Budget billing goes up because it is an estimate, not a fixed price. The utility averages about 12 months of your past bills, then reviews that number on a schedule. If your usage rose, rates rose, or you built up an unpaid balance, the next review raises your monthly amount to catch up.
That can come as a shock. A flat bill feels like a promise. It was only ever an estimate.
The timing matters this year. The National Energy Assistance Directors Association projects that households will spend an average of $1,030 on home heating this winter. That is $82 more than last winter, an 8.7 percent jump. Higher actual bills feed straight into the next budget billing review.
Why Did My Budget Billing Go Up?
Four things can push the number higher. Often more than one is at work.
- Your usage went up. A hot summer, a cold winter, a new appliance or more people at home all raise the average.
- Rates went up. The same usage costs more, so the 12-month average climbs.
- You carried a balance. Each month the utility tracks the gap between what you used and what you paid. If you underpaid, that gap gets folded into the new amount.
- Your first amount was a guess. Without 12 months of history at your address, the starting number is an estimate. Duke Energy says it uses the previous occupant, or the area average for a newly built home.
The third reason is the easiest one to miss. It is also why the increase can look bigger than the rise in your actual bills.
The Math Behind a Budget Billing Increase
Here is a simple example. The numbers are made up to show the mechanics. They do not come from any one utility.
| Step | Amount |
|---|---|
| Total actual bills last year | $1,800 |
| Budget amount you paid each month ($1,800 divided by 12) | $150 |
| Total actual bills this year | $2,040 |
| New 12-month average ($2,040 divided by 12) | $170 |
| Shortfall you built up ($2,040 minus $1,800) | $240 |
| Shortfall spread over 12 months | $20 |
| New budget amount ($170 plus $20) | $190 |
Actual bills rose about 13 percent. The budget amount rose about 27 percent. The extra comes from paying back last year while also paying for this year. Once the shortfall is cleared, that extra $20 can drop off. The higher average stays until usage or rates fall.
Mortgage escrow runs on almost the same yearly catch-up math:
You Paid the Escrow Shortage in Full. Your Payment Still Went Up. Here Is Why.
How 6 Big Utilities Recalculate Budget Billing
The rules are not the same everywhere. These six utilities come up again and again in searches about budget billing. Each row below comes from the program page of the company itself, checked on October 2, 2026.
| Utility | Starting amount | How often it changes | What happens to the running balance |
|---|---|---|---|
| PG&E | Average of the previous year of energy costs | Every month, using a 12 to 13 month rolling average | 1/12 of any balance or credit is applied to each monthly bill |
| Duke Energy | Average of the last 12 months of actual bills | Every 3 months | The deferred balance is included in each recalculation |
| Dominion Energy (Virginia) | Average of the past 12 months of bills | Normally every 12 months | Any amount owed or overpaid is spread over the next 12 months |
| ComEd | Average of 12 months of past usage | After the first few months, then every 3 months | Past differences are billed if you unenroll |
| FPL | Average of up to 12 months of recent usage | Every month, as a rolling 12-month average | The deferred balance is applied gradually to future bills |
| BGE | Average of 12 months of past usage | Every 3 months, with a reset every year | The yearly reset reflects any balance due or credit |
Programs can differ by state and can change. The terms on your own account are the final word. The six utilities fall into three patterns.
Budget Billing at Duke Energy, ComEd and BGE: The Quarterly Check
These three look at your account every three months. Duke Energy says the amount is recalculated every three months to reflect the last 12 months of actual bills plus the deferred balance. The first amount stays in place for at least three months.
ComEd says it reviews usage after the first few months, then every three months. BGE runs the same quarterly review and also resets the amount after 12 months.
A quarterly review means smaller steps, more often. A change can land right after an expensive season. BGE adds one detail. It pays interest of 0.5 percent per month on any credit balance and includes it in the June bill.
Budget Billing at PG&E and FPL: The Rolling Monthly Average
PG&E and FPL do not wait for a review date. Each month the newest bill goes into the average and the oldest one drops out. FPL describes it as a rolling 12-month average. PG&E uses a 12 to 13 month rolling average and applies 1/12 of any balance or credit to each bill.
So the amount is not truly flat. It moves a little every month. The upside is that the balance gets worked off as you go. PG&E says the monthly update is meant to keep a large balance from building up.
Dominion Energy: One Reset a Year
Dominion Energy in Virginia says the payment is normally recalculated every 12 months. That keeps the payment steady for a full year. The trade-off is that a whole year of differences lands in one review.
If you underpaid, the difference can be added to the recalculated amount for the next 12 months. If you overpaid, the credit is applied the same way.
One more rule matters for renters and movers. If you move to a new address, Dominion unenrolls the account and the entire balance comes due. You cannot reenroll until you have 12 months of usage at the new address.
The bigger forces behind rising power prices are covered here:
Why Your Electric Bill Keeps Going Up in 2026 (And What You Can Actually Do About It)
Is Budget Billing Worth It for Electric or Gas?
Budget billing does not save money. BGE states plainly that it does not reduce overall charges. PG&E says customers pay only for what they use.
What the program can do is smooth out the seasons. That may help if a January or August bill is hard to cover in one hit. It may be less useful if your electric or gas bills are already even from month to month.
It can also hide a problem. A flat payment makes it easy to miss that usage is creeping up. The actual usage still prints on the bill each month. BGE and ComEd both say so. It is easy to stop reading it.
So is budget billing a good idea? It depends on what you need. If the goal is a predictable payment, it can make sense. If the goal is a lower bill, it will not deliver that.
Writing the actual charge next to the budget amount each month shows the gap before the utility does. There is a free tracker for logging each utility bill next to your budget amount if you want a place to start.
What You Can Do When Your Budget Billing Goes Up
A few steps are worth taking before the next bill. None of them cost anything.
- Find the running balance. Duke Energy and FPL call it a deferred balance. It may be a credit or a debit. A large debit can explain a sudden jump.
- Ask for the math. The utility can show how the new amount was calculated and what balance was included.
- Look for a rate change. A notice from your utility or state regulator can explain a jump that your usage does not.
- Compare three months. Put the actual charges next to your budget amount. If actual charges are higher, the gap is still growing.
- Cut usage before the next review. The amount follows a 12-month average. Lower bills now pull the next number down.
- Know your exit cost. BGE and ComEd both say customers can unenroll at any time. The balance still has to be paid, as the last section shows.
A growing debit balance is an early signal. It can mean the next review will raise the amount.
Another monthly bill that climbs while the plan price stays put:
AT&T and T-Mobile Both Raised Phone Bill Fees in 2026. Your Plan Price Never Moved.
What Happens If You Leave Budget Billing
Leaving does not erase the balance. FPL adds or credits the remaining deferred balance on the next bill. PG&E shows the remaining balance or credit on the next energy statement. ComEd bills the regular amount plus any past differences. BGE charges the current month in full plus any payoff balance. Dominion makes the entire balance due when you move.
The Duke Energy program page does not describe this step. It is worth asking before canceling.
There can also be a wait to come back. FPL says customers may re-enroll after 12 months. PG&E removes customers after two consecutive underpayments and blocks re-enrollment for six months. Duke Energy says past due balances may be cause for removal for a 12-month period.
So leaving in a high-balance month can mean one large bill. Leaving while you hold a credit works the other way.
When is your next budget billing review, and do you know what balance is waiting in it?
Disclaimer: MoneyWisePro is not a utility company or financial advisor. This article is for general information only and is not financial or legal advice. Contact your utility or your state public utility commission for guidance on your specific situation.
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