There are now 434 companies registered to install solar systems by the California Energy Commission, which installed just under 50 megawatts of solar electric generating capacity in 2006 (the most in a single year.) As reported in a January, 2007 article in The New York Times, the shift began in earnest
Unlike the do-it-yourself tinkerers who once comprised much of the home photovoltaic market, current buyers are interested in basic service from companies like NextEnergy. This firm supplies homeowners with a package that includes system design, permit applications, rebate processing, installation, maintenance and warranty. Power companies are legally required to credit their customers for the excess power they produce. At the end of the year, credits for solar power added to the grid are applied against charges for power taken from it, "helping homeowners zero out their electricity bills," adds The Times.