Natural gas used for feedstock and fuel may be supplied to the ammonia plant at or near the pressure that is needed for the ammonia process. About 20-40% of the natural gas supplied is used as reformer fuel and requires significant lower pressures. Expansion turbines can be installed to use the pressure drop and be coupled to a power generator or a cooling water pump. Energy is extracted from pressurized gas, which lowers gas pressure and temperature. Expansion turbines are generally installed in parallel with the regulators that traditionally reduce pressure in gas lines. If flow is too low for efficient generation, or the expansion turbine fails, pressure is reduced in the traditional manner.