Juha Kiviluoma

Juha Kiviluoma
VTT Technical Research Centre of Finland | vtt · Energy Systems

PhD

About

126
Publications
46,828
Reads
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2,679
Citations
Additional affiliations
September 2016 - present
University College Dublin
Position
  • Researcher
October 2003 - June 2020
VTT Technical Research Centre of Finland
Position
  • Senior Researcher
Education
June 2004 - September 2013
Aalto University
Field of study
  • Engineering Physics, Advanced Energy Systems

Publications

Publications (126)
Thesis
Full-text available
Variability and uncertainty of wind power generation increase the cost of maintaining the short-term energy balance in power systems. As the share of wind power grows, this cost becomes increasingly important. This thesis examines different options to mitigate such cost increases. More detailed analysis is performed on three of these: flexibility o...
Chapter
Finland, in line with its Nordic neighbours, has set itself ambitious goals to achieve carbon neutrality. By the late 2010s, the idea of a full-scale energy transition was mainstreamed in Finnish society alongside the expectation of renewable energy being the main production component in the Finnish energy system. In this chapter, we argue that an...
Article
Full-text available
Power-to-gas technology has been proposed as one component for future energy systems facing decarbonization targets. This paper presents a power-togas focused open optimization model for studying cost efficient design and operation of future urban energy system. The model is able to distinguish the benefits of different configurations of power-toga...
Article
Full-text available
The Spine Toolbox is open-source software for defining, managing, simulating and optimising energy system models. It gives the user the ability to collect, create, organise, and validate model input data, execute a model with selected data and finally archive and visualise results/output data. Spine Toolbox has been designed and developed to suppor...
Article
Full-text available
The transition towards more sustainable energy systems poses new requirements on energy system models. New challenges include representing more uncertainties, including short-term detail in long-term planning models, allowing for more integration across energy sectors, and dealing with increased model complexities. SpineOpt is a flexible, open-sour...
Article
Full-text available
Most of the power-to-heat and thermal energy storage technologies are mature and impact the European energy transition. However, detailed models of these technologies are usually very complex, making it challenging to implement them in large-scale energy models, where simplicity, e.g., linearity and appropriate accuracy, are desirable due to comput...
Preprint
Full-text available
Energy storage models require binary variables to correctly model reserves and to ensure that the storage cannot charge and discharge simultaneously. This paper proposes a tight linear program (LP), i.e., convex hull, for the storage, which guarantees that there is no better LP approximation to its mixed-integer program (MIP) counterpart. Although...
Article
Electrification of the energy end-use sectors looks inevitable because carbon-free energy sources tend to produce electricity as opposed to heat or other energy carriers. At the same time, sufficient flexibility will not be guaranteed and requires appropriate policies, legislation, and market regulation as well as participation from energy consumer...
Article
Disruptions in electricity supply can cause significant social and economic damages to individual customers connected to the electricity grid, causing loss of income, productivity, and material damages. In this context, considerable investments are required for improving the reliability of the electricity network, and appropriate methods are needed...
Article
In the next ten years, the Baltic countries ― Estonia, Latvia, and Lithuania ― are planning large investments in renewable power generation and transfer capacity, substantial phase-out of fossil-based power generation, and desynchronization from the Russian electricity grid. In this article, the operational impacts of these changes on the Baltic en...
Article
Abstract As power systems evolve towards integrating higher shares of renewables, the demand for additional levels of flexibility is increased. Meanwhile, o‐ther energy consuming sectors, such as transport and heating, could provide flexibility when they move from fossil fuels to electricity. In this paper, the impact of a range of flexibility meas...
Book
Full-text available
This report summarises findings on wind integration from the 17 countries or sponsors participating in the International Energy Agency Wind Technology Collaboration Programme (IEA Wind TCP) Task 25 from 2006–2020. Both real experience and studies are reported. Many wind integration studies incorporate solar energy, and most of the results discussed...
Chapter
Policy-makers throughout the world face the question of how to accelerate the production of renewable energy. Of the various resources, wind and solar energy are more or less globally available. Hence a key question concerns a suitable mix of policy instruments to accelerate the deployment of wind and solar power. This raises questions of their lar...
Chapter
The electrification of other energy sectors is a viable pathway towards a climate neutral energy system. This chapter analyses electrification scenarios for 2030 and 2050 in the Nordic countries. The scenarios for 2030 consist of three tiers of electrification in industry, transportation and heating. The scenario for 2050 highlights a high level of...
Preprint
Full-text available
Most of the power-to-heat and thermal energy storage technologies are mature and already impact the European energy transition. However, detailed models of these technologies are usually very complex, making it challenging to implement them in large-scale energy models, where simplicity, e.g., linearity and appropriate accuracy, are desirable due t...
Article
Full-text available
Planning of future energy systems with higher prevalence of wind and solar energy requires a careful representation of the temporal and operational characteristics of the system in the investment planning model. This study aims to identify the aspects that should be considered when selecting the representation for a particular system. To demonstrat...
Article
We combine previously separate models of Northern European power markets, local district heating and cooling (DHC¹) systems, and biomass supply in a single modelling framework to study local and system level impacts of bioenergy technologies in phasing out fossil fuels from a DHC system of the Finnish capital. We model multiple future scenarios and...
Article
Driven by climate change concerns, Europe has taken significant initiatives toward the decarbonization of its energy system. The European Commission (EC) has set targets for 2030 to achieve at least 40% reduction in greenhouse gas emissions with respect to the 1990 baseline level and cover at least 32% of the total energy consumption in the Europea...
Chapter
The trends of electrification, decentralization and digitalization underpin the transition of energy systems towards climate neutrality. These trends also create a new need for greater flexibility as situations of peak demand and excess production become acute and matching demand and supply more challenging. The required flexibility can be addresse...
Article
The authors are founding team members of a new effort to develop an Open Energy Outlook for the United States. The effort aims to apply best practices of policy-focused energy system modeling, ensure transparency, build a networked community, and work toward a common purpose: examining possible US energy system futures to inform energy and climate...
Article
Full-text available
In power and energy system planning tools, the temporal detail is often reduced by selecting representative slices out of longer time series. Various methods exist for the selection task, but they may prove slow or otherwise unfavourable in practical applications. Here, a generalized clustering algorithm, referred to as regular decomposition, is pr...
Article
Full-text available
The demand for low carbon energy calls for close to 100% renewable power systems, with decarbonization of other energy sectors adding to the anticipated paradigm shift. Rising levels of variable inverter-based renewable energy sources (VIBRES) are prompting questions about how such systems will be planned and operated when variable renewable genera...
Article
Rapidly increasing levels of variable inverter‐based renewable energy sources are quickly changing electric power systems and prompting questions about how the systems will be operated when renewable generation becomes the dominant technologies. In this article, we review the status of this shifting paradigm in power systems throughout the world. W...
Article
Full-text available
One of the most promising ways of de-carbonising the energy sector is through increasing the amounts of variable renewable energy (VRE) generation in power systems. While the inherent uncertainty of VRE is a challenge, it can be mitigated through improved forecasting and energy system modelling. Typically, stochastic energy system studies have focu...
Article
Full-text available
The integration of renewable energy sources, including wind power, in the adequacy assessment of electricity generation capacity becomes increasingly important as renewable energy generation increases in volume and replaces conventional power plants. The contribution of wind power to cover the electricity demand is less certain than conventional po...
Article
Full-text available
Backbone represents a highly adaptable energy systems modelling framework, which can be utilised to create models for studying the design and operation of energy systems, both from investment planning and scheduling perspectives. It includes a wide range of features and constraints, such as stochastic parameters, multiple reserve products, energy s...
Article
Full-text available
In order to achieve significant greenhouse gas emission reductions, decarbonisation of all economic sectors must be considered. Here we study the provision of renewable energy for the power, district heating, transport and industrial sectors in North European countries by integrating a large amount of wind and solar power into the system with power...
Article
In the past, power system planning was based on meeting the load duration curve at minimum cost. The increasing share of variable generation (VG) makes operational constraints more important in the planning problem, and there is more and more interest in considering aspects such as sufficient ramping capability, sufficient reserve procurement, powe...
Chapter
In order to effectively utilize hydro production flexibility, a sufficient amount of transmission capacity has to be available between the hydro‐dominated part of the system and the part that requires operational flexibility. This chapter starts with a rough categorization of “base” hydropower flexibility, investigating the types of hydropower plan...
Chapter
This chapter describes some of the recent research into the capacity value of wind power. It builds on previous reviews from IEEE and International Energy Agency (IEA) Wind Task 25, and examines recent work that evaluates the impact of multiple‐year data sets and the impact of interconnected systems on resource adequacy. The chapter provides exampl...
Article
Full-text available
Integrating ever-increasing amounts of variable renewable energy (VRE) into the power system could benefit from harnessing widespread residential demand-side management. This paper presents case studies on the potential benefits of power-to-heat (P2H) flexibility and energy efficiency improvements in a hypothetical future Finnish detached housing s...
Technical Report
Full-text available
Part II of the report aims to explain the methodology behind the FlexTool
Technical Report
Full-text available
To transform our energy system towards one dominated by renewable energy, flexibility has to be harnessed in all parts of the power system. Power system flexibility spans from more flexible generation to stronger transmission and distribution systems, more storage and more flexible demand. Production of heat and synthetic gas (e. g., hydrogen) from...
Technical Report
Full-text available
Many individual wind and solar integration studies have been conducted in the past. The integration studies have evolved towards looking at the integration of wind and solar at the same time. Integration studies typically simulate a future power system with wind and solar contributions (share or penetration) varying from 5% to more than 50% of annu...
Conference Paper
Full-text available
Generation capacity adequacy is a major issue in most power systems, but there are many approaches which can be assessed. Power system planners often define target values for the capacity adequacy, which may be achieved through capacity markets/auctions, capacity reserves, or capacity purchases. Wind power contributes to the generation capacity ade...
Article
Power-to-gas and other chemicals-based storages are often suggested for energy systems with high shares of variable renewable energy. Here we study the North European power and district heat system with alternative long-term storage, the power-to-ammonia (P2A) technology. Assuming fully renewable power and heat sectors and large-scale electrificati...
Article
Full-text available
Wind power potential estimates are relevant for decision making in energy policy and business. Those estimates are affected by several uncertain assumptions, most significantly related to wind turbine technology and land use. Here, we calculate the technical and economic onshore wind power potentials with the aim to evaluate the impact of those ass...
Technical Report
Full-text available
Realising Value from Electricity Markets with Local Smart Electric Thermal Storage Technology (RealValue): The purpose of this report is to present the findings of Task 3.6 “Perform Cost Benefit Analysis of SETS and Alternative Local Small-Scale Storage Options”. Using the techno-economic models developed in Tasks 3.2 – 3.5, and the various system...
Article
As the penetration rates of variable renewable energy increase, the value of power systems operation flexibility technology options, such as renewable energy forecasting improvements and electricity storage, is also assumed to increase. In this work, we examine the value of these two technologies, when used independently and concurrently, for two r...
Article
Grid codes are technical specifications that define the requirements for any facility connected to electricity grids. Wind power plants are increasingly facing system stability support requirements similar to conventional power stations, which is to some extent unavoidable, as the share of wind power in the generation mix is growing. The adaptation...
Article
Full-text available
This paper presents the potential role of thermal power generation in a future power system with high shares of variable generation while considering different sources of demand side flexibility such as heat pumps and heat storages in district heating, demand response from industries and electric vehicles. The study was carried out using a generati...
Technical Report
Full-text available
Neo-Carbon Energy is the largest renewable energy research in the Finnish history. We are creating a completely new energy system where the produced energy is emission-free, cost-effective and independent. We are solving renewable energy’s flexible use, storage and distribution. This will revolutionise the entire energy field. The project is carrie...
Preprint
Ammonia has been suggested as an energy vector which has enable energy storage and sector coupling in order to balance the variability of wind and solar power. This paper investigates the impact of the power-to-ammonia technology in the North European power and heat system. Three-stage model was built for the power-to-ammonia plant. A cost optimiza...
Conference Paper
Full-text available
Increasing penetration of variable generation in the Nordic energy system and possible future reduction in nuclear power will decrease the power system inertia, which may lead to stability problems in case of a sudden generation loss. In this study, the focus was on a nearly 100 % renewable power and district heat sectors. We used a unit commitment...
Preprint
Ammonia has been suggested as an energy vector which has enable energy storage and sector coupling in order to balance the variability of wind and solar power. This paper investigates the impact of the power-to-ammonia technology in the North European power and heat system. Three-stage model was built for the power-to-ammonia plant. A cost optimiza...
Preprint
In order to achieve significant emission reductions, decarbonisation of all economic sectors must be considered. Here we study the provision of renewable energy for the power, district heating, transport and industrial sectors in North European countries by integrating a large amount of wind and solar power into the system with power-togas and powe...
Conference Paper
Full-text available
A significant number of wind and solar integration studies have been conducted in recent years, and methodologies have evolved steadily. Since power system characteristics and data availability vary significantly, the results and methodologies used in these studies have varied accordingly. This article presents findings from an international collab...
Chapter
Bioenergy is currently the major source of renewable energy in the world, when considering heat power and also transport fuels, while wind and solar are fast growing alternatives [2]. The role of wind and solar in electricity production is rapidly increasing, but the integration of these intermittent, variable, and uncertain electric energy sources...
Article
Full-text available
As the share of variable generation in power systems increases, there is increasing value in more flexible use and generation of electricity. The paper compares the economic value of several flexibility options in a large power system with a large amount of reservoir hydro power. Generation planning models are needed to consider the impact of flexi...
Article
Power systems require a certain amount of flexibility to meet varying demand and to be able to cope with unexpected events, and this requirement is expected to increase with the emergence of variable power generation. In this paper, we focus on gas engine power plant technology and the beneficial influence its flexible operation can have on a power...
Article
In the future energy system, it is likely that there is more variation in the electricity prices due to higher share of renewable energy sources in electricity production. In this paper, the effects of more variable electricity prices were analyzed in a district heating (DH) system that includes both combined heat and power (CHP) plant, fired mainl...
Article
As has been often reported, electricity systems with high levels of variable wind and solar power generation would benefit from demand flexibility. What is not as often mentioned is that electrification of the transport and heat sectors could exacerbate the need for flexibility, if they are implemented as inflexible loads. This demand could also be...
Technical Report
Full-text available
Low carbon energy targets and policy are driving renewable energy to markets. Widespread solar and wind electricity penetration of the energy system drives market change. Electrification and price formation change the role of energy consumables and distribution grids, further driving the change in earning logic that will eventually create new busin...
Conference Paper
Full-text available
Power-to-gas technology (P2G), which produces synthetic natural gas (SNG), has been proposed as one way to overcome the variability of variable generation. Its advantage is the almost unlimited storage capacity but it is encumbered by low efficiency. In this study, the capacity investments in power and heat generation until 2050 and the hourly oper...
Article
This article describes some of the recent research into the capacity value of wind power. With the worldwide increase in wind power during the past several years, there is increasing interest and significance regarding its capacity value because this has a direct influence on the amount of other (nonwind) capacity that is needed. We build on previo...