The main sources are hydro-electric, natural gas and oil.
The main sources of energy in Canada are oil, hydroelectricity, and solar power.
The main energy source is the sun
solar, wind, geothermal
Uselessness
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Obviously. Norway has loads of natural sources of energy, waterfalls and rivers mostly. No, Norwegians do not live in the utter dark with candles.
The main sources of chemical energy are compounds. Some of the common energy sources include gas, food, oil and so many more.
Coal and uranium
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sun
The Sun
Coal, oil, and natural gas are the main three nonrenewable primary energy sources.