Over 60% of the $10 trillion in energy produced globally every year is wasted, mostly in the form of heat from power plants, industry, and transportation. Capturing this lost energy has the potential to generate 2.3 Quads per year of electricity in the US alone, 17% of US electric generation. Thermoelectric materials offer a means of realizing this opportunity, which is compact and has no moving parts, but existing devices are preclusively expensive due to exotic raw materials and complex manufacturing. Alphabet Energy