SUPPLEMENTARY INFORMATION:

Under each CSAPR trading program where EPA is responsible for determining emission allowance allocations, a portion of each state's emissions budget for the program for each control period is reserved in a NUSA (and, under most of the trading programs, in an additional Indian country NUSA in the case of states with Indian country within their borders) for allocation to certain units that would not otherwise receive allowance allocations. The procedures for identifying the eligible units for each control period and for allocating allowances from the NUSAs and Indian country NUSAs to these units are set forth in the CSAPR trading program regulations at 40 CFR 97.411(b) and 97.412 (NO_X Annual), 97.511(b) and 97.512 (NO_X Ozone Season Group 1), 97.611(b) and 97.612 (SO₂ Group 1), 97.711(b) and 97.712 (SO₂ Group 2), and 97.811(b) and 97.812 (NO_X Ozone Season Group 2, including units using Original Group 2 allowances and units using Expanded Group 2 allowances).^[1] Each NUSA allowance allocation process involves allocations to eligible units, termed “new” units, followed by the allocation to “existing” units of any allowances not allocated to new units.

In a notice of data availability (NODA) published in the Federal Register on February 28, 2025 (90 FR 10899), EPA provided notice of the preliminary calculations of NUSA allowance allocations for the 2024 control periods and described the process for submitting any objections. EPA received no objections in response to the February 28, 2025 NODA. This NODA concerns the final NUSA allowance allocations.

The detailed unit-by-unit data and final allowance allocation calculations are set forth in Excel spreadsheets titled “CSAPR_NUSA_2024_NOx_Annual_Final_Data_New_Units,” “CSAPR_NUSA_2024_NOx_OS_Final_Data_New_Units,” “CSAPR_NUSA_2024_SO₂ _Final_Data_New_Units,” “CSAPR_NUSA_2024_NOx_Annual_Final_Data_Existing_Units,” “CSAPR_NUSA_2024_NOx_OS_Final_Data_Existing_Units,” and “CSAPR_NUSA_2024_SO₂ _Final_Data_Existing_Units”, available on EPA's website at www.epa.gov/​Cross-State-Air-Pollution/​csapr-compliance-year-2024-nusa-nodas.

EPA notes that an allocation or lack of allocation of allowances to a given unit under a given CSAPR trading program does not constitute a determination that the trading program does or does not apply to the unit. EPA also notes that, under 40 CFR 97.411(c), 97.511(c), 97.611(c), 97.711(c), and 97.811(c), allocations are subject to potential correction if a unit to which allowances have been allocated for a given control period is not actually an affected unit as of the start of that control period.

( Authority:40 CFR 97.411(b), 97.511(b), 97.611(b), 97.711(b), and 97.811(b).)

90 FR 16874