Demand Ratchets: One Peak, A Year of Cost
A ratchet turns one bad interval into twelve months of minimum billing. This guide shows you how it works, why metered and billed demand differ, and what to track so you can stop treating it like black magic.
Who this is for
- ■Plant managers, facility managers, and superintendents on a ratcheted utility rate
- ■COOs, CFOs, and energy managers who see demand charges eating the bill
- ■Operators at manufacturers, hospitals, school systems, and cold storage
- ■Anyone whose metered demand and billed demand are two different numbers
How do I manage facility demand to avoid punitive ratchet charges without contorting the whole operation around the rate book?
A demand ratchet is a billing method the utility applies to larger commercial and industrial customers. Instead of billing you for this month's peak and resetting the clock, the ratchet remembers your highest peak over a look-back window and uses a percentage of that as the minimum it will bill you for going forward.
Demand is measured in kilowatts. On your bill, that is the capacity you proved you can ask the grid to deliver during the highest interval, typically between 15 minutes and 30 minutes, in a billing period.
| Parameter | Typical value |
|---|---|
| DOE typical ratchet percentage | 80% |
| Typical look-back window | 11 months |
| Annual / rolling look-back | 12 months |
| Prevalent ratchet in Daniel's market | 70% |
32%of this guide, read. The rest of it is below.
- 02 The mechanism How the greater-of-two calculation runs
Say you hit a peak once and never repeat it. With a ratchet, that single interval reaches forward into every subsequent bill until either you set a higher peak or the old one falls out of the look-back window.
One event, a year of floor1,000kWone peak event75%ratchet percentage750kWminimum billed demand500kWactual monthly demandA single peak sets a minimum billed demand that persists for the full look-back window.Same mechanic, different windowsThe three variants
MonthlyRolling look-back
Billing demand each month is the greater of this month's peak or a percentage of the highest metered demand in the previous months, often creating a rolling one-year window.SeasonalOne season dictates the rest
A summer peak can set the minimum billed demand for the non-summer months. Cold storage, agricultural processing, and seasonal manufacturing feel this hardest.AnnualOne year, one floor
The highest peak in a defined twelve-month period sets the minimum billed demand for the entire following year.Metered versus billed across the yearBilled demand tracks the ratchet floor even when actual metered demand drops well below it. From the utility side, the ratchet funds infrastructure and reserve capacity. From your side of the meter, it is almost always a cost adder. A short commissioning event, a maintenance test, or one profitable production push can set a peak you pay for over and over again.
Bill volatilityOne event, twelve months of impact
A single interval becomes the floor. Budgeting gets harder because a good month in operations does not translate to a good month on the bill.Knowledge gapMetered and billed are not the same
Two lines appear on the bill. Nothing on the invoice tells you which past interval is driving the gap between them.Seasonal punishmentPeak season sets the off-season floor
A facility that runs hard one quarter can pay demand charges based on that quarter for the rest of the year.Commissioning trapNecessary tests set expensive peaks
Bringing on new equipment or running backup tests are activities you have to do. Under a ratchet, they can lock in months of higher billed demand.Demand charges as a share of the C&I billFor many C&I customers, demand charges are a large slice of the total, not a rounding error. - 03 Your side of the meter What a ratchet actually does to you
From the utility side, the ratchet funds infrastructure and reserve capacity. From your side of the meter, it is almost always a cost adder. A short commissioning event, a maintenance test, or one profitable production push can set a peak you pay for over and over again.
Bill volatilityOne event, twelve months of impact
A single interval becomes the floor. Budgeting gets harder because a good month in operations does not translate to a good month on the bill.Knowledge gapMetered and billed are not the same
Two lines appear on the bill. Nothing on the invoice tells you which past interval is driving the gap between them.Seasonal punishmentPeak season sets the off-season floor
A facility that runs hard one quarter can pay demand charges based on that quarter for the rest of the year.Commissioning trapNecessary tests set expensive peaks
Bringing on new equipment or running backup tests are activities you have to do. Under a ratchet, they can lock in months of higher billed demand.Demand charges as a share of the C&I billFor many C&I customers, demand charges are a large slice of the total, not a rounding error. What operators believe What is actually true It only applies if I exceed my historical peak. If that were true it would not be a ratchet. You can be billed at a percentage of the historical peak even when you stay well below it. Reducing kilowatt-hours will solve my demand problem. Usage and demand are different. You can cut total consumption and still create one high interval that sets a peak. Once I set a peak I am stuck with it forever. The ratchet is bounded by the look-back window. A peak drops out of a rolling twelve-month window or is replaced by a higher one. Demand charges are a small piece of the bill. For many C&I customers they are between the low and high shares in the figure above. Combined with a weak load factor they drive up your all-in cost per kilowatt-hour. My consultant will handle this. A consultant does not start the extruder, run the compressor, or schedule your backup test. Without live data and a link between finance and ops, a memo does not change plant floor behavior. The energy system gap5ftlow end of the gap10fthigh end of the gap99.9%cases where the utility does not step inA few feet of wall between meter and panel is where the largest unsolved problem in C&I energy management lives. - 04 The traps Five myths that keep operators overpaying
What operators believe What is actually true It only applies if I exceed my historical peak. If that were true it would not be a ratchet. You can be billed at a percentage of the historical peak even when you stay well below it. Reducing kilowatt-hours will solve my demand problem. Usage and demand are different. You can cut total consumption and still create one high interval that sets a peak. Once I set a peak I am stuck with it forever. The ratchet is bounded by the look-back window. A peak drops out of a rolling twelve-month window or is replaced by a higher one. Demand charges are a small piece of the bill. For many C&I customers they are between the low and high shares in the figure above. Combined with a weak load factor they drive up your all-in cost per kilowatt-hour. My consultant will handle this. A consultant does not start the extruder, run the compressor, or schedule your backup test. Without live data and a link between finance and ops, a memo does not change plant floor behavior. The energy system gap5ftlow end of the gap10fthigh end of the gap99.9%cases where the utility does not step inA few feet of wall between meter and panel is where the largest unsolved problem in C&I energy management lives.You cannot call something management unless you monitor and control it. Ratchets sit at the intersection of finance, operations, and data. Track the right numbers and the mechanism goes from black magic to a controllable line item.
- 1 Find your ratchet percentage in the tariff language. It is the percentage applied to your historical peak.
- 2 Find your look-back period in the same sentence. That defines how long a given peak follows you.
- 3 Pull both metered demand and billed demand from the most recent bill. If they differ, identify which past peak is driving the gap.
- 4 Multiply billing demand by the demand rate. That is your monthly demand cost.
- 5 Compute load factor against billed demand, not metered demand, so you see your true all-in cost per kilowatt-hour.
Non-negotiableThe king question for any vendor
From rate language to plant floor behaviorEvery link in this chain has to exist, or the ratchet stays uncontrolled. - 05 Your leverage The metrics to track and the questions to ask
You cannot call something management unless you monitor and control it. Ratchets sit at the intersection of finance, operations, and data. Track the right numbers and the mechanism goes from black magic to a controllable line item.
- 1 Find your ratchet percentage in the tariff language. It is the percentage applied to your historical peak.
- 2 Find your look-back period in the same sentence. That defines how long a given peak follows you.
- 3 Pull both metered demand and billed demand from the most recent bill. If they differ, identify which past peak is driving the gap.
- 4 Multiply billing demand by the demand rate. That is your monthly demand cost.
- 5 Compute load factor against billed demand, not metered demand, so you see your true all-in cost per kilowatt-hour.
Non-negotiableThe king question for any vendor
From rate language to plant floor behaviorEvery link in this chain has to exist, or the ratchet stays uncontrolled. When to act on your ratchet exposure now
✓ Move on this- Metered demand and billed demand on your last bill are clearly different
- Your operation is seasonal or intermittent and one quarter dominates the year
- You are being pitched a rate change or demand project in the next few months
- Demand charges are a large share of the total bill and load factor looks weak
- A recent commissioning event or one-off peak is visibly driving the floor
✗ Do not chase it yet- You have no live or interval data yet and cannot even see peaks in real time
- No one on the team owns the link between the tariff, the bill, and operations
- The vendor cannot sit down with your tariff and recreate last month's bill
- The proposed savings are quoted from regional averages, not your specific rate
- There is no willingness at finance and operations to coordinate around demand
- Decision matrix
When to act on your ratchet exposure now
✓ Move on this- Metered demand and billed demand on your last bill are clearly different
- Your operation is seasonal or intermittent and one quarter dominates the year
- You are being pitched a rate change or demand project in the next few months
- Demand charges are a large share of the total bill and load factor looks weak
- A recent commissioning event or one-off peak is visibly driving the floor
✗ Do not chase it yet- You have no live or interval data yet and cannot even see peaks in real time
- No one on the team owns the link between the tariff, the bill, and operations
- The vendor cannot sit down with your tariff and recreate last month's bill
- The proposed savings are quoted from regional averages, not your specific rate
- There is no willingness at finance and operations to coordinate around demand
Questions for your morning huddle- On our main accounts, what is our current ratchet percentage and look-back period, and can we point to the exact sentence in the tariff that defines it?
- On last month's bill, what were our metered demand and billed demand, and if they differ, what historical peak is driving that gap?
- Do we have seasonal or intermittent operations where one busy period is setting the floor for the rest of the year, and do seasonal rate alternatives exist?
- What live or near-real-time demand data do we have today, and who in the organization is looking at it in a way that can influence scheduling?
The one thing to rememberThe ratchet is not black magic. It is the higher of your current metered peak or a percentage of your worst peak in the look-back window, applied every single month until that old peak drops out.
Pull your last bill and your tariff this week. Find the ratchet percentage, the look-back period, and the specific past peak that is currently setting your billed demand floor. Bring those three answers to your next finance and operations huddle.
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. - The one thing to remember
The ratchet is not black magic. It is the higher of your current metered peak or a percentage of your worst peak in the look-back window, applied every single month until that old peak drops out.
Pull your last bill and your tariff this week. Find the ratchet percentage, the look-back period, and the specific past peak that is currently setting your billed demand floor. Bring those three answers to your next finance and operations huddle.
The Energy Decision BlueprintKnow 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.- Demand ratchet
- A billing provision that sets a minimum billed demand each month equal to a percentage of your highest peak over a defined look-back window.
- Peak demand
- The highest kilowatt level your meter records during any single interval, typically fifteen or thirty minutes, in the billing period.
- Metered demand
- The actual peak demand your meter recorded during the current billing period. The honest measurement of what you drew.
- Billed demand
- The demand value the utility actually charges you for this month. Under a ratchet, this is the greater of metered demand or the ratchet minimum.
- Look-back period
- The window over which the utility remembers your highest peak for the purpose of setting the ratchet minimum. Often twelve months, sometimes seasonal.
- Ratchet percentage
- The multiplier applied to your historical peak to establish the minimum billed demand. Common values run from around seventy percent upward.
- Load factor
- The ratio of energy used over the period to what you would have used running continuously at your peak. Higher is better; ratchets damage load factor calculated on billed demand.
- Demand budgeting
- The process of cataloging how major equipment and processes contribute to the monthly peak, then using that catalog to guide scheduling and controls.
- Energy system gap
- The physical and jurisdictional space, only a few feet wide, between the utility meter and the main distribution panel, where data, operational knowledge, and regulatory participation are all missing.