The Commission on Environmental Quality amended 30 Tex. Admin. Code §106.513, Turbines and Engines. The rule change adds a permit for combined heat and power turbines, in which heat resulting from the operation of the engine or turbine is recovered and used for another purpose. See http://www.sos.state.tx.us/texreg/pdf/backview/0810/0810is.pdf (pp. 6037-49).