Waste heat refers to any heat given off by other machines, generators, components or processes. PowerVerde is creating generators to capture this waste heat and turn it into clean energy.
Geothermal power is generated from places like hot springs that naturally produce enough heat to turn into electricity. While most geothermal power plants are large scale projects, PowerVerde's ORC system could work well at smaller sites.
When most people think of solar power they think of Photovoltaic panels. Solar thermal collectors, instead capture and concentrate the heat from the sun. PowerVerde's sytems can then turn that heat into electricity. One advantage to solar thermal technology is that the heat produced can be stored to continue generating power even after the sun has set without the need for expensive batteries.
Heat can be extracted from biomass. For example large piles of plants will start to decay and give off heat while they decompose. That heat can be captured and PowerVerde's technology could convert it into power.