<sod>The mercury cycle offers an efficiency increase compared to a steam-only cycle because energy can be injected into the [[Rankine Cycle]] at higher temperature. Metallurgical developments have allowed steam-only plants to increase in efficiency over time, making the mercury vapour turbine obsolete.  Alas, Today's Combined Cycle Combustion Turbine Generating Stations operate at 61% efficiency, and with none of the safety issues indigenous to a binary mercury Rankine cycle steam power plant<eod>
<sod>The mercury cycle offers an efficiency increase compared to a steam-only cycle because energy can be injected into the [[Rankine Cycle]] at higher temperature. Metallurgical developments have allowed steam-only plants to increase in efficiency over time, making the mercury vapour turbine obsolete.  Modern Combined Cycle Combustion Turbine Generating Stations operate at 61% efficiency, and with none of the safety issues indigenous to a binary mercury Rankine cycle steam power plant<eod>