Last reviewed: 22 October 2026. This page explains how to read electricity tariff sources and the limits of our bill estimates. It is not a statement that every calculator on this website has been independently validated against the latest order. Some older profiles are being reviewed.
How electricity bill estimates work
An electricity bill estimate generally begins with units consumed (kWh) during the billing period. The applicable electricity distribution company (DISCOM), tariff category, sanctioned load and billing cycle determine which charges may apply. Many tariffs use consumption slabs; however, not all categories or states use the same slab rules.
- Identify the provider and category. Check your actual bill for the state, DISCOM, tariff code, connected or sanctioned load, and whether the account is domestic, commercial, agricultural or another category.
- Identify the billing period. A 30-day estimate is not interchangeable with a 60-day or bi-monthly bill.
- Apply the correct energy tariff. Some schedules are progressive by slab; other schedules specify category-specific rates, minimum charges or different treatment above a threshold.
- Add fixed and demand charges where applicable. These may depend on sanctioned load, connected load, contract demand or the type of supply.
- Account for changing adjustments. Fuel and power-purchase adjustment charges, taxes, rebates, subsidies, arrears, late-payment amounts and solar settlement vary by DISCOM and period.
- Compare the result with your bill. A calculator is an estimate and not an official invoice.
Official tariff and utility source directory
Start with the regulator’s published order, then check the utility’s rate schedule, public notices and monthly adjustments. These links lead to primary-source repositories, not an assertion that every rate on our site matches the latest document.
| Area | Official source | What to verify |
|---|---|---|
| Uttar Pradesh | UPERC tariff orders and UPPCL tariff details | FY 2026-27 schedule, correct LMV category, fixed charge, applicable FPPAS and duty |
| Andhra Pradesh | APERC tariff orders | FY 2026-27 retail tariff and any adjustment or corrigendum |
| Maharashtra | MSEDCL tariff documents | March 2026 order, category slabs, fixed/demand charges and adjustments |
| Tamil Nadu | Tamil Nadu Electricity Regulatory Commission | Effective LT tariff, state subsidy orders, eligibility, bi-monthly rules and any subsequent revision |
Different utility service territories may have separate orders. For example, Greater Noida/NPCL is not necessarily covered by a standard UPPCL state-DISCOM tariff. A source document from one financial year must not be applied automatically to another year.
2026 tariff and subsidy corrections to check
Uttar Pradesh (FY 2026–27): The UPPCL public notice lists a domestic urban metered payable rate of ₹5.50/unit up to 150 units, ₹6.00 for units 151–300 and ₹6.50 above 300, with ₹110/kW/month fixed charges. The standard rural metered domestic schedule uses ₹3.35, ₹3.85, ₹5.00 and ₹5.50 across the bands 0–100, 101–150, 151–300 and above 300, with ₹90/kW/month fixed charges. These are payable consumer rates and exclude separate periodic bill adjustments. See our verified FY 2026–27 UPPCL rate guide and the UPPCL official public notice (PDF).
Tamil Nadu (from 10 May 2026): Under G.O.(Ms) No. 50, eligible domestic consumers using up to 500 units over two months can receive 200 free units. Those using more than 500 units continue under the previous structure including the 100-free-unit benefit. This is a bi-monthly allowance, not 200 units per month. Read our Tamil Nadu 200 free units eligibility guide. The Tamil Nadu calculator pages may still show earlier assumptions and should not be treated as verified until their underlying logic is updated.
What our estimates may not include
Depending on the individual calculator, an estimate may omit or simplify government subsidy eligibility, time-of-day rates, fuel surcharges, fixed/demand charges, minimum billing amounts, electricity duty, arrears, rebates, late fees and solar net-billing or net-metering settlement. Only fields actually shown in a particular calculator should be assumed to affect its result. Verify each factor against your provider’s bill and published order.
How to verify your bill independently
- Locate the consumer number, tariff code, billing dates, meter readings and units used on the original utility bill.
- Open the official regulator or DISCOM source above and find the tariff schedule applicable to those dates.
- Check whether the order shows a base tariff, a subsidized consumer-payable tariff, or both. Do not subtract a subsidy twice.
- Confirm separate monthly or periodic surcharges, including fuel/power-purchase adjustments, using DISCOM notices.
- Compare the estimated amount component by component. If the difference remains unexplained, contact the official utility.
Corrections, updates and editorial standards
We review source links and individual rate assumptions when a discrepancy is identified. Tariff orders, government subsidy notifications and utility notices take precedence over older summaries and generic rate tables. A published year in a calculator title does not by itself prove that all its inputs reflect the current year. We do not guarantee a fixed number of days for tariff revisions to appear on the website.
To report a potential error, please use our contact page. Include the calculator URL, DISCOM, tariff category, effective date, and a public link to the relevant order or notice. Do not submit account passwords, OTPs, or full personal bills. You can also read our editorial policy and disclaimer.