Fossil energy is vital to the nation’s security, with coal serving as the fuel that produces nearly 30% of U.S. electricity. To ensure the continued success of this critical energy resource, NETL is funding advanced research to modernize the grid and improve the efficiency of the existing coal-fired power plant fleet, which strengthens the reliability of all our electricity generation. In coal and other fossil fuel-based power plants, high-pressure, high-temperature steam drives turbines that spin electricity-producing generators. After exiting the turbine, steam moves through the condenser where it’s converted back into liquid so it can be re-heated and re-pressurized to be used again. Condenser performance is largely dependent on how efficiently cold tubes cool the steam and condense it back to liquid. When steam contacts the metal tubes, a film or condensation can form. This layer acts as an insulator between the cold metal and steam, limiting heat transfer and lowering efficiency.