A system for power generation using low pressure gasification of a stock fuel, such as coal or biomass. The system can include a gasifier, a gas clean up unit connected to a gas compressor, a gas turbine combustion system, a heat recovery steam generator, and a steam turbine. The gasifier can provide low pressure synthetic methane gas to the gas clean up unit, which can remove tars and sulfur from the synthetic methane gas, and can cool the synthetic methane gas. The gas compressor can receive the cooled synthetic methane gas and can compress the cooled synthetic methane gas. The gas turbine combustion system can receive the compressed synthetic methane gas and produce power and an exhaust gas. The heat recovery steam generator can receive the exhaust gas and generate steam. The steam turbine can receive the steam from the heat recovery steam generator and generate power.