Lowe plays a junior senator from California on ABC's "Brothers & Sisters." He testified before a special House panel looking at energy and global warming issues. Later, he appeared at a demonstration about three blocks from the Capitol featuring a Toyota Prius that had been converted to a plug-in hybrid.
Lowe said his interest in clean energy was not new. Recent events, he said, led him to become more active on the issue.
"The first money I ever made and was able to invest, I invested in an alternative energy company going back 25 years," he said. "Like a lot of Americans, I've been watching as the climate changes and as we are in a war on terror where our oil addiction helps fund people that want to kill us. It's gotten my attention."
Photos: The Greening Of Hollywood
He promoted plug-in hybrids, which have both electric and gasoline motors, plus a battery pack that can be recharged at home.
"I have been driving this car around and I have to tell you, it did what my mother couldn't do. It did what my driving instructor couldn't do it's made me a better driver," Lowe said.