Creating markets to trade grid support services (GSS) can also provide revenue streams for generators, the REserviceS project found.

The project as well as EWEA has the European Photovoltaic Industry Association (EPIA) and Germany's Fraunhofer IWES institute as partners, as well as renewables companies such as Acciona and SMA.

"This project confirms that not only can variable renewables contribute to system reliability, but under market-based approaches, wind and solar PV can also reduce system operation costs," says Ivan Pineda, head of policy analysis at EWEA.

"Grid