heat sink and  underground thermal storage

Solar thermal panels or concentrating troughs can be used to capture daytime heat for immediate power needs and the heat sink can be used for storage to act as the heat source for night generation. The efficiency is much greater in the evening when using geothermal as the heat source.

Night Generation

From Stored Solar Thermal or Geothermal

Solar thermal panels for immediate generation or to provide extra heat for night generation

Liquid to air heat exchangers provide the heat sink using cooler evening temperatures