Federal Register Date: 2026-04-15
Original Source: Read Full Notice
The U.S. Environmental Protection Agency (EPA) is announcing the availability of data concerning emission allowance allocations under the Cross-State Air Pollution Rule (CSAPR) trading programs. Specifically, this notice pertains to the final calculations for allowance allocations from the new unit set-asides (NUSAs) for the 2025 control periods. Furthermore, the EPA has finalized calculations for the distribution of remaining 2025 NUSA allowances to existing units. These calculations have been made publicly available on the EPA’s website in spreadsheet format.
The CSAPR, a cornerstone of EPA’s efforts to address interstate air pollution, establishes emission reduction requirements for power plants in specific states that significantly contribute to ozone and/or fine particulate matter (PM2.5) pollution in downwind states. The CSAPR trading programs are designed to provide a flexible and cost-effective approach for power plants to meet these emission reduction obligations. The programs operate on a cap-and-trade system, where a regional emissions cap is established, and emission allowances are allocated to covered power plants. These plants can then trade allowances, allowing them to choose the most cost-effective method to comply with the emission limits.
The NUSAs play a critical role within the CSAPR framework, particularly in accommodating new sources of emissions while maintaining overall emission reduction goals. NUSAs are essentially pools of emission allowances specifically reserved for new units that commence operation and are subject to the CSAPR requirements. These allowances provide a pathway for new sources to enter the market without disrupting the existing allocation structure or hindering the progress towards achieving regional emission reduction targets. The allocation of allowances from the NUSA is typically based on factors such as the unit’s heat input, emission rate, and operating hours.
The allocation process for the 2025 control periods involved a detailed analysis of data submitted by affected power plants and other relevant information. The EPA meticulously reviewed this information to ensure accuracy and consistency with the CSAPR regulations. The calculations were performed using established methodologies outlined in the rule, taking into account factors such as the size of the NUSA, the number of eligible new units, and their respective emission characteristics. The final allocations represent the EPA’s determination of the appropriate number of allowances each unit should receive from the NUSA for the specified control periods.
The availability of these final allocation calculations is crucial for power plant operators and other stakeholders involved in the CSAPR trading programs. The information allows them to understand their allowance holdings for the 2025 control periods and to make informed decisions regarding their compliance strategies. Power plants can use this information to plan their operations, assess their allowance needs, and engage in allowance trading activities. The transparency provided by the EPA through the public posting of these calculations fosters confidence in the integrity of the CSAPR trading programs.
The EPA’s website serves as the central repository for all relevant information pertaining to the CSAPR trading programs, including the allocation calculations for the 2025 control periods. The spreadsheets containing the final allocations are readily accessible and downloadable, enabling stakeholders to easily access and analyze the data. The EPA encourages all affected parties to review these calculations carefully and to contact the Agency with any questions or concerns. By providing clear and transparent information, the EPA aims to facilitate the smooth and effective implementation of the CSAPR and to ensure that the program continues to deliver significant air quality and public health benefits. The specific pollutants addressed under CSAPR include sulfur dioxide (SO2) and nitrogen oxides (NOx), both of which are precursors to the formation of fine particulate matter and ozone. Reducing emissions of these pollutants is essential for improving air quality and protecting public health in downwind states.