Up to 50 percent of all fuel burned in the US goes unused into our atmosphere as wasted heat; the US Department of Energy has found. The total, a mind boggling 7 quadrillion BTUs; exceeds the current output of all other US renewable sources – such as solar, wind and geothermal , combined. We could use this potential waste heat capacity to generate 46 GWs of new, clean electricity annually. Read more of this story »