Linked from
The 13 pages that link to Solar thermal energy, each with the reason it gives.
Solar irradianceRelated: Solar irradiance determines the heat a collector can capture.
Energy storageRelated: Thermal stores can retain collected solar heat for use after sunlight fades.
Stirling engineRelated: Concentrated sunlight can supply the engine’s hot-side heat input.
SunlightRelated: Collectors can concentrate or absorb sunlight to heat water and buildings.