EVERGY KANSAS CENTRAL, INC.

4. RATE MATTERS AND REGULATION

KCC Proceedings

Evergy Kansas Central's 2025 Rate Case Proceeding

In January 2025, Evergy Kansas Central filed an application with the KCC to request an increase to its retail revenues of approximately $196 million. Evergy Kansas Central's request reflected a return on equity of 10.5% (with a capital structure composed of 52% equity) and increases related to the recovery of infrastructure investments made to improve reliability and enhance customer service and the update of expenses to current levels of spend.

In July 2025, Evergy Kansas Central, KCC staff and other intervenors reached a unanimous settlement agreement to settle all issues in the case. The unanimous settlement agreement provides for an increase to retail revenues of $128.0 million after rebasing property tax expense and not including costs recoverable through KCC-approved riders for Evergy Kansas Central. In September 2025, the KCC approved the unanimous settlement agreement and new rates took effect in October 2025.

Earnings Review and Sharing

As part of the settlement agreement in Evergy Kansas Central's 2025 KCC rate case, Evergy Kansas Central agreed to participate in an earnings review surveillance report for each calendar year beginning 2025 through the time Evergy Kansas Central files its next general rate case and new base rates become effective as a result of that case. Under this mechanism, Evergy Kansas Central’s jurisdiction is required to refund customers 50% of annual earnings in excess of a 9.7% return on equity.

As of December 31, 2025, Evergy Kansas Central estimates its 2025 annual earnings will not result in a refund obligation under the earnings review mechanism. Evergy Kansas Central expects to file its 2025 earnings calculation with the KCC in March 2026. The final refund obligation for 2025, if any, will be decided by the KCC and could vary from the current estimate.

Applications for Predetermination

The KCC uses a process referred to as ‘predetermination’ to establish ratemaking principles and treatments for certain utility investments before they are included in a utility’s rate base. The process helps balance the interest of utilities and customers by ensuring broad agreement to the reasonableness of the investment and regulatory certainty regarding the recovery of costs associated with the investment. Investment in utility projects may be dependent on acceptable regulatory treatment determined in the predetermination process.

In November 2024, Evergy Kansas Central requested predetermination from the KCC for its planned natural gas plant investments and Kansas Sky solar investment. In April 2025, Evergy Kansas Central and intervenors in the case reached a non-unanimous partial settlement agreement regarding its planned natural gas plant investments and a unanimous partial settlement agreement regarding the Kansas Sky solar investment.

In July 2025, the KCC approved the non-unanimous partial settlement agreement for the natural gas plant investments establishing that Evergy Kansas Central's investment in its planned natural gas plants is prudent. This agreement will permit Evergy Kansas Central to implement a CWIP riderone year after construction of each plant begins and Evergy Kansas Central will recover through the CWIP rider the return on up to 100% of amounts recorded to CWIP for each plant, not to exceed definitive cost estimates established by the KCC unless otherwise ordered by the KCC. Evergy Kansas Central will be permitted to update rates charged through the CWIP rider everysix months. Evergy Kansas Central will be permitted to collect these amounts through the CWIP rider until new base rates reflecting Evergy Kansas Central's investment in the natural gas plants take effect. Evergy Kansas Central will not be able to accrue AFUDC on these amounts once the CWIP rider becomes effective and is included in customer rates. When new base rates reflecting Evergy Kansas Central's investment in each plant take effect, those base rates will include a deferral for depreciation expense incurred and carrying costs on any unrecovered portion of Evergy Kansas Central's investment in natural gas plants incurred between the time the natural gas plants are placed in service and the time the investment in the natural gas plants is included in base rates. Investments above certain amounts established in the settlement agreement will be subject to a prudence review.

In July 2025, the KCC approved the unanimous partial settlement agreement for the Kansas Sky solar investment. After the investment is placed in service and prior to the effective date of rates that include the investment, Evergy

Kansas Central will be permitted to defer to a regulatory asset and recover over the remaining life of the Kansas Sky solar investment depreciation expense, carrying costs and other costs incurred. Thereafter, Evergy Kansas Central’s investment in Kansas Sky will be recovered through a levelized revenue requirement for the first thirty years of the life of the generation site, after which the levelized revenue requirement will be reevaluated.

In July 2024, a lawsuit was filed in the District Court of Douglas County, Grant Township, et al. v. Board of County Commissioners, requesting the court to overturn Douglas County's approval of the application to construct the solar generation facility. Due to the ongoing litigation, including the court's granting of an emergency injunction in December 2024 which temporarily prohibits construction of the solar generation facility, Evergy Kansas Central is not able to estimate when the solar generation facility will begin operations.

Evergy Kansas Central 2025 Transmission Delivery Charge (TDC)

In April 2025, the KCC issued an order adjusting Evergy Kansas Central's retail prices to include updated transmission costs as reflected in the FERC transmission formula rate (TFR). The new prices were effective in May 2025 and are expected to increase Evergy Kansas Central's annual retail revenues by $54.8 million when compared to 2024.

Evergy Metro 2025 TDC

In April 2025, the KCC issued an order adjusting Evergy Metro's retail prices to include updated transmission costs as reflected in the FERC TFR. The new prices were effective in May 2025 and are expected to increase Evergy Metro's annual retail revenues by $4.8 million when compared to 2024.

MPSC Proceedings

Evergy Metro's 2026 Rate Case Proceeding

In February 2026, Evergy Metro filed an application with the MPSC to request an increase to its retail revenues of approximately $140 million. Evergy Metro's request reflected a return on equity of 10.5% (with a capital structure composed of 52% equity) and increases related to the recovery of infrastructure investments made to improve reliability and enhance customer service and the update of expenses to current levels of spend. New rates are expected to be effective in January 2027.

Evergy Missouri West's 2024 Rate Case Proceeding

In January 2025, Evergy Missouri West implemented new rates approved by the MPSC in December 2024 providing for an increase to Evergy Missouri West's retail revenues of approximately $55 million after lowering base rates for fuel and purchased power expense of approximately $49 million and rebasing property tax expense.

Requests for Certificate of Convenience and Necessity

Missouri utilities must request a CCN from the MPSC to authorize them to build certain utility projects. The CCN process authorizes utilities to build projects and can provide assurance that the project is prudent and necessary. Investment in projects is dependent upon the granting by the MPSC of a CCN with reasonably acceptable terms.

In 2024, Evergy Missouri West filed applications for CCNs for its planned renewable and natural gas plant investments. In May 2025, Evergy Missouri West entered into a unanimous stipulation and agreement with the MPSC staff and other intervenors that would grant Evergy Missouri West’s CCNs to construct, install, own, operate, maintain and otherwise control and manage Sunflower Sky and Foxtrot solar generating facilities. In May 2025, Evergy Missouri West entered into a non-unanimous stipulation and agreement with the MPSC staff and other intervenors that would grant Evergy Missouri West’s CCNs to construct, install, own, operate, maintain and otherwise control and manage its planned natural gas plant investments.

In July 2025, the MPSC approved the unanimous stipulation and agreement for Sunflower Sky and Foxtrot solar generating facilities granting Evergy Missouri West's CCN request for its planned renewable plant investments. Evergy Missouri West plans to utilize PISA, as applicable, for its planned renewable plant investments.

In July 2025, the MPSC approved the non-unanimous stipulation and agreement for the natural gas plant investments granting Evergy Missouri West's CCN and establishing that Evergy Missouri West’s planned investments in the natural gas plants are decisionally prudent. Evergy Missouri West intends to utilize the SB 4 CWIP inclusion provision and PISA, as applicable, for its planned investments in the natural gas plants.

FERC Proceedings

In October of each year, Evergy Kansas Central and Evergy Metro post an updated TFR that includes projected transmission capital expenditures and operating costs for the following year. This rate is the most significant component in the retail rate calculation for Evergy Kansas Central's and Evergy Metro's annual request with the KCC to adjust retail prices to include updated transmission costs through the TDC.

Evergy Kansas Central TFR Annual Update

Most recently, the updated TFR was expected to adjust Evergy Kansas Central's annual transmission revenues by approximately:

•$21.6 million increase effective in January 2026;

•$19.1 million increase effective in January 2025; and

•$115.8 million increase effective in January 2024.

Evergy Kansas Central TFR Formal Complaint

In February 2023, certain Evergy Kansas Central TFR customers submitted a formal complaint with FERC requesting the refund of over-collections related to the capital structure calculation in determining Evergy Kansas Central's Annual Transmission Revenue Requirement for the 2018 and 2019 rate years. As of December 31, 2025, and December 31, 2024, Evergy and Evergy Kansas Central had recorded a regulatory liability of $9.7 million and $7.1 million, respectively, related to the 2018 and 2019 rate year refund request. Evergy and Evergy Kansas Central are awaiting a response from FERC.

Evergy Metro TFR Annual Update

Most recently, the updated TFR was expected to adjust Evergy Metro's annual transmission revenues by approximately:

•$2.4 million decrease effective in January 2026;

•$1.0 million increase effective in January 2025; and

•$23.7 million increase effective in January 2024.

Regulatory Assets and Liabilities

The Evergy Companies have recorded assets and liabilities on their consolidated balance sheets resulting from the effects of the ratemaking process, which would not otherwise be recorded if they were not regulated. Regulatory assets represent incurred costs that are probable of recovery from future revenues. Regulatory liabilities represent future reductions in revenues or refunds to customers.

Management regularly assesses whether regulatory assets and liabilities are probable of future recovery or refund by considering factors such as decisions by the MPSC, KCC or FERC in Evergy Kansas Central's, Evergy Metro's and Evergy Missouri West's rate case filings; decisions in other regulatory proceedings, including decisions related to other companies that establish precedent on matters applicable to the Evergy Companies; and changes in laws and regulations. If recovery or refund of regulatory assets or liabilities is not approved by regulators or is no longer deemed probable, these regulatory assets or liabilities are recognized in the current period results of operations. The Evergy Companies continued ability to meet the criteria for recording regulatory assets and liabilities may be affected in the future by restructuring and deregulation in the electric industry or changes in accounting rules. In the event that the criteria no longer applied to any or all of the Evergy Companies' operations, the related regulatory assets and liabilities would be written off unless an appropriate regulatory recovery mechanism were provided. Additionally, these factors could result in an impairment on utility plant assets.

The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.

The following summarizes the nature and period of recovery for each of the regulatory assets listed in the table above.

Pension and post-retirement costs: Represent the difference between pension and post-retirement costs under GAAP and pension and post-retirement costs for ratemaking that will be recovered in future rates. Of this amount, as of December 31, 2025, $35.8 million is not included in rate base and is amortized over various periods.

Debt reacquisition costs: Includes costs incurred to reacquire and refinance debt. These costs are amortized over the term of the new debt or the remaining lives of the old debt issuances if no new debt was issued and are not included in rate base.

Debt fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West long-term debt at fair value in connection with the merger that created Evergy. Amount is amortized over the life of the related debt and is not included in rate base.

Asset retirement obligations fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West AROs at fair value in connection with the merger that created Evergy. Amount is amortized over the life of the related plant and is not included in rate base.

Depreciation: Represents depreciation and carrying costs deferred under PISA approved in Kansas and Missouri where depreciation incurred on assets placed in service prior to inclusion in rates can be deferred until the next general rate case and then amortized over a 20-year period and included in rate base.

Cost of removal: Represents amounts spent, but not yet collected, to dispose of plant assets. This asset will decrease as removal costs are collected in rates and is included in rate base.

Asset retirement obligations: Represents amounts associated with AROs as discussed further in Note 6. These amounts are recovered over the life of the related plant and are not included in rate base.

Analog meter unrecovered investment: Represents the deferral of unrecovered investment of retired analog meters. These costs are not included in rate base and are amortized through 2028.

Treasury yield hedges: Represents the effective portion of treasury yield hedge transactions. Amortization of this amount will be included in interest expense over the term of the related debt and is not included in rate base.

Iatan No. 1 and common facilities: Represents depreciation and carrying costs related to Iatan No. 1 and common facilities. These costs are included in rate base and amortized through 2057.

Iatan No. 2 construction accounting costs: Represents the construction accounting costs related to Iatan No. 2. These costs are included in rate base and amortized through 2059.

Property taxes: Represents actual costs incurred for property taxes in excess of amounts collected in revenues. These costs are expected to be recovered over various periods and are not included in rate base.

Disallowed plant costs: The KCC originally disallowed certain costs related to the Wolf Creek plant. In 1987, the KCC revised its original conclusion and provided for recovery of an indirect disallowance with no return on investment. This regulatory asset represents the present value of the future expected revenues to be provided to recover these costs, net of the amounts amortized.

La Cygne environmental costs: Represents the deferral of depreciation and amortization expense and associated carrying charges related to the La Cygne Station environmental project. This amount will be amortized over the life of the related asset and is included in rate base.

Deferred customer programs: Represents costs related to various energy efficiency programs that have been accumulated and deferred for future recovery. These amounts are not included in rate base and are amortized over various periods.

Fuel recovery mechanisms: Represents the actual cost of fuel consumed in producing electricity and the cost of purchased power in excess of the amounts collected from customers. This difference is expected to be recovered over aone-year period and is not included in rate base.

February 2021 winter weather event: Represents deferred extraordinary fuel and purchased power costs incurred to provide electric service as a result of the February 2021 winter weather event. These amounts are not included in rate base and were fully amortized in 2025.

February 2021 winter weather event securitized costs: Represents deferred extraordinary fuel and purchased power costs incurred to provide electric service as a result of the February 2021 winter weather event. In February 2024, Evergy Missouri West securitized this asset. Evergy Missouri West expects to recover the amounts through 2038.

Solar rebates: Represents costs associated with solar rebates provided to retail electric customers. These amounts are not included in rate base and were fully amortized in 2025.

Transmission delivery charge: Represents costs associated with the transmission delivery charge. The amounts are not included in rate base and are amortized over aone-year period.

Wolf Creek outage: Represents deferred expenses associated with Wolf Creek's scheduled refueling and maintenance outages. These expenses are amortized during the period between planned outages and are not included in rate base.

Pension and other post-retirement benefit non-service costs: Represents the non-service component of pension and post-retirement net benefit costs that are capitalized as authorized by regulators. The amounts are included in rate base and are recovered over the life of the related asset.

Retired generation facilities: Represents amounts to be recovered for facilities that have been retired, are not included in rate base and recovered through 2030.

Merger transition costs: Represents recoverable transition costs related to the merger that created Evergy. The amounts are not included in rate base and are recovered through 2028.

Other regulatory assets: Includes various regulatory assets that individually are small in relation to the total regulatory asset balance. Of these amounts, $5.5 million, $4.9 million and $0.3 million for Evergy, Evergy Kansas Central and Evergy Metro, respectively, are included in rate base and are amortized over various periods.

The following summarizes the nature and period of amortization for each of the regulatory liabilities listed in the table above.

Taxes refundable through future rates: Represents the obligation to return to customers income taxes recovered in earlier periods when corporate income tax rates were higher than current income tax rates. A large portion of this amount is related to depreciation and will be refunded to customers over the life of the applicable property.

Nuclear production tax credits: Represents nuclear production tax credits (PTCs) generated by Wolf Creek. The benefits from these credits are expected to be refunded to customers in future rates following the monetization of the credits.

Deferred regulatory gain from sale leaseback: Represents the gain Evergy Kansas South recorded on the 1987 sale and leaseback of its 50% interest in La Cygne Unit 2. The gain is amortized over the term of the lease.

Emission allowances: Represents deferred gains related to the sale of emission allowances to be refunded to customers.

Nuclear decommissioning: Represents the difference between the fair value of the assets held in the nuclear decommissioning trust and the amount recorded for the accumulated accretion and depreciation expense associated with the asset retirement obligation related to Wolf Creek.

Pension and post-retirement costs: Represents the difference between pension and post-retirement costs under GAAP, including accumulated unrecognized gains, and pension and post-retirement costs for ratemaking that will be refunded in future rates.

Jurisdictional allowance for funds used during construction: Represents AFUDC that is accrued subsequent to the time the associated construction charges are included in prices and prior to the time the related assets are placed in service. The AFUDC is amortized to depreciation expense over the useful life of the asset that is placed in service.

La Cygne leasehold dismantling costs: Represents amounts collected but not yet spent on the contractual obligation to dismantle a portion of La Cygne Unit 2. The obligation will be discharged as the unit is dismantled.

Kansas tax credits: Represents Kansas tax credits on investment in utility plant. Amounts will be credited to customers subsequent to the realization of the credits over the remaining lives of the utility plant giving rise to the tax credits.

Purchase power agreement: Represents the amount included in retail electric rates from customers in excess of costs incurred under purchase power agreements. Amounts are amortized over afive-year period.

Fuel recovery mechanisms: Represents the amount collected from customers in excess of the actual cost of fuel consumed in producing electricity and the cost of purchased power. This difference is expected to be refunded over aone-year period.

February 2021 winter weather event: Represents refunds to customers related to a February 2021 winter weather event.

Sibley accounting authority order: These amounts were collected in connection with an accounting authority order (AAO) granted by the MPSC in October 2019 and represent revenues that Evergy Missouri West collected from customers for the return on its unrecovered investment in Sibley Station, non-fuel operations and maintenance costs and other costs associated with Sibley Station following its retirement in November 2018. The amended final order in Evergy Missouri West's 2022 rate case required Evergy Missouri West to refund these revenues to customers over afour-year period.

TFR refunds: These amounts are associated with a formal complaint certain Evergy Kansas Central TFR customers submitted with FERC requesting the refund of over-collections related to the capital structure calculation in determining Evergy Kansas Central's Annual Transmission Revenue Requirement for the 2018 and 2019 rate years. See "Evergy Kansas Central TFR Formal Complaint" within this Note 4 for additional information.

COLI rate credits refund: Represents the amount ordered to be refunded by Evergy Kansas Central to customers and will be amortized through 2027, to account for the difference between the expected amount of COLI rate credits approved and the actual amount of COLI rate credits received by customers from 1987 through 2023.

Levelized rate recovery: Instead of traditional ratemaking, the KCC ordered that Evergy Kansas Central recover the costs of several owned wind farms through a levelized revenue requirement. The levelized recovery of costs defers the rates intended to recover allowable costs for each wind farm beyond the period in which those costs would be charged to expense under traditional ratemaking. The regulatory liability represents the cumulative amount collected in accordance with the ordered ratemaking treatment in excess of the amount that would have been collected under traditional ratemaking.

Other regulatory liabilities: Includes various regulatory liabilities that individually are relatively small in relation to the total regulatory liability balance. These amounts will be credited over various periods.