Frustrated with political deadlock, solar energy companies fear a big setback if Congress fails to renew a key federal tax credit set to expire at the end of the year.

The provision would extend a 30 percent break of up to $2,000 to homeowners. Businesses would qualify for the same percentage, without a cap.

While the U.S. House of Representatives has passed a bill to extend the tax credit, the effort so far has failed eight times in the Senate--the latest defeat occurring on July 30.

For further information: CNET