Dave Johnston Coal Power Plant | Wyoming, USA | 922.2 MW Capacity

Dave Johnston is a coal-fired power plant located in Wyoming, United States, with a capacity of 922.2 MW. Owned by PacifiCorp, the facility is operational and plays a significant role in the region's energy generation. The plant's location in Wyoming places it within a state known for its abundant coal resources and extensive mining operations. The plant operates under the regulatory framework of the U.S. Environmental Protection Agency (EPA), including the Clean Air Act (CAA) and associated programs such as the Acid Rain Program and the Cross-State Air Pollution Rule (CSAPR). As a coal-fired facility, it is subject to emissions standards for sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter. The technology employed is typical for a plant of this era, likely utilizing subcritical or supercritical steam cycles. Dave Johnston's environmental significance stems from its coal fuel source, which results in higher CO2 emissions per MWh compared to natural gas or renewable sources. The plant's capacity of 922.2 MW places it in the medium-to-large scale for coal plants in the U.S. Its proximity to populated areas and local air quality considerations are managed through EPA compliance. The facility provides baseload power to the grid, supporting industrial and residential needs in the region.

The plant's coal fuel type results in significant CO2, SOx, and NOx emissions, contributing to regional air quality concerns. Its location in Wyoming, a state with low population density, reduces direct exposure to large urban populations. However, the plant's age and technology (likely subcritical) may result in lower efficiency and higher emissions per MWh compared to modern supercritical or CCGT plants. Regulatory compliance with EPA programs helps mitigate environmental impact.