Here’s the latest action we’re following on the GreenBeat today:

NRG, ConocoPhilips and GE create $300 million fund — Energy Technology Ventures will look to invest in early-stage technologies within the energy and cleantech fields. GE will conduct due diligence for the deals, while NRG and ConocoPhilips may also invest in demonstration projects for the startups, the Wall Street Journal reports. Three GE-backed startups have already received backing from Energy Technology Ventures: solar company Alta Devices, biofuels player CoolPlanetBioFuels and clean coal venture Ciris Energy.

Chevrolet Volt expands sales nationwide — GM’s partially-electric hybrid will be available nationwide by the end of this year. The company plans to step up production in response to high demand. So far, Volts have been delivered to customers in the Washington D.C. area, California, New York, Connecticut, New Jersey and Texas.

Zipcar adds Prius Plug-In to lineup — The popular carsharing service will add eight of the partially-electric Priuses to its offerings in Boston/Cambridge, San Francisco and Portland. The car will not be commercially available until 2012; only 160 of the cars are currently available nationwide.

Enernoc has acquired M2M — M2M Communications makes wireless technology-enabled demand response solutions, and holds hundreds of megawatts in contracts with utilities. This is one of many acquisitions Enernoc has made lately. The company is one of the top makers of demand response solutions that allow utilities to create programs that offer financial incentives when customers lower electricity use during peak hours.