Toyota will install solar panels on some Prius hybrids in its next design release, responding to growing demand for “green” cars amid record-high oil prices,. The panels, supplied by Kyocera Corp would be able to power part of the air-conditioning on high-end versions of the gasoline-electric Prius, the source said.

“It’s more of a symbolic gesture,” said the source, who asked not to be identified. “It’s very difficult to power much more than that with solar energy.”

Toyota is due to launch the third-generation Prius next year.

Big automakers are all racing to come up with alternative solutions to using fossil fuels to appear ecologically conscious and to lure consumers looking to save money at the pump.

But solar power is not seen as a viable solution to power cars. Solar panels are expensive due to rising silicon prices and storing energy is difficult, the source said. It was unknown how much the solar panels on the new Prius cars would cost, or how many solar-mounted versions Toyota would build.

Toyota has struggled to keep up with demand for the Prius as soaring gasoline prices put consumers off of gas-guzzling sport utility vehicles and pickup trucks. Rival Honda Motor Co will also step up its hybrid push with a new, low-cost model early next year, followed by several other gasoline-electric cars.

Automakers have teamed up with battery makers to develop and produce lithium-ion batteries to store more energy in smaller packages to extend cruising distances.