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Trina Solar Limited (NYSE: TSL) ("Trina Solar" or the "Company"), a leading integrated manufacturer of solar photovoltaic products from the production of ingots, wafers and cells to the assembly of PV modules, today announced the inauguration of the largest rooftop solar system in Europe with a capacity of 40MW.

There’s a promising new entry in the race to build cheap batteries for storing energy from solar panels and wind turbines. Stanford researchers led by Yi Cui, a professor of materials science and engineering, have demonstrated a partially liquid battery made of inexpensive lithium and sulfur. Cui says the battery will be easy to make and will last for thousands of charging cycles. Cui believes that the material and manufacturing costs of the battery might be low enough to meet the Department of Energy’s goal of $100 per kilowatt-hour of storage capacity, which the DOE estimates will make the technology economically attractive to utilities. Existing batteries can cost hundreds of dollars per kilowatt-hour of capacity, although several companies are working to commercialize cheaper ones (see “Ambri’s Better Battery” and “Battery to Take On Diesel and Natural Gas”).

“The $24m multihull white catamaran is topped by around 5,300 square feet of black photovoltaic solar panels consisting of 38,000 next-generation solar cells provided by solar manufacturer SunPower,” Tom Young of Business Green writes.

The first solar-powered air conditioner that can also send energy to the grid has rolled off the production line of China’s largest residential air-conditioner manufacturer Gree Electric Appliances.

The Qpinch Heat Transformer recovers residual heat from 40 °C / 104 °F and up. It is applicable on a megawatt scale throughout all major industries that use industrial heat, including food and feed, oil & chemicals, paper and pulp, cement and manufacturing.