See: http://www.renewableenergyworld.com/rea/news/article/2014/02/beech-ridge-energy-plans-battery-system-at-west-virginia-wind-farm
Summary stats for the battery: 32 MW 18 modules made of standard shipping containers (like Rossi's MW gadget), each with 1.8 MW output. Lithium-ion batteries Cost $20 million. Whew! "Each 1.8-MW module includes: one standard shipping container housing four battery strings; four 450 kW inverters to convert power between direct current and alternating current; a chiller to cool the battery containers; and a transformer for the inverter." It sounds like a kudge, but I guess it is the best we can do with today's technology. Pumped water storage seems more elegant with higher capacity. I suppose it is not as efficient. - Jed
