Solar may be on the verge of claiming its next victim in the fight against super-cheap energy sources that are slowly killing the planet: natural gas. “By 2023, we think solar’s going to be cheaper than gas almost everywhere around the world,” Tom Heggarty, a senior solar analyst for Wood Mackenzie Power and Renewables, said Tuesday during the first day of GreenTechMedia’s Solar Summit in Scottsdale, Arizona.

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