Martin Energy Group (MEG) manufactures such units to generate heat and power for local use from one of the best known of coal-mine hazards – gas. Processes: The gas is burnt in an engine to drive the generator, while hot water from the engine’s cooling system is typically pumped to a heat recovery boiler, the thermal energy subsequently being used for space heating or to produce process steam. The CHP makes constructive use of the methane-rich coal mine gases that are otherwise harmful for the environment. With methane being more than 20 times more harmful a greenhouse gas than carbon dioxide, capturing even some of it and utilizing it by means of the CHP, can help mitigate greenhouse gas emissions as well as be profitable.