About 180 MW of peaking power is expected to go on line in mid-to-late July, according to Southern California Edison. The four 45 MW plants are set to start testing for 300 hours and could be dispatched during that time by the California Independent System Operator if necessary, said Mark Nelson, Edison director of generation, planning and strategy. The 180 MW are short of the 600 MW California Public Utilities Commission president Mike Peevey ordered the utility to build last August for summer 2007 (Circuit, Aug. 18, 2006). \u201cThese are \u2018black start\u2019 units,\u201d Nelson explained. They can be used when the grid is down during blackout, or can be \u201cused like a match\u201d to start another unit on the system, as well as for voltage support. The four units are scattered through the utility\u2019s territory. Two are in the ever-growing Inland Empire\u2014one in Ontario, another in Rancho Cucamonga. The other two are located in Norwalk and Stanton. A fifth peaker is aimed for Oxnard, but local officials have yet to approve it.