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Schematics of Centralized versus Distributed Power Systems. Source: Reicher, Dan W., Assistant Secretary for Energy Efficiency and Renewable Energy. Testimony Before the Committee on Energy and Natural Resources. U.S. Senate Hearing on Distributed Power Generation, 22 June 1999. In OPA. 2006. Discussion Paper #4: Supply Resources. November. http://www.powerauthority.on.ca/ipsp/Page.asp?PageID=924&ContentID=4049