Large Load Power Service combines electricity supply, generation demand, grid service, transmission, and recovery riders. The forecast covers transmission and substation service for a steady load supplied entirely from the grid.
Service overview
| Item | Coverage |
|---|---|
| Service | Kansas · SPP · Evergy Kansas Central Large Load Power Service (LLPS). Transmission and substation voltage options use the same charge structure, with different grid rates. |
| Tariff version | Effective November 6, 2025, under KCC Docket 25-EKME-315-TAR. Applies to qualifying new loads or expansions of at least 75 MW. |
| Supply | Bundled utility supply. The base energy charge and Retail Energy Cost Adjustment (RECA) together recover energy supply costs. |
| Forecast period | The rate forecast begins in 2026. Summer is June–September; winter is October–May. |
| Dollar basis | Real 2026 dollars, consistent with the SPP forecast. |
Charge breakdown
| Line item / what it pays for | Tariff Charge Type | How the Charge Is Assessed | Calculation basis |
|---|---|---|---|
| Customer service | Distribution | Fixed | Monthly customer amount multiplied by share of the month served. |
| Grid service | Distribution | Capacity (demand-based) | Monthly peak imported MW multiplied by grid rate for the service voltage multiplied by share of the month served. |
| Generation demand | Generation | Capacity (demand-based) | Monthly peak imported MW multiplied by seasonal demand rate multiplied by share of the month served. |
| Base electricity supply | Supply | Energy | Imported MWh multiplied by base energy rate. |
| Retail Energy Cost Adjustment (RECA) | Rider | Energy | Imported MWh multiplied by energy adjustment rate. |
| Energy Efficiency Rider (EER) | Rider | Energy | Imported MWh multiplied by energy-efficiency recovery rate. |
| Property Tax Surcharge (PTS) | Rider | Energy | Imported MWh multiplied by property-tax recovery rate. |
| Transmission Delivery Charge (TDC) | Transmission | Capacity (demand-based) | Monthly peak imported MW multiplied by transmission rate multiplied by share of the month served. |
| Sales tax on energy charges | Rider | Energy | Tax rate multiplied by base energy, Retail Energy Cost Adjustment, Energy Efficiency Rider, and Property Tax Surcharge charges. |
| Sales tax on demand and grid charges | Rider | Capacity (demand-based) | Tax rate multiplied by generation demand and grid charges. |
| Sales tax on customer service | Rider | Fixed | Tax rate multiplied by customer service charge. |
How charges are calculated
Energy and monthly charges
- Energy charges multiply imported MWh by each applicable rate in $/MWh.
- Generation demand, grid service, and transmission each multiply monthly peak imports by their rate in $/MW-month.
- Customer service is a fixed monthly amount.
- Monthly demand and fixed charges are prorated by service days divided by calendar days in the month.
The monthly demand charge is calculated by multiplying peak imported MW by the rate in $/MW-month. It is allocated by service days as a share of the days in the month.
What demand means here
Generation demand pays for generation available to serve the customer. Grid service pays for delivery facilities, while the Transmission Delivery Charge (TDC) recovers transmission costs. Each uses a demand-based assessment: the forecast charge depends on the site’s highest grid import.
The filed tariff measures demand in 15-minute intervals. Its billing rules include an 80% annual contract-capacity minimum and a grid-demand rule based on the highest monthly demand over the current and prior eleven months.
The forecast assumes steady imports equal to contract capacity, with no higher prior peak. Under those conditions, monthly peak imports also satisfy the minimum and prior-peak rules. The forecast does not recalculate those rules for a variable load or a ramp-up period.
Energy supply
The Retail Energy Cost Adjustment (RECA) recovers fuel and purchased-power costs. In the forecast, base energy and this adjustment together follow the annual average day-ahead electricity price in the Westar Energy (WR) area of Southwest Power Pool (SPP). This area provides the regional price benchmark. The adjustment is the difference between that combined energy rate and the base energy rate, so the forecast applies one annual energy price.
The Retail Energy Cost Adjustment rate is the combined energy rate less the base energy rate.
Sales tax
The reference bill assumes a nonexempt customer, with 6.5% Kansas state sales tax and no added local tax. Separate tax amounts apply to energy charges, generation demand and grid charges, and customer service. The Transmission Delivery Charge is excluded from the forecast tax base.
Forecast methodology
| Charge | How its rate changes |
|---|---|
| Generation demand and grid service | Rates follow the costs of generation and delivery assets: return, depreciation, operating costs, and allocated general costs. Those costs are divided by forecast billed demand, measured as the sum of monthly peaks. |
| Capital and load growth | Uses the 2026–2030 capital plan, with a three-year construction lag for new generation. Later generation additions follow load growth; other capital spending continues from plan averages with 2% annual nominal inflation. Westar-area load growth scales sales and billed demand. Cost-allocation shares remain fixed. |
| Base energy and Retail Energy Cost Adjustment | Base energy follows nonfuel generation operating costs per MWh. The combined base energy and Retail Energy Cost Adjustment rate scales with the annual average Westar-area day-ahead price relative to January–October 2026. |
| Transmission Delivery Charge | Starts from the filed rate and adds the customer class’s share of incremental SPP Schedule 11 costs above the 2026 baseline. The source costs are already allocated to Kansas Central. Retail and class shares and the annual billing-demand denominator remain fixed. |
| Energy Efficiency Rider | Uses approved program budgets, reserves, and observed program costs and savings. Later recoveries continue the benchmark with inflation; future true-ups are zero. |
| Property Tax Surcharge | Estimates property taxes from prior-year nontransmission plant costs, subtracts recovery already included in base rates and wholesale service, and divides the balance by retail energy sales. Rates reset in February; scheduled historical adjustments expire. |
| Customer service | Continues the annual growth implied by the approved 2023 and 2025 customer charges. |
| Sales tax | Applies the assumed tax rate to the forecast taxable charges. |
Assumptions and limitations
| Assumption | Effect on results |
|---|---|
| Contract-specific costs | Reactive-power charges, capacity-service riders, interim capacity service, optional programs, customer facilities, collateral, and exit fees are excluded. |
| Tax treatment | Customer exemptions and local taxes must be assessed separately. |
Public tariffs and regulatory filings
| Source | Coverage |
|---|---|
| LLPS tariff | Effective November 6, 2025. Service eligibility, voltage options, charges, demand measurements, minimums, and seasons. |
| KCC approval of the large-load tariff | Docket 25-EKME-315-TAR: approved service terms and contract-capacity minimum. |
| Energy Efficiency Rider order | Approved program recovery. Read with the program amendment. |
| Property Tax Surcharge filing | Property-tax recovery and billing quantities. |
| Transmission Delivery Charge filing | Transmission recovery, class allocation, and billing demand. |
| SPP transmission revenue forecast | June 2026 forecast of transmission revenue requirements. |
| Kansas Central 2025 FERC Form 1 | Assets, operating costs, depreciation, and sales. Companion Kansas South filing. |
| Kansas sales-tax guidance | State tax rate and local-rate treatment. |
Methodology version: October 2026. Results use real 2026 dollars.