 9.1 Recent tropospheric greenhouse gas (GHG) concentrations
GHGs Pre-1750 level Recent level
GWP(100-year
time horizon)
Increased radiative
forcing (W/m2)
CO2280 395.4ppm 1 1.88
CH4722 1893/1762ppb 28 0.49
N2O 270 326/324ppb 265 0.17
O3237 337ppb n.a. 0.40
CFC- 11 zero 236/234ppt 4660 0.061
Source: Blasing (2014)
S. Prasad et al.

179
According to IPCC 5th Assessment Report, more than three-fourth of the increase
in greenhouse gas emissions in the 40years since 1970 was mainly from industry
and burning fossil fuels. CO2 emissions from fossil fuel use have touched 32 (±2.7)
GtCO2/year, in 2010, and increased further by about 3% during the next year and
approximately 1–2% in the year after (IPCC 2014). Global climate change is
predicted to cause irreversible and irreparable adverse impacts on agriculture, health
sector and on the earth and the ecosystem as a whole (IPCC 2014).
The herculean and insurmountable task of reducing GHG emissions by 60–80%
by 2050 compared to 1990s, necessary to limit temperature rise to 2°C above pre-
industrial levels and to stabilize CO2 concentrations below 550ppm, requires a total
shift to low-carbon emission technologies that can effectively tackle climate change
(IPCC 2014). It was observed that global CO2 emissions from fossil fuels and indus-
try were almost stable in the years 2014 to 2016, increasing only 0.2%, against the
2.2% average rise during the previous decade. This decline was primarily due to
decreasing in global coal use and improvement in efciency of energy use and
increased utilization of renewable alternative energy sources (REN21 2017). India
is also developing its various renewable energy sources, especially power genera-
tion from solar, wind, biomass, and other viable alternative sources (Zidansek etal.
2009). From 2012 onwards, India has started reforms in oil and gas pricing to pro-
mote sustainable investment and to lower subsidy costs (Dani 2014), which could
efciently augment energy supply, at the same time improving energy efciency in
India (Prasad etal. 2014).
9.5 Renewable andSustainable Energy
Solar energy, wind power, and biofuels are examples of renewable energy which
refers to the energy obtained from natural resources that will not deplete over time
(Farrel and Gopal 2008). Non-renewable energy sources like fossil fuels form over
millions of years and hence do not regenerate easily. The technologies developed to
exploit renewable energies are known as renewable energy technologies (RET) or
clean technologies or green energy. Sustainable energy goes one step further in
terms of energy efciency than renewable energy. Optimizing energy supply and
use leading to minimum wastage leads to higher energy efciency (Beckett 2012).
Renewable energy base and energy efciency are the twin pillars of sustainable
energy.
Sustainable energy systems, technologies or resources support economic and
human development needs, at the same time conserving the environment, reducing
climate change risks by reducing GHG emissions, giving equal chances for all peo-
ple to access energy and also improving energy security (IAC 2007; Steven and
Majumdar 2012; Beckett 2012).
9 Sustainable Energy: Challenges andPerspectives

180
9.6 Renewable Energy: Global Landscape
Today, the scope of renewable energy lies beyond providing the viable future energy
sources (IAC 2007). It is a tool to deal with problems caused by fossil fuel use on
environmental and human health and promote energy security, economic and social
welfare (REN21 2014). The contribution of renewable energy to global energy pro-
duction is increasing gradually. In 2015, renewable energy provided 19.3% of global
energy production with modern renewables contributing around 10%, and rest by
biomass (Fig.9.1). Out of total energy use, heat energy from modern renewable
sources contributed to 4.2%; hydropower accounted for about 3.6% and 2.4% from
other renewable sources (REN21 2017).
As per International Renewable Energy Agency’s (IRENA) estimate, the global
share of renewable energy can exceed 30% by 2030 for which technologies are
already on hand. This global share can be further enhanced by 6% by improving
energy efciency and upgrading energy access (MNRE 2009). This trend is visual-
ized through the fast growth rate of renewable installed capacity and production
during past years, predominantly in the power sector (Fig.9.2). Renewables pro-
vided 24.5% of electric power worldwide by latter part of 2016. The highest
improvement in renewable sector was found in solar energy which accounted for
almost half of the newly installed power, followed by wind and hydropower (REN21
2017). Similarly, growth rate of biofuel production, mainly for transport sector, also
picked up pace in 2013, after a slow pace from 2010 to 2012. Although biofuel
blends remain the primary focus of the policy support for alternate energy in the
Fig. 9.1 Renewable energy share of global nal energy consumption in 2016. (From REN21
2017)
S. Prasad et al.

181
transport segment, policies encouraging the exploitation of electric vehicles (EVs)
are emerging (REN21 2017).
9.7 Sustainable Energy Policies, Institutions, andPrograms
inIndia
Global policy decisions are at present being greatly inuenced by problems of envi-
ronmental pollution, energy security and climate change (Planning Commission
2003). The Public Utilities Regulatory Policy Act, 1978 forced the purchase of elec-
tricity from independent power generators at reasonable rates in the US.As a result,
by 1990s, similar rules were brought in other countries as biomass electricity pro-
duction grew substantially (Larson and Kartha 2000).
India is one country to have a separate ‘Ministry of New and Renewable Energy’
to address issues of development of renewable energy sources along with biofuels.
Of the total installed power, renewable power (14.8%) has secured the second posi-
tion after thermal (69.4%) and is spreading its wings rapidly in India (MNRE 2017).
Numerous initiatives were taken up by the Government of India in the past few
years including the idea of solar park and Green Energy Corridor concept, rooftop
solar program initiation, increase in clean environment cess, solar pump scheme,
making purchase of energy from waste to energy plants, etc. attempt has been made
to create 50,000 people trained in solar photovoltaic systems under the Surya Mitra
Fig. 9.2 Average annual growth rates of renewable energy capacity and biofuels production.
(From REN21 2014)
9 Sustainable Energy: Challenges andPerspectives

182
Scheme by March 2020. Advancing towards improved cook-stoves initiatives; com-
mencing coordinated R & D activities in solar thermal and photovoltaic systems;
second-generation biofuels, hydrogen energy, and fuel cells, etc. are the other note-
worthy schemes.
Since 1993, India has had a xed purchase price for biomass-generated electric-
ity to encourage expansion of biomass-generating capacity. A task force was consti-
tuted by MNRE leading to development of a National Programme on Biomass-based
co-generation (Shukla 2000), which recognized bagasse waste as a potential energy
resource and suggested initial thrust on bagasse co-generation in the sugar industry.
The Government of India (GOI) is enthusiastic in increasing contributions of sus-
tainable energy (resources as a low-carbon generation), undertaking necessary plan-
ning and policies to ensure the use of renewable energy in all sectors. The success
of this goal is ensured by national-level institutes such as National Institute of Solar
Energy (NISE), National Institute of Wind Energy (NIWE), and Alternate Hydro
Energy Center (AHEC) (MNRE 2014), under the government’s supervision.
Financial support for renewable energy development and improving energy ef-
ciency projects is provided by the Indian Renewable Energy Development Agency
(IREDA), also supervising the renewable energy incentive programs. Funding is
also provided by GOI and multilateral lending agencies. Ministry of Power, Planning
Commission and Prime Minister’s Council on climate change are few other govern-
ment institutions responsible for developing renewable energy (REN21 2014).
The GOI in 1981 launched a national project on biogas development. The
National Biogas and Manure Management Program (NBMMP) is implemented by
MNRE in the country. It is executed by the state nodal departments/state nodal
agencies and Khadi and Village Industries Commission (KVIC), and Biogas
Development and Training Centers (BDTCs). MNRE is also funding research proj-
ects on different aspects of hydrogen energy, geothermal energy technology devel-
opment. These projects are assisting in the development of indigenous research and
industrial base, prociency, trained workforce and models/devices/systems in the
country (MNRE 2014).
In a bid to decrease dependency on imported fuels, a notication was made by
GOI in Sept 2003 making blending of petrol with 5% ethanol compulsory initially
in 9 states and 3 union territories, which was to be extended to the whole of India
later on. In the case of biodiesel also some steps were taken such as the identication
of Jatropha curcas as the highly likely candidate for biodiesel production through
the ‘National Mission on Biodiesel, 2003’ and emphasis on wasteland plantations of
this tree-borne oilseed (MNRE 2009, 2014). Further, a ‘biodiesel purchase policy’
was brought into action in 2005 to enable oil companies to purchase biodiesel for
5% blending with diesel by the Ministry of Petroleum and Natural Gas (MOP&NG).
In another step forward, the National Biofuels Policy (NBP), 2009 was launched to
ensure prevention of debates between food and fuel and the use of only wastelands
for biofuel crop cultivation (MNRE 2009). It also gave attention to issues like
Minimum Support Prices (MSPs), subsidies for biofuel crops growers, marketing,
subsidies for the biofuel industry, mandatory blending of with ethanol and biodiesel,
testing and certication of biofuels (Planning Commission 2003; MNRE 2014).
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183
9.8 Renewable Energy Installed Capacity ofIndia
With a noteworthy growth in clean energy over the past years, our country is catch-
ing up fast on the determination to becoming a global leader in production of renew-
able energy (MNRE 2014; IRENA 2014). India has tremendous growth potential in
the energy production from different renewable sources, with a potential of about
900GW (Table9.2). Table9.3 shows India’s total renewable energy installed capac-
ity (in MW). As per MNRE reports, solar, wind, small hydropower and biomass
together contribute to 16% of total electrical installed capacity by the end of 2016
(MNRE 2017), with wind energy contributing more than half of the installed capac-
ity among renewable (GWEC 2017).
India has set a target of 16,660MW of renewable installed energy for the year
2016–2017, including solar (12,000MW), wind (4000MW), SHP (250MW), bio-
energy (400MW) and energy from waste (10MW). Other than this, solar photovol-
taic energy, cogeneration from non-bagasse biomass, energy from waste, gasication
of biomass, small wind/hybrid systems, micro hydel systems are also targeted to
produce about 100, 60, 15, 10, 1, 1MWeq. of renewable energy as off-grid energy,
along with large number of biogas plants for the same nancial year 2016–2017
(MNRE 2017). For the future, GOI also hopes to achieve establishment 100, 60, 10
and 5MW of solar, wind, biomass and small hydropower leading to reaching the
target of 175GW of clean energy by 2022, through the work of several organiza-
tions and provisions dedicated towards this goal. Advancing the national goal of the
creation of renewable energy systems not only benets ecology and environment in
the long term, but also helps to secure energy requirements, employment creation,
achieve nancial development and reduce dependency upon the exhaustible energy
resources (IRENA 2014; Kumar etal. 2015).
Table 9.2 Total renewable
energy potential from various
sources in India
Sectors Potential (in MW)
Wind Energy 102,788
Solar Energy 748,990
Small Hydro Power (SHP) 19,749
Biomass 17,538
Bagasse Cogeneration 5000
Waste to Energy 2556
Total 896,621
Source: Energy Statistics (2017), Govt. of India
9 Sustainable Energy: Challenges andPerspectives

184
9.9 Renewable andSustainable Energy Technologies:
ThePath Forward
The challenge of sustainable development can be realized through development of
renewable energy technologies (RETs) (Make in India 2015). Many scientic and
technological obstacles need to be overcome in the next 5–10years to meet the
ambitious RETs capacity addition goal and biofuel mandates for sustainable energy
supply. However, the current innovations in RETs are capable of resolving the bar-
riers of commercial production.
9.9.1 Wind Power
Among renewable energy sources, wind energy is becoming one of the essential
sources of power generation. In India, wind turbines are generally used for off-grid
mechanical power or electricity generation. The wind energy plants comprise of a
wind turbine and an electrical generator connected using a gearbox. The wind tur-
bine converts wind kinetic energy into mechanical power. It can be used for specic
tasks such as grinding grain or pumping water, or an electrical generator can convert
this mechanical power into electrical energy (Ahmad etal. 2014). The rate of wind
energy is now waning due to noteworthy advancements in wind mill technology, as
well as raise in the height of the wind towers.
Industry associations of India emphasize the high potential for wind energy from
65 to 242GW, if tower heights are kept more than 50m, energy conversion efcien-
cies are improved and necessary policy initiatives are adopted (Ramasamy et al.
2015). At a hub height of 100m, India’s wind power potential is approximated to be
302GW as per NIWE.Presently, with 31GW installed capacity in the rst quarter
of 2017 and contributing to 57% of total renewable energy, India is at the 4th posi-
tion globally, with respect to wind power (Table9.3) (MNRE 2014; GWEC 2017).
This energy is mainly generated in the states of Tamil Nadu, Maharashtra, Gujarat,
Rajasthan, and Karnataka, together supplying 94% of total wind energy generated.
The Wind Resource Assessment is led by the coastal state of Gujarat with 84.4GW
estimated potential, followed by the other states mentioned earlier (GWEC 2017).
Table 9.3 Total renewable energy installed capacity (as on 31 Dec 2016)
Renewable energy (RE) sources Power (MW) % Contribution to Installed energy
Wind Power 28700.44 57.3
Solar Power 9012.66 18.0
Small Hydro Power 4333.85 8.6
Biomass energy 7907.34 15.8
Waste to Power 114.08 0.2
Total 50068.37
Source: MNRE (2017)
S. Prasad et al.

185
To fulll the rising demand for energy, other states are also following in the foot-
steps to increase wind power production (Ahmad etal. 2014).
Installed wind power capacity of various Indian states till March 2016 is shown
in Table9.4. Tamil Nadu, the state with maximum wind energy installed, increased
its capacity from over a period of 5years from 2009, with a result of 69% increase
(Make in India 2015). Apart from the on-shore potential, India also has high off-
shore wind power potential owing to its long coastline (7600km) and wind patterns.
The states of Tamil Nadu and Gujarat will play a major role in this addition of
energy production capacity with proper planning and estimation (Ramasamy etal.
2015). Increasing the energy conversion efciencies can help elevate Indian power
position to that of the global wind energy leaders, which requires technological and
market interventions (Ramasamy etal. 2015).
9.9.2 Solar Energy
There are two techniques of using solar energy: thermal and photovoltaic way. The
thermal route employs the heat from solar energy for cooking, water heating and
purication, drying, etc. The solar photovoltaic (SPV) method transforms the light
in solar energy into electricity via the use of solar cell installed in a solar panel,
which can then be used for lighting, pumping, communications, and off-grid power
supply in un-electried areas (Indian Renewable Energy Status Report 2010). Being
a tropical country, India is bestowed with abundant number of clear sunny days,
obtaining 4–7kilowatt-hour per square meter per day radiation on an average and as
a result, shows good potential for development of solar power (Ramasamy et al.
2015). The desert state of Rajasthan receives the highest annual solar radiation in
India.
Table 9.4 Installed capacity of wind power in various states of India (as on 31 Dec 2016)
S.No. States of India
Installed capacity of wind
power (in MW) % Wind power potential used
1. Tamil Nadu 7613.86 22.53
2. Karnataka 2869.15 5.14
3. Maharashtra 4653.83 10.25
4. Rajasthan 3993.95 21.28
5. Andhra Pradesh 1431.45 3.24
6. Madhya Pradesh 2141.1 20.42
7. Gujarat 3948.61 4.68
8. Kerala 43.5 2.56
9. Telangana 77.7 1.83
10. Others 4.3 0.13
Source: MNRE (2017)
9 Sustainable Energy: Challenges andPerspectives

186
The solar energy plans are executed by the MNRE, considered one of the most
extensive programs globally. India has an assessed solar power potential of around
748,990MW, out of which the solar grid had a cumulative capacity as of October
2017 of 15.60GW (Energy statistics 2017; MNRE 2017). Increase in solar capacity
has led to decline in solar electricity rates, which has gone below that of coal based
electricity. Out of the total commissioned solar power capacity in the country as of
March 2017, the share of Andhra Pradesh is maximum, closely followed by
Rajasthan Tamil Nadu, Telangana, and Gujarat (Bridge to India 2017).
The state and central governments combined initiation of the Jawaharlal Nehru
National Solar Mission (JNNSM) in 2010, is a momentous stride towards the sup-
port of sustainable energy in India. The objectives of the mission are (i) to establish
20,000MW of grid-connected solar power (ii) to develop 20million solar lights
which will meet the target of 2000MW of off-grid power (iii) to cover an area of
20million meter squares with the solar thermal collector; by the year 2022. The tie-
up of the MNRE with IREDA aims to encourage use of solar energy and in general,
increase clean energy capacity in India, through location-specic and need-based
research, demonstrations, nancial support and in league with private sector proj-
ects (MNRE 2014; Ramasamy etal. 2015).
9.9.3 Small Hydropower (Less than 25MW)
When economic feasibility is taken into consideration, small hydro projects were
found better than other sources (Balachandar 2014). However, presently only 5% of
this source’s capacity has been exploited on a global scale, out of 150–200GW
potential as per the International Energy Agency. Another advantage is the lower
and comparable rates of this small hydropower to traditional thermal power of
around Rs 2–3/kWh, without the addition of any associated variable fuel cost (i.e.
natural gas or coal) as in thermal power (World Bank 2010). In India also, this
source can play a major role in supplying energy to remote and inaccessible regions,
carving its niche in the Indian energy sector. Small hydropower plants are catego-
rized in the following segments presented in Table9.5.
India has an estimated small hydropower (less than 25MW) potential of approx-
imately 20,000 MW out of which the collective installed capacity as of 31st
December, 2016 was 4333.85 MW counting both off-grid and grid-connected
Table 9.5 Classication of
Small Hydro Power Project
(SHP)
S.No. Category Station capacity in kW
1. Micro Hydro Up to 100
2. Mini Hydro 101–2000
3. Small Hydro 2001–25,000
Source: MNRE (2014), Annual Report, Govt. of
India
S. Prasad et al.

187
sources (MNRE 2017). Irrigation channels in plains and rivers in hilly areas are the
areas with high potential to generate this power. To successfully tap into this power,
the government has set subsidies for new installations as well as to maintain existing
hydropower plants (Indian Renewable Energy Status Report 2010). Further incen-
tives for establishment of this source is provided through loans at low interest rates
and income tax exemptions, all of which has culminated in its signicant share in
India’s electrication efforts in rural areas without access to electricity from the
central grid (Ramasamy etal. 2015; World Bank 2010).
9.9.4 Geothermal Energy
Thermal springs have drawn consideration, being the surface manifestation of the
vast resources of energy at depth in the form of geothermal reservoirs (Mittra 2011).
The geothermal energy is now better known for electricity generation. It is derived
from the Earth’s core, mantle, and crust heat, and has been helping meet both indus-
trial as well as household energy needs with great success. Geothermal energy holds
the key to solve the power problem of India. It is an ideal alternative energy resource
meeting all requirements as a clean, non-exhaustive energy (Razdan etal. 2008).
The global leader in this sector is the United States with 3.6GW installed capacity
followed by Philippines and Indonesia in 2016, with global production being a pro-
jected 78terawatt-hours (REN21 2017).
India is at the budding stages of development of geothermal energy, chiey due
to the lower rates of coal. Reports from the Geological Survey of India (GSI) reveal
the existence of about 340 hot springs, which are distributed in seven geothermal
provinces of the country (Aggarwal 2016), i.e. Himalayan (Puga, Chhumathang),
Sahara Valley, Cambay Basin, Son-Narmada-Tapi (SONATA) lineament belt, West
Coast, Godavari and Mahanadi basin. Most of them are in the low surface tempera-
ture range from 37 to 90°C, which is suitable for direct heat and power applications
(Kakkar etal. 2012). At present, the geothermal resource is tiny, but the GOI has an
ambitious plan to produce 10,000MW of geothermal energy by 2030 (Aggarwal
2016). According to International Sustainable Energy Agency, geothermal solutions
can provide not only sustainable but also economical and safe energy for all by 2050.
9.9.5 Biomass-Derived Bioenergy andBiofuels
Plants capture sunlight and carbon dioxide from the atmosphere for growth, and this
basic mechanism leads to the classication of biomass as a renewable source
(Larson and Kartha 2000). Tropical countries, like India have enormous potential
for energy generation through biomass and its residues. It is available in plenty in
the form of agricultural waste (crop residue and cattle dung, etc.), urban waste
(municipal solid waste, etc.) and industrial waste. India has about 500 million
9 Sustainable Energy: Challenges andPerspectives

188
metric tons of biomass availability annually, which can be converted to bioenergy
(by the thermo-chemical and biochemical process) or directly used as a heat and
power source (IRENA 2014).
Deploying bioenergy with carbon capture and sequestration results in a net
decline in atmospheric carbon. The vast potential of biofuels becomes more notice-
able as an alternative to the depleting fossil fuels. Moreover, they can be locally
produced, requiring very less modication before nal-use. Biomass energy also
supports rural economy, requires lesser capital investment than other renewable,
leading to lesser unit cost (Sharma and Trikha 2013).
9.9.5.1 Biomass toBioenergy by Thermo-chemical Process
The conversion of biomass to an alternative form of modern bio-energy can be
achieved primarily through thermo-chemical conversion of biomass. The end-
products of the thermo-chemical processes such as combustion, pyrolysis, and gas-
ication, include heat, electricity, or gaseous or liquid precursors which may be
modied into biofuels. With biomass serving as an energy source for more than
three-fourth of the country and producing 32% of the total primary energy use, bio-
mass occupies a central position in our energy security (Biomass Knowledge Portal
2017), with over 30,000MW estimated power production of which only a meager
8% has been exploited as yet (Schroder et al. 2008). Currently, India has over
5940MW power capacity from biomass based plants of which only 4946MW is
grid-connected (mainly from bagasse cogeneration and waste to energy plants) and
994MW off-grid power plants (mainly from non-bagasse cogeneration and biomass
gasier systems) (Biomass Knowledge Portal 2017).
Biomass energy along with other renewable, can play a major role in the planned
electrication of about 24,500 remote identied villages of India where the exten-
sion of grid electricity is not possible or very expensive (EAI report 2012; Thomas
etal. 2015). The uniform availability of biomass throughout India, particularly in
the rural areas, increases the importance of biomass as an energy source for electri-
cation. This abundant resource worth annual investments of crores of rupees with
>700billion electricity units production and also employing several people, has the
potential to form a signicant element of India’s energy mix in upcoming future
(Thomas etal. 2015).
9.9.5.1.1 Direct Combustion ofBiomass
The direct combustion of biomass has been carried out worldwide since ancient
times. Since ancient times, rewood, eld level residues and cow dung, have been a
crucial segment of energy supply and these traditional biomass still has its followers
particularly in rural areas and remote location. In complete combustion, biomass is
oxidized giving out carbon dioxide, water and heat energy (Farrell and Gopal 2008).
A popular ‘biomass combustion technology’ or the traditional cooking method in
S. Prasad et al.

189
developing countries involves burning biomass under a pot supported by three
stones. Despite its huge popularity, energy efciency of this method is very less
(15%), simultaneously exposing users to air pollutants such as methane (CH4) car-
bon monoxide (CO), particulates (PM), nitrogen oxides (NOX), and tars (Farrell and
Gopal 2008).
9.9.5.1.2 Biomass Pyrolysis
Pyrolysis is essentially the thermal breakdown of organic components in waste to
energy under inert atmospheric conditions or in limited air supply, at temperatures
ranging from 350–550°C up to 700–800°C (EAI report 2012). During the process,
the long carbon, hydrogen and oxygen compound chains break down into smaller
molecules in the form of highly heterogeneous gaseous, liquid, and solid by-
products (Jahirul etal. 2012). The pyrolysis oil, a liquid product is a heterogeneous
blend constituted of high oxygen content and resembling a very viscous tar, from
which fuels or chemicals may be produced (Fisher etal. 2002). Char is the interme-
diate solid residue which is formed in reactors during pyrolysis processes. This
residual char nds use as a fuel or soil amendment (Jahirul etal. 2012).
9.9.5.1.3 Biomass Gasication
Gasication is the efcient means of producing green power. It is incomplete oxida-
tion of biomass under controlled conditions aimed at getting peak yields of gaseous
compounds rich in carbon and hydrogen compounds such as CO, CH4, H2, CO2 and
heat (Fisher etal. 2002). These by-products are referred to as syngas or producer gas
can be used with minor changes in air inlet, to operate a diesel engine in dual fuel
mode. A drawback of this process is due to one of its condensate product ‘tar’, an
environmental pollutant, formed from high molecular weight volatiles (EAI report
2012; Fisher etal. 2002).
The gas can be put into use directly for electricity generation via a spark-ignited
gas engine incorporated with an alternator (Tanger etal. 2013). This electricity can
be used locally or off-grid or can be made on-grid, providing enough exibility for
small or large scale production for remote and difcult areas. These features also
ensure the sustainability and feasibility of biomass gasication in India.
9.9.5.2 Biomass toLiquid Biofuels by Biochemical Process
Liquid biofuels like ethanol and biodiesel are the most feasible green alternatives to
fossil fuel-based transportation fuels. Molasses, a waste product of sugar industry is
the main feedstock for bioethanol production in India, while biodiesel is made by
the transesterication of non-edible oilseeds. Indian government has brought forth
several missions and policies in support of biofuels, along with loans at lower
9 Sustainable Energy: Challenges andPerspectives

190
interest rates for establishing ethanol production plants, encouraging cultivation of
non- edible and tree-borne oilseeds and tax exemptions for biodiesel use.
9.9.5.2.1 Ethanol asBiofuel
Production of energy efcient technologies offers the world the safest and the most
environmentally benign way to sustainability. In the past few decades, great atten-
tion has been focused on the development of alternative fuel sources with particular
reference to ethanol. Raw materials containing sugars, or resources which can be
converted into sugars, can be used as fermentation feedstocks for ethanol produc-
tion (Meshram and Mohan 2007). The fermentable raw materials can be grouped
into three (a) directly fermentable sugar containing materials such as starch (b) lig-
nocellulosic biomass (c) urban/industrial organic residues. Reports are also avail-
able on direct fermentation of sugarcane, sugar beet and sweet sorghum to ethanol
(Prasad et al. 2009), which require the least costly pretreatment, where starchy,
lignocellulosic resources and other wastes need expensive pretreatment, to change
into fermentable substrates (Rao etal. 2013). However, since maintaining the food
security is given higher priority in our agrarian economy faced with rising popula-
tion pressure, it is not possible to divert a fraction of the sugary or starchy food
sources towards biofuel production.
Recently, lignocellulosic biomass, as the most abundant renewable resource has
been widely considered for ethanol production. It gives us an opportunity to look
forward to the day when all fuel needs can be met from the utilization of agricultural
residues, as it has been reported that use of currently available 74Tg of agricultural
residues across the earth could produce 16 times higher ethanol production over
present level (Prasad etal. 2007). The ethanol production potential from biomass is
high enough to replace 32% of the global petrol consumption (Meshram and Mohan
2007). With respect to India, the entire annual petrol consumption can be met by
utilizing jut one-third of available surplus biomass (Ramasamy etal. 2015).
Ethanol from biological systems is considered of particular importance because
it can be readily used as a fuel for spark ignition engines without necessitating any
modications. Ethanol contains high oxygen percent of 34.7% by weight, aiding
complete fuel burning and a marked drop in emissions. It is usually used as an addi-
tive in petrol to increase octane number, and improve the type of emissions. Ethanol,
being the low-carbon fuel, appears to have enormous potential benets to minimize
the risk of greenhouse gas emissions. It also reduces carbon monoxide emissions
and smog; usually caused due to sulfur deposits in gasoline (Kim and Dale 2004).
9.9.5.2.2 Biodiesel asBiofuel
Biodiesel is dened as ‘monoalkyl esters of long chain fatty acids obtained from
renewable lipid feedstock, such as vegetable oil or animal fat’ by the American
Society for Testing and Materials (ASTM) (Prasad etal. 2012). As the best diesel
S. Prasad et al.

191
alternate, it may be used directly or after blending. The ‘B20’ blend which consists
of biodiesel and diesel in 1:4 ratio by volume is most common. Biodiesel fuel blends
cut down emissions of particulate matter (PM), carbon monoxide (CO), hydrocar-
bon (HC) and sulfur oxides (SOx), thus less toxic to humans and environment. Also
with 80–95% lesser carbon dioxide emissions over its life cycle, biodiesel has very
little share in climate change, as compared to fossil fuels (Karmakar etal. 2010).
Substantial developmental actions have been done regarding the production and
use of biodiesel. A 1000liters/day capacity biodiesel production plant was estab-
lished by the Aatmiya Biofuels Pvt. Ltd. at Por-Vadodara, Gujarat, using jatropha
seeds as feedstock (Marina etal. 2002). Another commercial level plant with an
expandable daily biodiesel production capacity up to 100 tonnes was proposed by
Southern Online Biotechnologies (P) Ltd., in Andhra Pradesh. Lurgi Life Science
Engineering, Germany is providing the technology for this unit, along with their
Delhi-based associates (Biswas etal. 2006).
9.9.6 Hydrogen Energy
Hydrogen (H2) is a sustainable energy, which is produced from available sources
and used in every application where fossil fuels are being used. H2 is the fuel of the
future, largely due to its high conversion efciency, non-polluting nature, and recy-
clability, yielding only water after combustion (Francis etal. 2005). There are many
hydrogen production processes, including electrolysis of water, biomass gasica-
tion, and biological processes. Currently, steam reformation of methane or elec-
trolysis of water is employed almost exclusively to produce H2. Currently, H2 is
produced, almost exclusively, by steam reformation of methane or by water elec-
trolysis. Supercritical water partial oxidation, steam reforming, and gasication are
the thermo-catalytic processes employed for H2 production (Gupta etal. 2013). In
the last decade, the important problems associated with H2 economics have changed
dramatically. Nevertheless, reneries now have turned into net consumers of H2 to
cut pollution and meet environmental rules and regulations.
In India, hydrogen production from renewable resources is at the dawn of devel-
opment. The Many research projects focusing on the development of different
aspects of hydrogen production technology is being undertaken, funded by
Government of India. The Indian Institute of Science, Bangalore, is researching on
employing an open top downdraft gasication system to enhance the performance
of the oxy-steam gasication unit for hydrogen production at a rate of about 0.1kg/
kg biomass at various steam-to-biomass ratios. The National Institute of Technology,
Rourkela is working on the development of a 5kW capacity bench scale uidized
bed gasier for hydrogen production rate of about 0.09kg/kg of feedstock (Sherif
etal. 2003). The roadmap envisions initiating research and development activities in
various sectors and aspects of hydrogen energy technologies and envisaged goals of
aggregate hydrogen-based power generation capacity of 1000MW and one million
hydrogen-fuelled vehicles in the country by 2020 (Nouni 2012).
9 Sustainable Energy: Challenges andPerspectives

192
9.9.7 Biogas
Biogas production is a sustainable energy technology which not only efciently
manages and converts organic wastes into clean bioenergy but also allows the best
possibilities to cut tropospheric emissions of greenhouse gases (Kumar etal. 2010).
Biogas is produced via the anaerobic digestion of organic and bio-degradable
resources such as agricultural waste, food waste, municipal waste, sewage etc. The
slurry produced after digestion is rich in macro and micronutrients and can be used
directly as valuable organic fertilizer. Biogas is a mixture of different gases primar-
ily methane (CH4) and carbon dioxide (CO2) and may have small quantities of
hydrogen sulphide (H2S) and moisture. Methane is the only combustible constituent
of biogas (Pathak etal. 2009).On account of methane’s low specic gravity, meth-
ane biogas will rise on escaping, thus dissipating from the site of a leak which
makes it safer than other fuels like petrol and Liqueed Petroleum Gas. One cubic
meter of biogas generates 1.5kWh which is equivalent to 1lb of LPG, 0.54 L of
petrol, 0.52L of diesel and 4kWh of electricity in terms of caloric value.
Biogas nds its use both as a source of heat for cooking by direct combustion and
for mechanical or electrical power applications with internal combustion engines
(Pathak etal. 2009; Rao etal. 2010). Biogas plant helps to attain self- sufciency for
cooking gas and highly nutrient- rich organic fertilizer for households having feed
material (Horst 2000). Further, this technology can solve the problems of indoor air
pollution in households and while saving on the cost of relling of LPG cylinders.
The Government of India offers a subsidy for family type biogas plants as per the
rates are given in Table9.6.
Table 9.6 Subsidy for setting up of biogas plants under national biogas and manure management
programme
S.No.
Particulars of central nancial assistance
Family type biogas
plants size cubic meter
(M3) capacity day−1
Central subsidy rates applicable (In Rs.) 1M32–6M3
1. North Eastern Region States, Sikkim (except plain areas of
Assam) and including SC & ST Categories of NE Region
States
15,000 17,000
2. Plain areas of Assam 10,000 11,000
3. Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Niligiri
of Tamil Nadu, Sadar Kurseong & Kalimpong Sub-
Divisions of Darjeeling, Sunderbans (West Bengal) and
Andaman & Nicobar Islands
7000 11,000
4. Scheduled Castes/Scheduled Tribes of all other States except
North Eastern Region States (including Sikkim)
7000 11,000
5. All Others 5500 9000
Source: MNRE (2014), Annual Report, India
S. Prasad et al.

193
9.10 Contribution ofSustainable Energy toCDM
Despite all challenges, the clean development mechanism (CDM) saw rapid growth
in the past decade, quickly becoming the most signicant carbon offsetting mecha-
nism in the world. Currently, India accounts for approximately 4% of global green-
house gases emissions. However, on per capita basis, its emissions are only
one-fourth of the global average and less than 10% of those of most developed
nations. India has committed to reduce its economy’s emission intensity to 20–25%
below 2005 levels by 2020 and has pledged that per capita GHG emissions will not
surpass those of industrialized countries (Ngumah etal. 2013).
In 2008, NAPCC (National Action Plan on Climate Change) was launched to
promote development goals while addressing GHG mitigation and climate change
adaptation. As per NAPCC, renewable sources have the potential to meet 15% of
India’s energy demand by 2020 (Ramasamy etal. 2015). The NAPCC includes
eight dedicated missions, out of which one is devoted to solar energy (Sood etal.
2014). India is observed to be one of the most attractive Non-annexe-I countries for
CDM project development.
The Clean Development Mechanism (CDM) of the Kyoto Protocol extends sup-
porting hands for the development of renewable energy projects in India. The fun-
damental economic hurdle is the relatively higher costs of electricity generation
through Renewable Energy Technology (RET), although the scale of difference var-
ies with each technology. This price difference can be compensated to some extent
by the revenues attained from selling CERs from a CDM project (Sood etal. 2014).
9.11 Conclusion
Sustainable energy is the need of the time and it is gaining currency due to its low–
carbon generation potential, often accompanied by its co–benets. The transition of
the fossil fuel based conventional energy to sustainable energy will help in effective
management of air pollution, climate change mitigation, and spur sustainable eco-
nomic growth and improve living standards of people with equity and environmen-
tal quality. The IPCC Fifth Assessment Report validates the promising role of
bioenergy in encouraging economic development by increasing and diversifying
farm incomes and providing rural employment and in offering cheap alternatives for
mitigating climate change. There is a need to adopt and use renewable and sustain-
able energy technologies for mitigating of environmental challenges across all
sectors.
Acknowledgment Authors wish to thank Indian Agricultural Research Institute, New Delhi,
India for providing nancial support.
9 Sustainable Energy: Challenges andPerspectives

194
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9 Sustainable Energy: Challenges andPerspectives