For the purposes of validating estimates of energy generation claimed for photovoltaic installations and allowing for the possibility of Renewable Energy Certification (REC) registration, Energy Trust of Oregon program staff has conducted an analysis of the measured output of photovoltaic systems installed through its incentive program since 2003. The AC kilowatt-hour (kWh) production of all installed systems has been logged by a mandatory revenue-grade meter and the data was solicited from the system owners by direct mail postcards sent on the one year anniversary of the installation.
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