This is an interesting approach to optaining very high penetration of renewables such as photovoltaics and wind.  At present most large installations operate under Power Purchase Agreements (PPA) wherein the economics are based on a sell all output at predetermined prices. This contrasts with standalone systems wherein the system size is based on meeting the load requirements all year.  This means that when output exceeds the load requirements, the output of the system is simply reduced and potential production lost.

A radical idea to get a high-renewable electric grid: Build way more solar and wind than needed