Kilowatt Cost API — Electricity Rate Data

$ Rate Schedules

Query residential, commercial, and industrial rate schedules by jurisdiction. Get base charges, energy charges, demand charges, and tiered pricing.

Category	Schedules
Residential	`RS` `RSTC` `RE` `RETC` `ES` `RT`
Small General Service	`SGS` `SGSTC`
Large General Service	`LGS`
Industrial	`I`
Optional / TOU	`OPT-V`

⏳ Time-of-Use Periods

Find out the current TOU period (on-peak, off-peak, shoulder) for any schedule. Includes season detection, holiday handling, and daily profile breakdowns.

Schedule	Periods
Residential TOU	On-Peak · Off-Peak · Super Off-Peak
Business TOU	On-Peak · Shoulder · Off-Peak

⚡ Cost Calculator

Estimate monthly electricity cost given a schedule and kWh usage. Mandatory riders are applied automatically. Optionally include state & local taxes for a full bill estimate. Returns a detailed line-item breakdown with subtotal, taxes, and total.

+ Riders & Surcharges

14 mandatory riders (FC, EE, CPRE, BPM, CEPS, STS, STS2, and more) applied automatically per-kWh by category. 25 optional riders including solar (RSC, NM, NMB), green energy programs, and economic development incentives.

﹯ Tax Estimation

Estimate state and local taxes across all Duke Energy service territories. Supports NC, SC, IN, FL, OH, and KY — including state sales tax, gross receipts tax, per-kWh excise tax, and municipal/county-level local taxes for 50+ municipalities.

State	State Tax	Local Tax
NC	3% sales	Franchise up to 3.09%
SC	6% sales	Local option 1–2%
IN	7% sales	—
FL	2.5% gross receipts	Public service up to 10%
OH	$0.00465/kWh excise	—
KY	6% sales	Franchise ~3%

⚖ Supported Jurisdictions

Currently supporting all six Duke Energy service territories across the southeastern and midwestern United States.

Code	Jurisdiction	States
`DEC`	Duke Energy Carolinas	NC, SC
`DEP`	Duke Energy Progress	NC, SC
`DEI`	Duke Energy Indiana	IN
`DEF`	Duke Energy Florida	FL
`DEO`	Duke Energy Ohio	OH
`DEK`	Duke Energy Kentucky	KY

Example API Call

See what the API returns. Click an endpoint to view request and response examples.

GET /rates GET /tou/now GET /rates/taxes POST /calculate/cost

Request

curl "https://api.kwcost.com/rates/DEC/residential/RS" \
  -H "Authorization: Bearer <token>"

Response

{
  "jurisdiction": "DEC",
  "category": "residential",
  "schedule": "RS",
  "name": "Residential Service",
  "charges": {
    "basic_facility_charge": {
      "amount": 14.00,
      "unit": "$/month"
    },
    "energy": {
      "amount": 0.117845,
      "unit": "$/kWh"
    }
  }
}