The best replacement for solar energy is fossil fuels.

The best alternatives to solar energy are rated as following:
★★★★★  fossil fuels
★★★★★  wind energy
★★★  electricity
★★  nuclear energy
★★  coal
★★  nuclear
★  solar power
★  conventional energy
★  petroleum
★  geothermal energy
★  biomass
  thermal energy
  wind power
  electrical energy
  electric energy
  fossil fuel
  geothermal
  fossil fuels cost
  disadvantages
  internal energy
  depend on fossil fuel
  traditional energy
  gas energy

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Google Trends

Scale is based on the average worldwide traffic of solar energy in all years. Click on graph for more.
solar energy
fossil fuels
wind energy