Operations Inside Enel SpA's Torrevaldaliga Nord Power Station
An employee monitors coal stored in a sealed storage dome in this arranged photograph at Enel SpA's Torrevaldaliga Nord thermoelectric coal-fired power station in Civitavecchia, Italy, on Friday, Oct. 10, 2014. Italy's borrowing costs rose at a sale of three-year notes as investors await the European Central Bank's next moves. Photographer: Alessia Pierdomenico/Bloomberg via Getty ImagesPhotograph by Alessia Pierdomenico — Getty Images

    We expect revolutions to be led by tiny upstarts, not established giants. But Enel, Italy’s $101 billion-in-revenues utility—No. 69 on the Global 500—is charging the barricades when it comes to clean power. Last year it generated 38% of its total output from renewable sources, including wind, solar, and geothermal energy. CEO Francesco Starace says that figure will be 48% in four years, and he has committed to making Enel—whose fastest-growing subsidiary is Green Power, which had $3.9 billion in revenues last year—carbon-neutral by 2050.

    Company Info

    Revenues ($ millions)100,539
    Company typePublic
    CEOFrancesco Starace
    Impact SegmentEnvironmental Impact

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