New investment activity is appearing in an industry that’s often overlooked and misunderstood.

Audi debuts models with new plug-in hybrid technology and innovates with cars that run on synthetic natural gas.

The military’s adoption of cleantech on the battlefield is creating opportunities for private partners, say top officials.

Costs are down and opportunities abound. So where’s the boom?

The productivity of the U.S. economy is more tied to energy efficiency upgrades than an increase in energy supply, according to a new ACEEE analysis, which analyzed the $574 billion spent on such upgrades in 2010, an 80% increase over the amount spent in 2004. View Article

Private equity interest in India's energy sector has shifted toward clean energy projects from conventional power as the country faces its worst fuel shortages.

Canada's $2 billion SD Tech Fund invested in twenty-three cleantech start-ups, with the goal of making Canada a global cleantech powerhouse.

Car makers go solar; DOE, EPA chief nominees named; new tariffs for Chinese solar; shareholders push clean energy policies at major U.S. corporations.

Top news stories in clean energy this week.

Clean energy investors hope master limited partnerships may alleviate the project financing bottleneck.