An electric tariff is the official, regulator-approved document that spells out exactly what your utility can charge you, how it delivers service, and what rules govern the relationship between you and the power company. Understanding how electric tariffs work matters because every rate on your monthly bill, every surcharge, and every service condition traces back to this document, which your state’s public utility commission (or the federal government, for wholesale power) must approve before it takes effect. With the average U.S. residential electricity price sitting around 17.83 cents per kilowatt-hour as of early 2026, knowing what drives that number puts you in a better position to manage your costs and challenge billing errors when they come up.1U.S. Energy Information Administration. Electric Power Monthly – Table 5.6.B
What’s Actually on Your Bill
Your monthly statement isn’t one lump charge. It’s built from several tariff line items, each covering a different piece of the energy supply chain.
The first is usually a fixed customer charge covering administrative overhead like metering, billing, and customer service. For residential accounts this typically falls somewhere between $10 and $25 per month regardless of how much electricity you use. You’ll pay it even if you’re away on vacation and consuming nothing.
After the fixed charge, variable charges kick in based on your actual consumption. These split into three categories. Generation covers the cost of producing electricity at a power plant, including fuel, plant maintenance, and the utility’s return on its generation investments. Transmission is the expense of moving high-voltage power across long-distance lines from generating stations to your local area. Distribution covers the local network of poles, wires, and transformers that bring electricity from the transmission system to your meter.
On top of these, tariffs include riders and surcharges that let the utility adjust your bill without filing an entirely new rate case. The most common is a fuel adjustment clause, which passes through changes in the cost of natural gas, coal, or purchased power on a monthly basis. When fuel prices spike, your bill rises through this rider; when they drop, the adjustment works in reverse. Environmental compliance surcharges also appear on many bills, recovering costs the utility incurs to meet Clean Air Act requirements or state renewable energy standards.2US EPA. Clean Air Act Standards and Guidelines for Electric Utilities
The Rate Structure Applied to Your Usage
The tariff doesn’t just list component costs. It defines the mathematical formula for applying those costs to your usage, and that formula can change your bill meaningfully even if your total consumption stays the same.
Flat and Tiered Rates
The simplest approach is a flat rate: one price per kilowatt-hour no matter how much you use. It’s easy to predict, which is why many utilities default residential customers to it. A tiered or block rate structure changes the per-unit price at certain usage thresholds. In an inverted block design, the price per kilowatt-hour increases as consumption climbs, pushing heavier users to conserve. A declining block structure does the opposite, lowering the unit cost as volume grows. That approach shows up more often in industrial tariffs, where the utility wants to encourage steady, high-volume load.
Time-of-Use Rates
Time-of-use rates tie the price of electricity to when you use it rather than just how much. Power consumed during peak afternoon and early evening hours costs significantly more than electricity used overnight or on weekends. The spread can be substantial, with peak rates roughly two to three times higher than off-peak rates in common designs. These tariffs reward customers who can shift laundry, dishwashing, or EV charging to cheaper hours. Many utilities now make time-of-use the default for new customers, though some let you opt out to a flat-rate plan. If you do switch, you may be locked into your chosen structure for a minimum period, often 12 months, before switching again.
Demand Charges
Commercial and industrial tariffs typically include a demand charge alongside the per-kilowatt-hour energy charge. Where energy charges measure total consumption over the billing period, demand charges measure the highest average load you drew during any single 15-minute interval. If your business runs heavy equipment that creates sharp spikes in electricity draw, that single peak sets your demand charge for the entire month. This reflects a real cost: the utility must maintain enough generation and distribution capacity to serve your worst-case load, even if it only lasts a few minutes. Businesses that can flatten their usage profile through load scheduling or battery storage often see meaningful savings here.
Real-Time Pricing
A smaller but growing category of tariffs offers real-time pricing, where rates update hourly based on wholesale market conditions. Rather than paying a predetermined schedule, you see prices that reflect the actual cost of generating and delivering power at that moment. This requires a smart meter capable of recording usage in short intervals and transmitting that data back to the utility. Real-time pricing offers the most potential savings for customers who can aggressively shift consumption, but it carries more risk. A heat wave that sends wholesale prices soaring will hit your bill hard if you can’t reduce usage during those hours.
Which Customer Class You’re In
Utilities don’t apply the same tariff to every customer. They sort accounts into classifications based on how much power the customer uses and the infrastructure required to serve them. Getting assigned to the wrong class means you’re paying rates designed for a different type of user.
The residential classification covers single-family homes and small apartment buildings. Commercial classifications apply to businesses like offices, retail stores, and restaurants that draw more power than a typical household but don’t need specialized high-voltage infrastructure. Industrial tariffs serve large manufacturing operations, data centers, and similar facilities that often take delivery at medium or high voltage levels, bypassing some of the distribution system that serves smaller customers. Taking power at higher voltage typically earns a lower per-unit rate because the utility avoids the cost of stepping it down.
Specialized classifications also exist for agricultural operations that run irrigation pumps on seasonal schedules, municipal street lighting, and government buildings. Eligibility usually depends on annual consumption volume, the voltage level at which service is delivered, and sometimes the type of activity conducted at the premises. If your business grows past the threshold for its current classification, the utility may reclassify you, which can substantially change your rate structure.
Who Approves These Rates
Two layers of government regulate electric tariffs, and the dividing line between them is the distinction between wholesale and retail power sales. The Federal Energy Regulatory Commission oversees rates for wholesale electricity sales and transmission in interstate commerce.3Federal Energy Regulatory Commission. Electric Any time a power generator sells electricity to a utility rather than directly to an end user, or power moves across state lines on the transmission system, FERC-approved tariffs govern the transaction. Federal law requires every public utility engaged in these wholesale or interstate transmission sales to file its rate schedules with FERC and keep them available for public inspection.4Office of the Law Revision Counsel. 16 USC 824d – Rates and Charges; Schedules; Suspension of New Rates
State public utility commissions handle the retail side, regulating the rates that utilities charge homes and businesses. Your retail tariff reflects costs flowing down from FERC-regulated wholesale markets, layered with state-approved distribution costs and policy charges. When wholesale transmission costs rise because of new infrastructure investment approved by FERC, that increase eventually reaches your bill through the state-regulated retail tariff. That’s part of why rate increases sometimes originate far from your local utility’s operations.
How a Rate Case Works
A utility can’t just decide to raise your rates. It must file a rate case with the state public utility commission and prove the increase is justified. The case begins when the utility submits an application supported by financial testimony, cost studies, and projections showing why its current rates no longer cover the cost of providing service. The utility carries the burden of proving that every dollar of its requested revenue is just and reasonable.5eCFR. 18 CFR Part 35 – Filing of Rate Schedules and Tariffs An administrative law judge typically presides over hearings where commission staff, consumer advocates, and other parties cross-examine the utility’s witnesses and present their own evidence. The process commonly takes six to ten months from filing to final order.
Most commissions allow customers to submit written comments, attend public hearings, or testify about how a proposed change would affect them. For more formal involvement, you can petition to intervene, which gives you the right to participate in discovery, file testimony, and cross-examine witnesses. Many states also have a consumer advocate or ratepayer counsel office that represents residential customers in every rate case.
Your Rights Under the Tariff
Tariffs don’t just set prices. They establish the rules utilities must follow before taking action against you.
Once the commission issues its decision, the resulting tariff becomes a legally binding document. The utility must charge exactly the approved rates, no more and no less. Deviating from the filed tariff can trigger regulatory penalties and exposes the utility to litigation from overcharged customers. This “filed rate doctrine” is one of the strongest consumer protections in utility law: the price in the tariff is the price.
Disconnection Protections
Before a utility can shut off your power for nonpayment, it must provide advance written notice, typically at least 10 days before the proposed shutoff date. Most states also require additional contact attempts, by phone or in person, shortly before disconnection. Beyond these baseline requirements, 42 states have cold-weather disconnection protections that restrict or prohibit shutoffs during winter months when loss of heat could endanger health or safety. Separate medical necessity protections exist in most states for households where a resident depends on electrically powered medical equipment; qualifying usually requires a physician’s certification.
Late Payments and Reconnection
Late payment penalties are spelled out in the tariff and typically range from 1% to 5% of the overdue balance per billing period. If your power does get disconnected, reconnection fees apply and vary widely by utility. These fees, along with the specific payment arrangements the utility must offer before resorting to disconnection, are all governed by the tariff and your state commission’s rules. If you believe a fee was applied incorrectly, the tariff is the document you’ll reference when filing a complaint.
How to Find and Read Your Tariff
Your utility’s tariff is a public document, and you have the right to inspect it. Most utilities post their complete tariff schedules on their websites, usually under a “rates” or “regulatory filings” section. Your state public utility commission’s website also maintains copies of all approved tariffs. For wholesale and transmission tariffs regulated by FERC, the commission maintains a searchable public tariff viewer at etariff.ferc.gov.6Federal Energy Regulatory Commission. View Individual Tariffs
Tariff documents can run hundreds of pages and read like they were written by lawyers for lawyers, because they were. Start by finding your customer classification, usually listed at the top of the rate schedule. Then look at the specific rate schedule code on your monthly bill, which will match a section in the tariff. Compare the line items on your bill to the charges listed in that schedule. If the numbers don’t match, or a charge appears that isn’t in the tariff, that’s grounds for a billing dispute with the utility or a formal complaint to your commission. The tariff is the single source of truth for what you should be paying.