Environmental Studies

How Did We Estimate The Environmental Benefits?

Clean Line Energy Partners commissioned Leidos to run a production simulation study using PROMOD software to determine the emissions and water use reduction impacts that would result from the delivery of 4,000 MW of wind power from the Oklahoma Panhandle region to central Arkansas and western Tennessee via a high voltage direct current (HVDC) transmission line – the Plains & Eastern Clean Line. The model simulated the delivery of 500 MW to Arkansas and 3,500 MW to Tennessee.

Emissions and Water-Use Reductions with Plains & Eastern Clean Line in Operation

Carbon Dioxide (CO2) 13,000,000 tons
Nitrogen Oxides (NOx) 5,000 tons
Sulfur Dioxide (SO2) 11,000 tons
Mercury (Hg) 194 pounds
Water (H2O) 3,420,000,000 gallons

How were emissions reductions calculated?

A study database licensed from Ventyx was used for many of the input assumptions to these production simulations. This database includes emission production rates for nitrogen oxide (NOx), sulfur dioxide (SO2), and carbon dioxide (CO2). The source of this data comes from public filings required by the Environmental Protection Agency (EPA) for most generating stations. For those stations that do not have to file emissions reports, the emissions rates of plants that have similar characteristics to the non-reporting generating stations’ rates were used. The total volume (in tons or pounds) produced for each of these effluents is calculated by PROMOD during the simulation by multiplying the hourly output of each generator times the appropriate emissions production rate. Reductions in mercury (Hg) were calculated after completion of the Base case and Plains & Eastern Clean Line case PROMOD runs by multiplying unit-specific EPA production rates for mercury times the annual energy production for all coal plants modeled in the study. Reductions in water usage (evaporation) were estimated using general water consumption rates for each unit type (coal, combined cycle, combustion turbine, etc) combined with annual generation results from the PROMOD Base case and Plains & Eastern Clean Line case simulations. These benefits are a direct result from the reduced need for conventional, emissions-producing generation due to the addition of new wind resources facilitated by the Plains & Eastern Clean Line project.