Global production of solar photovoltaic (PV) cells increased 51 percent in 2007, to 3,733 megawatts, according to the latest Vital Signs Update from the Worldwatch Institute, produced in collaboration with the Prometheus Institute in Cambridge, Massachusetts. More than 2,935 megawatts (MW) of solar modules were installed in 2007, according to early estimates, bringing cumulative global installations of PVs since 1996 to more than 9,740 MW-enough to meet the annual electricity demand of more than
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