So a system using both might cost less than $1 million.

The system will cost about $120 million to put in place.

The system, described as the largest ever built, cost $400,000.

The agency said the new system could not be ready before 2009 and would cost too much.

A 10-kilowatt system, enough to power a large house, costs about $7,700.

Similar systems cost twice that much just a year ago.

"For larger families, the system would cost $185 a month."

The system cost $250 million and has been working since May 2009.

The present system simply costs the general public too much.

The system costs $5,000 but does not include a camera.