Linked from
The 11 pages that link to Solar energy, each with the reason it gives.
SunRelated: Photovoltaic and thermal systems turn the Sun’s radiation into usable power.
Day lengthRelated: Day length affects the daily window available for solar power generation.
Solar radiationRelated: It turns incoming solar radiation into a human energy resource.
DaytimeRelated: Solar panels generally generate most power while the Sun is above the horizon.