Portland, OR, & Oakland, CA — Solar power, biofuels and biomaterials continue to hold the best cleantech job opportunities in the U.S. with the San Francisco Bay Area and Silicon Valley again topping the list of 15 metro areas in the country with the greatest job activity, according to a new study from Clean Edge.

The firm released its "Clean Tech Job Trends 2010" this morning. Clean Edge's second annual look at the state of cleantech jobs in the U.S. and around the world is replete with data on the sectors and regions that hold the most promise for cleantech employment, salaries for cleantech jobs, manufacturing trends and resources for jobseekers and others who want to know more about the industry.

The report was authored by Clean Edge co-founder and Managing Director Ron Pernick, Senior Editor Clint Wilder and Trevor Winnie, research and marketing associate for the firm.  (Full disclosure: Greener World Media Chairman and Executive Editor Joel Makower also is a Clean Edge co-founder.)

Although the Great Recession has been officially declared as being over, "the global economy continues to be in historically dire shape," the report said, adding that now more than ever "the clean energy sector is delivering new job and economic opportunities, as it moves from a once-marginalized niche to an increasingly cost-competitive, mainstream offering."

"There are many challenges facing the sector," the report acknowledged, "but clean energy and more broadly, cleantech, offer some of the largest growth opportunities on the global economic horizon. Green jobs can pay well and span the spectrum from "green-collar" trade jobs to Ph.D.-level engineers."

Citing data that the total jobs in industries related to renewable energy exceeded 3 million globally in 2009, the report said that the top four cleantech job sectors overall are energy, transportation, water and materials. In the U.S., the top five sectors are solar power, biofuels and biomaterials, smart grid and energy efficiency, wind power and advanced tranportation and vehicles.

For a second year, the greater San Francisco-Oakland-San Jose metro area leads the U.S. regions with the most job activity. California's Los Angeles to Riverside corridor is in second place with New England's Boston-Cambridge-Quincy metro area in third.

Four California regions made it onto the U.S. list of the top 15 hot areas for cleantech jobs. The report noted, however, "The Golden State faces an uncertain cleantech future if the state's voters pass a November ballot measure, Proposition 23, that would suspend the state's landmark greenhouse gas reduction laws."

Globally, China dominated a list of top cleantech pure-play employers with six companies in the report's Top 10 roster in this category. The U.S. came in a distant second with two firms.

"China has risen from clean energy neophyte to global clean energy powerhouse over the past five years," Pernick said in a statement announcing the report. "China has become the country to watch, analyze, and, at times, emulate. Ignoring China's cleantech ambitions and activities puts one's own cleantech initiatives at great peril."

Next Page: Cleantech job salaries.