One day, rooftop and other powerful solar might generate sufficient electricity to power our homes, apartments, and businesses.

One day, batteries will likely capture and store this energy at a level that reduces the need for transmission across long distances.

Who knows? Maybe one day, small modular (nuclear) reactors and those using alternative coolants like liquid sodium will even win friends.

Until that day, however, most electricity will be generated by utilities using natural gas (mostly in the developed world) and coal (elsewhere).

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