For the past two years, the Southeastern Pennsylvania Transit Authority has been capturing its braking energy and then selling it back into the power grid. SEPTA’s initial project has been successful enough that it is launching into a second phase, with future expansions already being planned. Other electric modes of transportation, such as electric cars and trucks, are also participating in frequency regulation markets in PJM and ERCOT.
ABB, Viridity Energy, Saft Battery, and Maxwell are providing SEPTA with storage to gather brake energy and sell it into the PJM frequency regulation market. Frequency regulation has always been needed to balance grid fluctuations, but in areas with high penetration of intermittent renewables, faster response times are becoming more important.
Source: http://electricalcontractor.com/?p=12877
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