In Geothermal, Richard T. Stuebi at Cleantech Blog told us about geothermal heat pumps, the forgotten one. Matthew McDermott at TreeHugger informed us that Ormat had bought exploration rights on an Alaskan volcano. In Solar, Eric Savitz at Barron’s gave us more details of Cypress Semiconductor’s spin-off of its SunPower unit. He also provided growing evidence of an impending shake-out in the solar PV sector driven by panel oversupply. Jeff St. John at Greentech Media told us that LG was plotting a partnership with Conergy. He also discusses plans by large South Korean firms, Hyunda i Corp and Samsung, to get involved in solar. Large, well-capitalized conglomerates getting involved in solar PV could be the biggest threat yet to the weaker pure-plays. In Clean Transportation, Energy Tech Stocks reported that Toyota sounded like a Peak Oil advocate in a recent report. But, reported Green Car Congress, Toyota is putting its money where it’s mouth is. In Biomass, Jaymi Heimbuch at Eco Geek reported that Austin was building the nation’s largest wood-waste biomass plant. He also highlighted, however, one of the main risks with such plants: feedstock shortfalls. In Energy Storage, Ecoworld discussed the potential cost of large-scale energy storage for grid balancing purposes. The Week In Cleantech is a collection of our favorite stories from the past week generated by our Cleantech News service. Register your site with us if you want your articles to appear here.