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Public Service Commission approves Entergy Mississippi UPC factor; FERC-driven MSC changes take effect in October
Summary
The Mississippi Public Service Commission on Thursday approved a staff recommendation to implement Entergy Mississippi’s revised unit power cost recovery rider (Schedule UPC 4), while a separate Federal Energy Regulatory Commission-approved change to the MSC rider takes effect for October billing.
The Mississippi Public Service Commission on Thursday approved a staff recommendation to implement Entergy Mississippi’s revised unit power cost recovery rider (Schedule UPC 4), while a separate Federal Energy Regulatory Commission-approved change to the MSC rider takes effect for October billing.
The change to Schedule UPC 4 reduces the UPC adjustment factor from 9.54892% to 0.27724%, a shift staff said will lower the UPC annual revenue requirement and produce a $12.23 decrease on a typical 1,000 kilowatt-hour residential monthly bill. At the same time, Entergy’s proposed MSC factor of 20.26223% will increase that rider’s annual revenue requirement and add $12.81 to a typical 1,000 kWh bill. The net effect of the two adjustments is a $0.58 increase per month for a typical residential customer, effective with October billing.
Myrick, a commission staff member who presented the filing, told commissioners that Entergy Mississippi’s annual filing covers the October 2025 through September 2026 billing period and that staff had checked the clerical accuracy of the company’s submission and found no errors. "Therefore, staff recommends approval of the proposed order implementing the proposed UPC factor," Myrick said.
The filings are driven in part by a recent FERC order that realigned some costs between the riders after Entergy Mississippi obtained Entergy Louisiana’s share of Grand Gulf capacity, staff said. That reallocation moved amounts previously recovered through UPC into the MSC rider. Staff also reported a projected UPC under-recovery balance of $3,940,000 as of September 2025.
Commissioner Carr asked for clarification on how the two riders differ. "Can you explain the difference between the UPC rider and the MSE rider?" he asked. Myrick explained that the UPC rider was created to recover costs tied to purchases of wholesale baseload generation Entergy Mississippi buys from Entergy Arkansas, while the MSC rider allocates costs related to Entergy Mississippi’s share of Grand Gulf. Myrick said the MSC schedules are derived from FERC-approved formulas and that the MSC filing does not require commission action to become effective.
During the meeting the commission moved to approve the staff recommendation implementing the UPC factor. A motion to approve was made and seconded; the chair called the question and the motion carried. The MSC factor, because it stems from a FERC-approved filing, will take effect for October billing without further commission vote.
The meeting record indicates the changes are part of Entergy Mississippi’s annual UPC and MSC filings and that staff verified the amounts against company records. The docket number for the UPC filing is 2024UN112; the MSC schedules were filed in docket number 2003UN477 (as stated in the filing).
