admin /20 November, 2006
In the Honig Winery in the heart of the Napa Valley, vines heavy with grapes stretch all the way to the distant hills. But in their midst stands an odd sight – hundreds of solar panels, installed in August, gently sloping and ringed by a fence, reports The Economist (18/11/2006, p73).
No electricity bill: Already the winery’s electricity bill has dropped to zero, as the system has produced a surplus of power.
No brainer: Putting them in was "a no-brainer", says Tory Benedetti, Honig’s chief financial officer. “Any business that is a high user of electricity, how could you not consider this?"
Dramatic growth in solar installations: So far a few dozen of California’s 1,400 or so wineries have gone solar, but "it’s going to grow pretty dramatically”, predicts Barry Cinnamon of Akeena Solar, an installer.

Incentives: The state has created extraordinary incentives for businesses and homes to adopt the otherwise unaffordable system.
Subsidies and tax credits: The Honig unit, which covers a third of an acre (1,350 square metres), cost $1.2m. About $400,000 was repaid immediately as a rebate from Pacific Gas and Electric, a utility. Another 30% will be written off as a tax credit this year, thanks to the 2005 federal energy bill. Then there is another tax credit from the state.
Eight years to break even: Most wineries break even in seven or eight years on solar power units that should last for decades.
Selling surplus power to grid: This means that the wineries can sell their power to California’s grid at peak summer rates (when airconditioners are pumping), and buy it back from the grid more cheaply later.
Solar panels going up in price due to shortage of silicone: The main hurdle is cost. In just two years, solar panels have gone up in price by over 50%, says Chris Bunas of Solar-Craft, another Californian installer. That is because of a shortage of silicon, the key ingredient. New technologies, such as "thin-film" panels, could cut prices.