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Regulatory matters
 9 Months Ended
Sep. 30, 2023
Regulated Operations [Abstract]  
Regulatory Matters Regulatory matters
The Company regularly reviews the need for electric and natural gas rate changes in each of the jurisdictions in which service is provided. The Company files for rate adjustments to seek recovery of operating costs and capital investments, as well as reasonable returns as allowed by regulators. Certain regulatory proceedings and cases may also contain recurring mechanisms that can have an annual true-up. Examples of these recurring mechanisms include: infrastructure riders, transmission trackers, renewable resource cost adjustment riders, as well as weather normalization and decoupling mechanisms. The following paragraphs summarize the Company's significant open regulatory proceedings and cases by jurisdiction including updates to those reported in the 2022 Annual Report and should be read in conjunction with previous filings. The Company is unable to predict the ultimate outcome of these matters, the timing of final decisions of the various regulators and courts, or the effect on the Company's results of operations, financial position or cash flows.
MTPSC
On November 4, 2022, Montana-Dakota filed an application with the MTPSC for an electric general rate increase of approximately $10.5 million annually or 15.2 percent above current rates, which was revised on March 15, 2023, to $11.5 million annually or 17.0 percent above current rates to reflect the loss of a large industrial customer. The requested increase is primarily to recover investments made since the last rate case, including Heskett Unit 4, increases in operation and maintenance expenses, and increases in property taxes. On January 24, 2023, the MTPSC approved Montana-Dakota's request for an interim increase of approximately $1.7 million or 2.7 percent above current rates, subject to refund, effective February 1, 2023. On June 12, 2023, an all-party settlement agreement was filed reflecting an annual revenue increase of $6.1 million or 9.1 percent overall. The reduction from the original filing includes a return on equity of 9.65 percent and removal of Heskett Unit 4 due to not being in service until the second half of 2023. The MTPSC issued a final order approving the settlement on September 21, 2023, with rates effective October 1, 2023.
NDPSC
On July 14, 2023, Montana-Dakota filed an application with the NDPSC to request an update to its transmission cost adjustment rider requesting to recover revenues of $2.2 million, which includes a true-up of a prior period adjustment, resulting in a decrease of $10.7 million from current rates. The request is to recover transmission-related expenses and the revenue requirement for transmission facilities not currently recovered through electric service rates. The request also reflects the inclusion of the proposed net benefit of a large customer now taking service under Rate 45, as discussed in Part I, Item 2, which accounted for approximately $7.6 million of the decrease. A revised filing was submitted on August 25, 2023, reducing the request to $1.3 million. The NDPSC approved the transmission cost adjustment on September 27, 2023, with rates effective November 1, 2023.
On November 1, 2023, Montana-Dakota filed a request with the NDPSC for a natural gas general rate increase of approximately $11.6 million annually or 7.5 percent above current rates. The requested increase is primarily to recover investments in system upgrades and pipeline replacement projects enhancing the reliability, safety and integrity of the natural gas system, as well as increased costs to operate and maintain that system. The filing also includes a request for interim revenue of $10.1 million, subject to refund, to be effective early January 2024. The NDPSC has up to seven months to issue a final decision on this general rate increase request. This matter is pending before the NDPSC.
Montana-Dakota has a renewable resource cost adjustment rate tariff that allows for annual adjustments for recent projected capital costs and related expenses for projects determined to be recoverable under the tariff. On October 31, 2023, Montana-Dakota filed an annual update to its renewable resource cost adjustment requesting to recover a revenue requirement of approximately $21.0 million annually. The update reflects an increase of approximately $5.7 million from the revenues currently included in rates. The request proposes the rates be effective for service rendered on and after February 1, 2024. This matter is pending before the NDPSC.
SDPUC
On August 15, 2023, Montana-Dakota filed a request with the SDPUC for an electric general rate increase of approximately $3.0 million annually or 17.3 percent above current rates. The requested increase is primarily to recover investments in production, transmission and distribution facilities and the associated depreciation, operation and maintenance expenses and taxes associated with the increased investment. The SDPUC has up to six months to issue a decision on this request. This matter is pending before the SDPUC.

On August 15, 2023, Montana-Dakota filed a request with the SDPUC for a natural gas general rate increase of approximately $7.4 million annually or 11.2 percent above current rates. The requested increase is primarily to recover investments and the associated depreciation, operation and maintenance expenses and taxes associated with the increased investment. The SDPUC has up to six months to issue a decision on this request. This matter is pending before the SDPUC.
WUTC
On June 1, 2023, Cascade filed its annual pipeline cost recovery mechanism requesting an increase in annual revenue of approximately $3.1 million or 0.9 percent, which was revised on October 13, 2023, to $2.4 million or 0.7 percent. The filing was effective November 1, 2023.
FERC
On January 27, 2023, WBI Energy Transmission filed a general rate case with the FERC for increases in its transportation and storage services rates that also included a Greenhouse Gas Cost Recovery Mechanism for anticipated future costs. In August 2023, the Company reached a rate case settlement agreement with its customers and FERC staff and the agreed-upon rates were placed into effect as of August 1, 2023. The settlement agreement did not include a Greenhouse Gas Cost Recovery Mechanism. On October 17, 2023, the Administrative Law Judge certified the Company's rate case settlement agreement to the FERC for final approval.
On August 31, 2023, Montana-Dakota filed an update to its transmission formula rate under the MISO tariff for its multi-value project and network upgrade changes for $15.2 million to be effective January 1, 2024.