This article aims to assess and understand the impact of large-scale integration of the solar photovoltaic (PV) technology in the Iberian electricity market. This impact was evaluated using the projections of the Portuguese solar deployment capacity established in the National Energy and Climate Plan (NECP) 2030 and a multi-agent electricity market simulator designated as MATREM (for Multi-Agent Trading in Electricity Market). Comparing with the values obtained for 2016, the results suggest that the installed capacities projected in the PNEC allow to reduce the average price on the day-ahead spot market by 8.10 €/MWh, reaching 45.52 €/MWh. Considering only the period when solar production is expected (i.e., excluding the night hours), the average price obtained for 2030 is 46.76 €/MWh. With the current installations costs values of solar PV and the values obtained in this work, the results suggest that it is reasonable for a solar power producer to select a market-based remuneration. Thus, in addition to the environmental benefits, the large-scale integration of solar PV technology can have a positive socio-economic impact.