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The era of ever-cheaper clean power is over, giving a fresh jolt of uncertainty to global energy markets battered by one supply crisis after another.

Relentless price declines over the past decade made renewables the cheapest sources of electricity in much of the world. In the past year, though, prices for solar panels have surged more than 50%. Wind turbines are up 13%, and battery prices are rising for the first time ever.

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