The pressure to maximize efficiency is growing for oil and gas producers, possibly setting up Capstone Turbine as a key supplier. Capstone makes microturbines, a relatively small refrigerator-size engine that can generate electricity and improve efficiency, and that can capture and reuse waste heat lost in any production process. Companies are increasingly capturing and reusing thermal energy to produce heat and power for their facilities, a concept known in the energy community as cogeneration. At the same time, the push to lower carbon emissions is making the use of microturbines an obvious choice. Microturbines can also be used at coal sites, even closed mines which seep gas for years, to make emissions from the battle-scarred coal industry cleaner and put them to use as a power source.