From OpenStreetMap Wiki
|generator:source = solar|
|Solar power system|
|Used on these elements|
|Tools for this tag|
is a power system designed to generate electricity power by means of .
Solar park, Photovoltaic power plant
For all but the smallest solar plants, you should map the entire area as a power=plant first. This is the most important tag. You can optionally tag individual panels or groups of panels within the plant as generators:
Household solar powerplant
power=generator + generator:source=solar + generator:method=photovoltaic + generator:type=solar_photovoltaic_panel + generator:output:electricity=output rating or + generator:output:electricity=small_installation + generator:place=roof
Thermal solar power plant
Concentrated solar power system
or concentrated solar thermal power plant uses as a primary energy source the heat collected by solar concentrators.
Solar thermal collector
is a device converting sunlight to other type of energy. It converts sunlight to heat which is further used for space heating, heating of water and the like.