With Congress back in session, renewable energy proponents are girding for a battle over legislation that could make or break the nascent solar power industry.

At stake in the energy bill now before Congress is the survival of a 30 percent investment tax credit that makes large-scale solar power plants a viable option for utilities under pressure to cut greenhouse gas emissions by obtaining more of their electricity from renewable sources. On the home front, a similar tax credit for residential solar installations is up for grabs as Congress tries to reconcile House and Senate versions of the energy legislation.


“There are at least eight or nine well-funded companies that are actually making great progress in developing large-scale solar,” says Joshua Bar-Lev, vice president for regulatory affairs for Oakland, Calif.,-based solar power plant developer BrightSource Energy. “I don’t know if any of them are going to be able to finance projects and get the permits they need without these tax credits.”

The solar companies and their allies in the utility industry and on Wall Street had been pressing for an eight-year extension of the investment tax credit. They also want to abolish a prohibition on utilities from taking advantage of the incentive if they invest directly in solar power plants. But since word hit the street that Congressional leaders were considering stripping out the incentives to speed passage of the complex legislation — catchall bills that will affect the fate of nearly every energy-related industry, from Big Oil to biofuels — solar proponents have been converging on the Capitol in an 11th-hour lobbying frenzy.