Microturbines use small combustion turbines to provide electric power for distributed generation (DG) applications, including combined heat and power (CHP). Compared to conventional gas turbine generators, microturbines typically have lower electric generation capacities (30 to 500 kW versus more than 1 MW), lower pressure ratios (about 4 versus 8 to 10), radial-flow designs (versus axial-flow designs), and incorporate recuperators (versus typically unrecuperated designs). Microturbines are promoted as lightweight, compact, low noise/vibration, low emissions, and fuel-flexible compared to competing DG technologies such as internal-combustion-engine generators.