Alternative power sources have upended the electric grid. Ivan Penn, who covers the beat, discusses the changes and how he keeps track of them. https://ift.tt/2xFb2Cq The New York Times Alternative power sources have upended the electric grid. Ivan Penn, who covers the beat, discusses the changes and how he keeps track of them. https://ift.tt/2zwU7mO Alternative power sources have upended the electric grid. Ivan Penn, who covers the beat, discusses the changes and how he keeps track of them.By IVAN PENN from NYT Technology https://ift.tt/2zwU7mO
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