The best replacement for solar is wind.

The best alternatives to solar are rated as following:
★★★★★  wind
★★★★★  lunar eclipse
★★★  wind power
★★  geothermal
★★  nuclear
★★  wind energy
★★  acrylic nails
★★  lunar calendar
★  coal
★  nuclear energy
★  electricity
★  gel nails
★  generator
★  electric attic fans
★  photovoltaic
  low voltage lighting
  sidereal
  fossil fuels
  gas pool heater
  low voltage
  hydro
  geothermal which is better
  heat pump
  electric pool heater
  electric water heaters
  power attic fans
  kinetic
  lunar
  electric attic fan
  eco drive
  kinetic watch
  electric power

Your alternative for solar is not listed? Suggest!
Speaking about solar, one probably shouldn't forget about battery backup.

Other search terms related to solar and their ratings are:
★★★★★ battery backup
★★★★ generator backup
★★★ geothermal
★★ combi boiler
★★ wind turbine
★★ wind energy
★ inverter system
★ battery bank
★ smart meter
★ tankless water heater
grid
agl
wind power
pg&e
charge controller
You have in mind a companion for solar and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of solar in all years. Click on graph for more.
solar
wind
lunar eclipse