Infinia has developed utility-scale renewable energy technology that combines a Stirling engine with a large solar collector. The Stirling engine, a technology that’s been around since the 19th century, converts the heat into electricity. Infinia used to be called Stirling Cycles, and has been around for more than two decades. It has designed Stirling engines as power sources for NASA missions, implantable artificial hearts, and cooling devices that the army uses in Iraq. Now, it is focussed exclusively on using the technology to create 14-foot diameter solar collectors that can generate 3.5 kilowatts of energy apiece. Gang together 50 or 100 (at about $20,000 a pop) and you have the energy producing capacity of a small power plant.