Natural gas futures fall. Your electric bill’s fuel adjustment line rises. That is not a billing error. It is four separate clocks running at different speeds, and the total lag is their sum, not a single published number.
The fuel adjustment clause — also called a fuel cost recovery rider, energy cost recovery rider, or purchased power adjustment — is the line item that lets a regulated utility pass through the cost of the fuel and purchased power it actually bought, without reopening a full base rate case. It is a pass-through, not a markup. The utility does not earn a margin on the commodity. It earns a margin on the delivery system. The rider exists to close the gap between the fuel cost assumed in base rates and what the utility actually spent.
Because the rider is based partly on a forecast, it is almost always wrong in one direction or the other. Commissions require a true-up: a later filing that compares what the utility actually spent on fuel to what it collected from customers through the rider, and adjusts the next period’s charge to make up the difference, plus interest. That true-up is one of the four clocks. The other three are procurement, storage, and billing.
The four clocks, and the document that sets each one
The four-clock frame is an organizing device, not a measured decomposition. No single source assigns a duration to each clock. What the frame does is tell you which document to pull when you want to know why your bill moved.
Procurement. A utility does not buy all its winter gas the day before a cold snap. It buys through a portfolio: monthly baseload, seasonal strips, storage hedges, spot purchases. The document that sets this clock is the utility’s procurement plan and its filed purchased gas or fuel cost adjustment, which shows the actual cost period and the projected period behind the factor. If the factor is based on November and December costs, a February futures move is not in it.
Storage. Gas injected in the summer at one price is withdrawn in January at another. The customer pays the weighted average cost of the gas withdrawn, not the current spot price. The document that sets this clock is the utility’s storage and hedging filing, plus the EIA’s weekly working gas in storage report. The inventory cycle is one reason retail prices trail wholesale prices.
Regulatory review. Most commissions approved a fuel adjustment mechanism once, as a formula and a filing schedule, and now review it on a much lighter annual or semiannual cycle that mostly checks the arithmetic rather than the whole rate structure. The document that sets this clock is the commission order or rule that establishes the adjustment frequency and the effective date of each new factor. Michigan law, for example, requires notice and an opportunity for a full and complete hearing before rates are increased based on changes in the cost of fuel, purchased gas, or purchased steam, and directs the commission to authorize recovery only to the extent the purchases are reasonable and prudent. Michigan also abolishes adjustment clauses that operate without notice and an opportunity for a full and complete hearing. That is a different mechanism from a pure pass-through, and it is worth knowing which one your state uses.
Billing. Your meter is read once a month. The usage in that reading is multiplied by the adjustment factor in effect on the reading date. The gas you used on the first day of the cycle is priced at the same factor as the gas you used on the last day. The bill arrives after the reading. The document that sets this clock is your own statement: the meter read date and the factor printed on the rider line.
What the EIA publishes, and what it does not
The U.S. Energy Information Administration publishes a monthly Electric Power Monthly series on the average cost of natural gas delivered for electricity generation, broken out by state, and a companion series on receipts of natural gas delivered for electricity generation by state. Those tables are the reference series to compare against your own adjustment factor.
They are also aggregates across many utilities and procurement portfolios. They cannot tell you what your own adjustment factor will be. Use them as a sanity check on direction and magnitude, not as a one-to-one mapping.
For context on the wholesale side, the EIA reported that the Henry Hub natural gas spot price averaged $2.93 per million British thermal units from June through August 2026, 6% less than the same period a year earlier. It also reported that U.S. natural gas production hit an all-time high in July 2026, driven primarily by increased output in the Permian Basin, and that low-cost Appalachian and Canadian supply coupled with lower-than-usual regional consumption pushed prices at a major New England hub to trade near record discounts to Henry Hub. Those are market conditions. They are background for your next statement, not the input to it.
On the retail side, the American Gas Association, citing EIA Short-Term Energy Outlook data, reports 2024 average residential prices of $14.00/MMBtu for natural gas and $48.30/MMBtu for electricity — a 3.5x ratio — and notes that EIA projects the electric-to-gas ratio rising to 4.0x by 2027. The AGA also notes that STEO does not publish state-level price projections. That matters for this article: the national ratio is a useful frame, but your bill is set by your utility’s filed factor, not by the national average.
How to find your own clock
Stop reading the futures price as a forecast of your next statement. Read two documents instead.
- Your bill. Find the rider line, separate from the base energy or delivery charge, usually priced per kilowatt-hour on its own. Note the factor and the meter read date. Pull the last three months of factors.
- The utility’s most recent fuel or purchased gas cost filing. Most state commissions publish these online. Look for the actual cost period, the projected period, and the effective date of the new factor. That tells you which months of gas purchases are inside the number you are paying.
- The commission order or rule that sets the adjustment frequency. Monthly, quarterly, or annual true-up. This is the clock that determines how long a market move waits before it reaches a statement.
A useful exercise, presented as a method rather than a claim: pull the last three months of your adjustment factor from your own bills, pull the corresponding months from the EIA delivered-cost series, and note the offset that appears. That offset is your own combined lag. It will differ from a neighbor’s in a different state or on a different utility’s filing schedule.
What this means for budgeting
Budget against the adjustment factor in effect for your next billing cycle and the most recent filed cost data. Treat the current spot or futures price as context for the following periods rather than the current one. The rider is a balancing account, and balancing accounts always lag.
The same lag structure appears elsewhere in household finance. A card issuer reprices a variable-rate account on the first day of the billing cycle after the prime rate changes, not the day the Fed moves. The policy signal is immediate; the household cash-flow impact is delayed. For a closer look at that mechanism, see What a Rate Hold Actually Means for Credit Card Borrowers.
FAQ
Why did my bill go up when natural gas prices fell? Your bill reflects the cost of gas the utility bought earlier, not the current market price. Utilities buy through contracts, storage, and spot purchases, and the adjustment factor is based on those actual costs. A futures decline today shows up in the adjustment factor only after the next filing and billing cycle.
Does the utility profit from higher gas prices? Under a pass-through rider, no. The utility recovers the actual cost of fuel and purchased power, dollar for dollar, with no commodity margin. But not every state uses a pure pass-through. Michigan law, for instance, conditions recovery on prudence and requires notice and a hearing. Check your state’s mechanism rather than assuming.
Can I avoid the fuel adjustment clause by switching suppliers? In some deregulated markets, yes — a fixed-price contract embeds the supplier’s expectation of future fuel costs, so you pay the lag as a known fixed amount rather than a variable adjustment. In regulated states, you cannot avoid the clause, but you can reduce usage and shift consumption to off-peak periods if your utility offers time-of-use rates.
Where do I find my utility’s fuel cost filing? Most state public utility commissions publish filings and orders online. Search your commission’s docket system for your utility’s name plus “fuel adjustment” or “purchased gas adjustment.” The filing will show the actual cost period, the projected period, and the effective date.
Is the EIA delivered-cost series the same as my utility’s fuel cost? No. The EIA series is a national and state aggregate across many utilities and procurement portfolios. It is useful for direction and magnitude. It is not your utility’s ledger.
