The solar energy business is growing quickly, but future growth will not include oil giant BP.

At the IHS CERAWeek energy conference in Houston, BP's CEO made it clear the company is done with solar.

"We have thrown in the towel on solar," Bob Dudley said after delivering a wide-ranging speech Wednesday.

"Not that solar energy isn't a viable energy source, but we worked at it for 35 years, and we really never made money," he added.

BP, which announced it was winding down its solar business last year, says it is still committed to other renewable resources, such as wind power and biofuels production.

But the move away from solar is especially striking considering BP's recent history. In 2000, the company changed its logo to resemble the sun and made a big deal of its "beyond petroleum" campaign.

BP's exit from solar has more to do with a changing business than lack of will.

"The solar industry BP was involved in 10 years ago has very few similarities to the solar industry today," says Finlay Colville, vice president of the research firm NPD Solarbuzz.

Colville says BP was one of the early companies in the solar business. Back then, the market was based on a different model — one more focused on research and development. He says now the business is all about efficient production and low prices, something more suited to the Asian companies taking a lead role in the solar panel-manufacturing business; so BP's exit from solar doesn't mean the industry overall is in trouble.