The high penetration of renewable energy from variable sources such as wind and solar not only affects system operation, but also the revenue streams and investment incentives of the different market players within the area of electricity generation. Indeed, RES are inexhaustible and cheap, so that the market clearing price in continental Europe has already visibly decreased in the past few years, diminishing the profitability margin of generation companies and discouraging investments in e.g. new hydro or gas-fired power plants. On the other hand RES typically feature an increased degree of intermittency, entailing the need for more energy reserves in the system to serve as a back-up in the face of a sudden and unexpected dearth of generation, so that those same new power plants will actually become crucial because they will be required to ensure the matching of generation and demand. In order to address these conflicting aspects it is thus critical to design, develop and implement suitable market models taking into account not only the spot delivery of energy but also the provision of supplemental power capacity to guarantee the overall balance, thereby making sure that power producers are adequately remunerated and receive the proper incentives for building and operating new generation assets.