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

SoloPower picks up $51.6 million — The thin-film solar startup  (solar module pictured) has raised the cash from backers that include Hudson Clean Energy Partners and Crosslink Capital, according to an SEC filing cited by Earth2Tech, which also notes solar manufacturer Stion is looking to raise $100 – $150 million in an IPO in the next few years.

Nvidia Tegra chips to power Tesla’s Model S — Tesla announced it will use two Nvidia Tegra chips to power the 17-inch touch screen on its 2012 all-electric Model S. Earth2Tech notes the display will be the largest ever in a car and will have 3-D graphics. The  chips have the plus of being energy efficient, which is key for electric cars that run solely on battery.

Ethanol unable to meet renewable fuel mandate — The U.S. doesn’t have the infrastructure to meet the federal mandate for renewable fuel use with ethanol, according to a Purdue University study. Instead, the study suggests the standard could be met by ramping up production of cellulosic and next-generation biofuels.

Bloom Box costs $12.50 per watt — The price for a Bloom Energy’s powerful fuel cell mini-power plant Bloom Box is $12.50 per watt after warranty, installation, shipping and sales tax Greentech Media reports. The article cites an anonymous source to challenge Bloom’s claims that the box — which it claims can power up to TK American homes — generates electricity for nine to 11 cents per kilowatt hour after incentives.

Biofuels microbe company Qteros raises $22 million — The money is considered the initial phase of a third round of financing. The company also announced a developmental deal with Indian bio-ethanol engineering and equipment company Praj. The two will collaborate to produce process design packages that make use of Qteros’s microbe and Praj’s engineering expertise.