Fuel Adjustment Charges: Cut Your Exposure

The floating line item on your electric bill is not a mystery. Here is how it works, why it swings, and what to track so it stops wrecking your budget.

Hosted by

Daniel Burke

A companion to

Episode 5 · Fuel Adjustment Charges: How to Reduce Your Exposure

Start here

Who this is for

■Plant managers and superintendents staring at a Fuel Adjustment or Fuel Rider line on their bill
■Facility managers, COOs, and energy managers at manufacturers, hospitals, schools, and large commercial sites
■Finance leaders trying to budget electricity when a variable line item keeps moving
■Operators weighing capital projects that touch electricity use over the next several years

The real question

How exposed are you to the Fuel Adjustment Charge on your bill, and what are you doing about it inside the walls you actually control?

01 First principles What a Fuel Adjustment Charge actually is

Fuel Adjustment Charges, sometimes called Fuel Cost Adjustment, Fuel Rider, or Purchased Power Adjustment, are variable per-kilowatt-hour line items on your bill. They pass through the difference between what your utility actually pays for fuel and purchased power and what was assumed inside base rates.

Base rates cover the fixed side: plants, poles, wires, transformers. Those get set in a formal rate case and stay in place for years. Inside that base rate, regulators and the utility agree on a base fuel cost, which is a forecast. Fuel prices do not sit still that long, so the rider corrects the gap.

Fuel Adjustment Charge (FAC)	Per-kWh rider that trues up actual fuel cost against the base fuel cost baked into rates
Fuel Cost Adjustment / Fuel Rider	Different names for the same mechanism, depending on the utility
Purchased Power Adjustment	Same idea applied to power the utility buys from other generators
Base fuel cost	The forecast fuel price built into base rates during a rate case

35%of this guide, read. The rest of it is below.

02 Mechanics How the rate is calculated and lands on your bill
1 Rate case sets a base fuel cost. The commission and utility agree on an expected fuel cost per megawatt-hour and bake it into base energy rates.

2 The utility tracks actual fuel and purchased power costs continuously. Natural gas, coal, oil, nuclear fuel, purchased power, all of it.

3 Every month or quarter, they compare actual fuel cost to what base rates would have recovered for fuel at that sales volume.

4 That difference gets divided by total kilowatt-hours sold in the period, producing a rate in cents per kilowatt-hour.

5 That rate multiplies your kilowatt-hours for the month and shows up as its own line: Fuel Adjustment Charge or Fuel Rider.

6 Regulators run prudence reviews to check that the fuel was procured in a reasonable, efficient way. 30 days

Pass-through, not profit

On paper this is a dollar-for-dollar pass-through. Utilities are not supposed to profit on fuel through this mechanism. You can argue about what prudent means and how they manage assets overall, but the rider itself is not designed as a margin line.

What a small rate move looks like at scale

2¢/kWh

FAC rate increase

10,000,000kWh/month

Facility monthly consumption

200,000$

Added to the monthly bill

2,400,000$

Unbudgeted over a year

A modest per-kilowatt-hour swing turns into serious money for anyone consuming millions of kilowatt-hours per month.

Define

Prudence review: regulator's check on whether fuel procurement decisions were reasonable and efficient at the time they were made.

The number

30 days

Riders can be adjusted administratively on roughly this cycle, without reopening a rate case.

Ask them

Ask finance: if our FAC rate moved by a cent or two per kWh, what would that do to our monthly and annual electricity spend on current volumes?
03 What it does to you Budget volatility, lag, and no direct control

The single biggest problem with fuel adjustment charges is budget volatility. When you build a budget for electricity, you are not just budgeting the base energy rate and the demand charges. This floating per-kilowatt-hour line item can move from a modest share of your bill to a very large one, depending on territory and rate.

How large a share of the bill the rider can be

The FAC is not a fixed slice. It ranges from a small line item to a dominant one, and sources report cases running even higher.

Real-world spike

We have seen a period where cost of fuel adjustment increased by nearly three thousand percent on a specific rate, adding almost three cents per kilowatt-hour on top of everything else. Customers on that rate did not suddenly become worse operators. They happened to be standing in the wrong place when certain decisions met certain markets.
We have seen a real‑world period where the cost of fuel adjustment on a specific rate went up by nearly three thousand percent, adding almost three cents per kilowatt‑hour on top of everything else.

Pain 1

Pricing your product

When a variable cost sits inside your all-in electricity rate, it gets harder to set stable prices for what you sell.

Pain 2

Capital project math

If your payback model uses only the base energy rate, you are ignoring the floating slice that can dominate the bill.

Pain 3

The lag effect

The rider you see this month often reflects fuel costs from a prior period. You are responding to a history lesson, not to today.

The number

50%

Sources cite FAC share of bill as high as this upper bound in some territories.

The number

2,999%

Observed increase in FAC on one utility rate over a single period.

The number

3 ¢/kWh

Cents per kilowatt-hour that spike added on top of everything else.
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03 What it does to you Budget volatility, lag, and no direct control

The single biggest problem with fuel adjustment charges is budget volatility. When you build a budget for electricity, you are not just budgeting the base energy rate and the demand charges. This floating per-kilowatt-hour line item can move from a modest share of your bill to a very large one, depending on territory and rate.

How large a share of the bill the rider can be

The FAC is not a fixed slice. It ranges from a small line item to a dominant one, and sources report cases running even higher.

Pain 1

Pricing your product

When a variable cost sits inside your all-in electricity rate, it gets harder to set stable prices for what you sell.

Pain 2

Capital project math

If your payback model uses only the base energy rate, you are ignoring the floating slice that can dominate the bill.

Pain 3

The lag effect

The rider you see this month often reflects fuel costs from a prior period. You are responding to a history lesson, not to today.

04 Myths that cost money What operators get wrong about the FAC

What operators say	What is actually true
The utility is getting rich off this line item.	Under a standard mechanism, the utility recovers actual, prudent fuel costs dollar for dollar. Commissions review those numbers in detail. It is not designed as a margin line.
This is a hidden fee.	It may be buried in small print, but the mechanism is spelled out in the tariff, which is public.
My utility could just buy cheaper fuel if they wanted to.	They operate under reliability requirements and long-term contracts. They cannot cancel everything and buy whatever is cheapest today.
If I go renewable, the FAC disappears.	On-site generation reduces exposed kilowatt-hours. As long as you are connected to a grid that leans on fuels, any power you buy from it carries some version of this rider.
The FAC is just a fixed percentage of my bill.	It is a rate per kilowatt-hour. Its share of your total bill depends on how high that rate is and how many kilowatt-hours you used.
I can opt out.	In regulated markets, this is a standard component of the tariff for bundled service customers. You typically cannot opt out.

04 Myths that cost money What operators get wrong about the FAC

What operators say	What is actually true
The utility is getting rich off this line item.	Under a standard mechanism, the utility recovers actual, prudent fuel costs dollar for dollar. Commissions review those numbers in detail. It is not designed as a margin line.
This is a hidden fee.	It may be buried in small print, but the mechanism is spelled out in the tariff, which is public.
My utility could just buy cheaper fuel if they wanted to.	They operate under reliability requirements and long-term contracts. They cannot cancel everything and buy whatever is cheapest today.
If I go renewable, the FAC disappears.	On-site generation reduces exposed kilowatt-hours. As long as you are connected to a grid that leans on fuels, any power you buy from it carries some version of this rider.
The FAC is just a fixed percentage of my bill.	It is a rate per kilowatt-hour. Its share of your total bill depends on how high that rate is and how many kilowatt-hours you used.
I can opt out.	In regulated markets, this is a standard component of the tariff for bundled service customers. You typically cannot opt out.

05 Your leverage Track it, size it, and lower exposed kilowatt-hours

You cannot control global fuel markets and you cannot opt out of the mechanism. You can do three things: understand how exposed you are, track the behavior of that line item over time, and deliberately reduce the number of kilowatt-hours that are exposed to it.

Tracking checklist

What to put on the spreadsheet this month

1 Log the fuel adjustment rate in cents per kilowatt-hour every month. Look at it across twelve months and then across several years.
2 Calculate what percentage of your total electricity bill the FAC line represents every month.
3 Write down your utility's generation mix. Heavy natural gas, coal, nuclear, hydro, renewables. The more concentrated in a volatile fuel, the more sensitive your rider.
4 Track the basic commodity trends tied to that mix. If your utility leans on natural gas, keep a rough eye on forward gas prices.
5 Pull historical FAC data across a multi-year window to see where the rider usually sits and where the extremes have been. 10 years

Why the commodity view matters

When the forward curve for the fuel your utility leans on doubles, you should expect the rider on your bill to move.

05 Your leverage Track it, size it, and lower exposed kilowatt-hours
You cannot control global fuel markets and you cannot opt out of the mechanism. You can do three things: understand how exposed you are, track the behavior of that line item over time, and deliberately reduce the number of kilowatt-hours that are exposed to it.

Tracking checklist

What to put on the spreadsheet this month

1 Log the fuel adjustment rate in cents per kilowatt-hour every month. Look at it across twelve months and then across several years.

2 Calculate what percentage of your total electricity bill the FAC line represents every month.

3 Write down your utility's generation mix. Heavy natural gas, coal, nuclear, hydro, renewables. The more concentrated in a volatile fuel, the more sensitive your rider.

4 Track the basic commodity trends tied to that mix. If your utility leans on natural gas, keep a rough eye on forward gas prices.

5 Pull historical FAC data across a multi-year window to see where the rider usually sits and where the extremes have been. 10 years

Why the commodity view matters

When the forward curve for the fuel your utility leans on doubles, you should expect the rider on your bill to move.

Bottom line

You cannot make fuel adjustment charges disappear, but you can stop being surprised by them. Track the rate, know its share of your bill, and work to lower the kilowatt-hours exposed to it. That turns a mystery into one more variable you manage with intention.
The bottom line on Fuel Adjustment Charges and Riders is this: you cannot make them disappear, but you can stop being surprised by them.

The number

10 years

Recommended historical window for FAC pattern analysis.

Define

Forward curve: market pricing today for a commodity delivered in future months. A leading indicator for where your rider is heading.

Ask them

Ask your energy partner: when we model this project's payback, are we using only the base energy rate, or are we including the floating fuel adjustment slice?
Decision matrix

When to actively work the FAC lever
✓ Worth the effort now

The FAC line is a meaningful and moving share of your monthly bill

You are evaluating capital projects or new loads that will run for years

Your utility leans heavily on a volatile fuel like natural gas

Finance is being surprised by the electricity number more than once a year

You do not have a graph of the FAC rate or its share of the bill anywhere

✗ Not the priority yet

You have no historical bills or interval data to work from yet

Electricity is a trivial line in your total operating cost

You are already mid-flight on a broader tariff or supply review that will surface this anyway

The rider has been small and stable for years on your rate and mix
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Decision matrix

When to actively work the FAC lever
✓ Worth the effort now

The FAC line is a meaningful and moving share of your monthly bill

You are evaluating capital projects or new loads that will run for years

Your utility leans heavily on a volatile fuel like natural gas

Finance is being surprised by the electricity number more than once a year

You do not have a graph of the FAC rate or its share of the bill anywhere

✗ Not the priority yet

You have no historical bills or interval data to work from yet

Electricity is a trivial line in your total operating cost

You are already mid-flight on a broader tariff or supply review that will surface this anyway

The rider has been small and stable for years on your rate and mix
Questions for your morning huddle

Over the last twelve months, what has our Fuel Adjustment Charge been each month in cents per kilowatt-hour, and do we have it graphed anywhere?

For each of those months, what percentage of our total electricity bill was the Fuel Adjustment Charge?

Do we have a clear summary of our utility's generation mix and which fuels drive most of our fuel adjustment behavior?

When we evaluate energy projects or new loads, are we accounting for the portion of our cost that floats with fuel adjustment, or only the base energy rate?
The one thing to remember

You cannot control the fuel market and you cannot opt out of the rider, but you can stop being surprised by it. The first move is not a project. It is visibility on the line item itself.

Open the last twelve bills. Log the FAC rate in cents per kilowatt-hour and its share of the total bill each month. Bring that single sheet to your next huddle with finance.
The Energy Decision Blueprint

Know if the numbers actually pencil out before you sign anything.

A written second opinion on the project in front of you, whether that is a rate change, new equipment, or a renewable installation.

01A short call, to figure out quickly whether we can actually be helpful. If we can't, we'll say so on the spot.
02We pull the data, your bills, your rate structure, vendor proposals, project specs.
03You get the verdict in writing: whether the payback will materialize, and the opportunities or risks nobody has raised.

Get a Blueprint at blueprint.tac-nrg.com Free for Indiana-based operations spending five figures or more a month on electricity. No obligation. You keep the write-up either way.
Glossary

Fuel Adjustment Charge (FAC)

Variable per-kilowatt-hour line item that passes through the difference between actual fuel and purchased power cost and the base fuel cost baked into rates.

Fuel Rider

Another common name for the FAC. Same mechanism, different label depending on the utility and tariff.

Purchased Power Adjustment

A rider that trues up the cost of electricity the utility buys from other generators, functionally similar to the FAC.

Base rate

The fixed portion of your electricity rate that covers plants, poles, wires, and transformers. Set in a rate case and stable for years.

Base fuel cost

The forecast fuel cost built into base rates during a rate case. The FAC measures actual fuel cost against this benchmark.

Rate case

The formal, lengthy regulatory process where base rates are reset. Riders exist so this does not have to happen every time fuel prices move.

Prudence review

The regulator's check on whether the utility's fuel procurement decisions were reasonable and efficient. The basis for allowing costs into the rider.

Generation mix

The set of fuel and resource types a utility uses to generate power. Determines which commodities your FAC is most sensitive to.

Forward curve

Market pricing today for a commodity like natural gas delivered in future months. A leading indicator for where the fuel adjustment rider is heading.
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