Various forms of it too. The world runs on solar energy, nuclear energy, geothermal energy, hydro energy (hydroelectricity), fossil fuels, wind, and more. If we didn't have all of these energy sources, you wouldn't be viewing this webpage, and you wouldn't be enjoying the quality of life you enjoy today.
Fossil fuels are a thing of the past. Given enough time, Earth will run out of such resources. This means that we will inevitably run out of fossil fuels to produce electricity, in the near future. So, it's best to do something now (start switching to renewable & sustainable energy), than to act at the last minute.
Solar energy is renewable, simple, and effective. It is one of the most popular renewable energy sources & can be used almost anywhere.
H2 is the most abundant gas in the universe, so we can pretty much find it anywhere. With hydrogen and oxygen burned together comes energy.