David Sokol, the chairman of an Iowa-based utility holding company called MidAmerican Energy Holdings, which is 80 percent owned by Warren Buffett's Berkshire Hathaway, has for the most part been quieter. But Sokol and MidAmerican Energy have been positioning their business for a low-carbon future. MidAmerican's investments in wind power mean that it generates more power from renewable source than any other regulated utility, as best as I can tell. It was Sokol, at Buffett's request, who engineered MidAmerican's investment in BYD, the Chinese battery-maker and auto company that is building low-cost electric cars. (See Warren Buffett Takes Charge, my story about BYD that ran last month in FORTUNE.) And now there's more news from MidAmerican, and you heard it here first: The company will soon begin testing batteries from BYD that, if all goes well, could store electricity on a large scale at a reasonable cost.
That's a big deal.
Just a few details: This fall, MidAmerican will build a 2 megawatt storage facility using BYD batteries at an existing substation in Portland, Oregon, where it operates the local utility, Pacific Power. BYD, meanwhile, is building a bigger storage facility in China, and plans to build a third one in a still-undisclosed location on in southern California. That's about all I can tell you because BYD is reluctant to talk about its research.
The 2 megawatts of battery storage in Portland will allow MidAmerican to test BYD batteries to see how well they charge, what control systems are needed to discharge the electricity and to analyze their reliability and cost. "It will let us do a fair amount of testing to understand the economics of a 100 or 200 megawatt storage facility to back up wind," Sokol says.
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