Contracted Load vs. Actual Load
Your Interconnection Service Agreement is a financial floor, not a capacity ceiling. Here is how to read it, where the overbuild risk sits, and how to decide whether to reduce or hold before the window closes.
Who this is for
- ■Plant managers and facility managers with a formal Interconnection Service Agreement
- ■CFOs and operations executives at manufacturers, cold storage, food processing, campus and healthcare systems
- ■EV fleet operators watching actual load fall short of contracted capacity
- ■Any C&I operator whose electric bill runs five figures or more each month
Reduce contracted interconnection capacity now to avoid take-or-pay penalties, or hold it as a buffer against future load growth?
Contracted load is not a technical ceiling on how much power you can draw. It is a binding financial floor. Under the large-load tariff structures now appearing across the country, your monthly bill is fixed at a percentage of contracted load, commonly 80%, regardless of what you actually use.
31%of this guide, read. The rest of it is below.
- 02 The mechanism How minimum bills, terms, and collateral compound the exposure
A take-or-pay minimum bill fixes your monthly billing at a set percentage of contracted capacity, not actual usage. These are not penalties for deviation. This is the baseline cost structure.
Minimum-bill percentages across real tariffsThe floor varies by utility, but every one of these is well above typical actual-to-contracted ratios during ramp. Indiana Michigan Power sets its minimum as the greater of 80% of contracted capacity or 80% of your highest monthly demand over the prior 11 months. A single tail-event month can set the floor for the following year.
DurationTerm multiplies the exposure
Traditional C&I agreements run 1 years to 3 years. The emerging large-load archetype runs 10 years or longer. PPL's Schedule LP-6 carries 10 years. Xcel requires 15 years. Florida Power and Light and Kentucky Power both require 20 years. Whatever floor you sign to, you are paying it for that duration.
Utility Minimum term PPL Schedule LP-6 10 years Xcel Energy 15 years Florida Power and Light 20 years Kentucky Power 20 years The most common ramp-up period in large-load tariffs is up to 5 years. This is the window where the gap between contracted and actual load is largest by design, and where minimum-bill obligations start accumulating against capacity you are not using.
PPLGreater-of clause
Payment is based on the greater of actual peak demand or 80% of the contracted ramp schedule, until system upgrade costs are satisfied.Tri-StateTight tolerance band
Initial load projections must stay within 5% tolerance for each of the next 3 years, with financial responsibility triggered by significant deviation.How the ramp becomes a billEvery step compounds the floor before your actual load has a chance to catch up. For an EV fleet or a cold storage operator, a single extreme month, extreme cold, expanded fleet deployment, a heat event, can set the floor that follows you through the next year. Model the tail, not the average.
- 03 What it does to you The ramp-up window is where overbuild risk concentrates
The most common ramp-up period in large-load tariffs is up to 5 years. This is the window where the gap between contracted and actual load is largest by design, and where minimum-bill obligations start accumulating against capacity you are not using.
PPLGreater-of clause
Payment is based on the greater of actual peak demand or 80% of the contracted ramp schedule, until system upgrade costs are satisfied.Tri-StateTight tolerance band
Initial load projections must stay within 5% tolerance for each of the next 3 years, with financial responsibility triggered by significant deviation.How the ramp becomes a billEvery step compounds the floor before your actual load has a chance to catch up. For an EV fleet or a cold storage operator, a single extreme month, extreme cold, expanded fleet deployment, a heat event, can set the floor that follows you through the next year. Model the tail, not the average.
A change band is a contractual allowance, typically around 20% of contracted demand, that lets you reduce capacity with notice but without triggering exit fees. Reductions within the band cost you notice. Reductions beyond it trigger fee structures that can wipe out whatever you would have saved.
What operators assume What the ISA actually does "We can right-size any time." Only within the change band, roughly twenty percent, with notice. "Exit fees are a last-resort penalty." PPL links exit fees directly to minimum-load and security obligations. They recover the same floor you were trying to escape. "If we exit, we forfeit future bills." You trigger a lump-sum sized to unrecovered fixed costs, and collateral is already posted against it. "Collateral is a formality." Michigan required collateral equal to half the exit fee, specifically to ensure the customer can and will pay. Where the reduction landsInside the band, notice is the cost. Outside, exit fees apply. - 04 The trap The change band is the number that separates a fix from a fee
A change band is a contractual allowance, typically around 20% of contracted demand, that lets you reduce capacity with notice but without triggering exit fees. Reductions within the band cost you notice. Reductions beyond it trigger fee structures that can wipe out whatever you would have saved.
What operators assume What the ISA actually does "We can right-size any time." Only within the change band, roughly twenty percent, with notice. "Exit fees are a last-resort penalty." PPL links exit fees directly to minimum-load and security obligations. They recover the same floor you were trying to escape. "If we exit, we forfeit future bills." You trigger a lump-sum sized to unrecovered fixed costs, and collateral is already posted against it. "Collateral is a formality." Michigan required collateral equal to half the exit fee, specifically to ensure the customer can and will pay. Where the reduction landsInside the band, notice is the cost. Outside, exit fees apply. Do not treat this as binary. Three structural alternatives exist in current tariff design, and each fits a different operational profile.
Option AInterruptible service
Reduced minimum-bill obligations in exchange for defined curtailment. Idaho Power allows up to 225 hours of remote disconnection during summer peaks. Entergy Arkansas ranges from 10 events/year to 20 events/year. Only viable if the process can tolerate interruption.Option BBring-your-own generation
Some jurisdictions allow customers to offset contracted capacity with committed onsite resources. Pennsylvania's Model Tariff notes lower minimum-demand and standby charges for customers not using their full interconnection limits.Option CPhased renegotiation
Reduce inside your existing change-band allowance. The most accessible option when the actual-to-contracted gap stays inside the 20% window.On the other side of the ledger, RTO interconnection queues run 3 years to 5 years. PJM expects 40 GW of generation to retire between 2022 and 2030 while load is growing. Capacity surrendered today may be impossible to re-acquire at equivalent cost or timeline.
- 1 Pull the ISA. Locate the minimum-bill percentage.
- 2 Find the change-band percentage and the notice requirement.
- 3 Measure your actual-to-contracted gap over the last twelve months.
- 4 Decide whether the shortfall is temporary and phase-lagged, or structural and permanent.
- 5 If structural and within the band: file the notice. If temporary: hold, and revisit quarterly.
- 05 Your leverage Reduce, hold, or restructure, and what to ask
Do not treat this as binary. Three structural alternatives exist in current tariff design, and each fits a different operational profile.
Option AInterruptible service
Reduced minimum-bill obligations in exchange for defined curtailment. Idaho Power allows up to 225 hours of remote disconnection during summer peaks. Entergy Arkansas ranges from 10 events/year to 20 events/year. Only viable if the process can tolerate interruption.Option BBring-your-own generation
Some jurisdictions allow customers to offset contracted capacity with committed onsite resources. Pennsylvania's Model Tariff notes lower minimum-demand and standby charges for customers not using their full interconnection limits.Option CPhased renegotiation
Reduce inside your existing change-band allowance. The most accessible option when the actual-to-contracted gap stays inside the 20% window.On the other side of the ledger, RTO interconnection queues run 3 years to 5 years. PJM expects 40 GW of generation to retire between 2022 and 2030 while load is growing. Capacity surrendered today may be impossible to re-acquire at equivalent cost or timeline.
- 1 Pull the ISA. Locate the minimum-bill percentage.
- 2 Find the change-band percentage and the notice requirement.
- 3 Measure your actual-to-contracted gap over the last twelve months.
- 4 Decide whether the shortfall is temporary and phase-lagged, or structural and permanent.
- 5 If structural and within the band: file the notice. If temporary: hold, and revisit quarterly.
Reduce now, or hold as a buffer?
✓ Reduce within the change band- The actual-to-contracted gap is persistent and documentable over the last twelve months.
- The gap sits inside the change band, so notice is the only cost.
- The load shortfall is structural, not phase-lagged behind a known ramp.
- You are in the ramp-up window and every month of delay compounds the minimum-bill floor.
- You have no near-term electrification or expansion plan that will need the surrendered megawatts.
✗ Hold the capacity- Load growth is genuine but phase-lagged, tied to a specific electrification or capacity roadmap.
- A single peak month could re-set your minimum bill against the prior-eleven-month lookback.
- The gap already exceeds the change band, so reducing triggers exit fees that may exceed the savings.
- Your RTO queue timeline makes re-acquisition of equivalent capacity multi-year and uncertain.
- Your process cannot tolerate interruption, closing off the interruptible middle path.
- Decision matrix
Reduce now, or hold as a buffer?
✓ Reduce within the change band- The actual-to-contracted gap is persistent and documentable over the last twelve months.
- The gap sits inside the change band, so notice is the only cost.
- The load shortfall is structural, not phase-lagged behind a known ramp.
- You are in the ramp-up window and every month of delay compounds the minimum-bill floor.
- You have no near-term electrification or expansion plan that will need the surrendered megawatts.
✗ Hold the capacity- Load growth is genuine but phase-lagged, tied to a specific electrification or capacity roadmap.
- A single peak month could re-set your minimum bill against the prior-eleven-month lookback.
- The gap already exceeds the change band, so reducing triggers exit fees that may exceed the savings.
- Your RTO queue timeline makes re-acquisition of equivalent capacity multi-year and uncertain.
- Your process cannot tolerate interruption, closing off the interruptible middle path.
Questions for your morning huddle- What is our minimum-bill percentage, and what is our actual-to-contracted ratio over the last twelve months?
- What is our change-band allowance, and does our current gap sit inside it or outside it?
- Is our load shortfall temporary and phase-lagged, or structural and permanent?
- If we surrender capacity now, what is the realistic timeline and cost to re-acquire it under our RTO queue?
The one thing to rememberYour contracted capacity is a financial commitment, not a reservation. If your actual load runs persistently below your minimum-bill threshold, you are paying for capacity that delivers nothing, and the options to fix that are narrower than they were two years ago.
This week, pull your ISA and write down three numbers: the minimum-bill percentage, the change-band percentage, and your actual-to-contracted ratio over the last twelve months. Bring those three numbers to the next huddle before anyone debates reduce or hold.
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. This week, pull your ISA and write down three numbers: the minimum-bill percentage, the change-band percentage, and your actual-to-contracted ratio over the last twelve months. Bring those three numbers to the next huddle before anyone debates reduce or hold.
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.- Interconnection Service Agreement
- The contract between a large customer and the utility that sets contracted capacity, ramp, minimum-bill terms, collateral, change bands and exit provisions.
- Contracted load
- The capacity the customer commits to in the ISA. It functions as a financial floor, not just a technical ceiling on draw.
- Take-or-pay minimum bill
- A provision fixing monthly billing at a set percentage of contracted capacity regardless of actual usage. Common range across DELTa filings is seventy to one hundred percent.
- Change band
- The contractual allowance, typically about twenty percent of contracted demand, that lets a customer reduce capacity with notice but without triggering exit fees.
- Exit fee
- A lump-sum obligation charged when a customer terminates or reduces beyond the change band, sized to recover the utility's unrecovered fixed costs and minimum-bill obligations.
- Ramp-up schedule
- The phased demand curve the customer commits to in the ISA. Utilities bill against the greater of actual demand or the scheduled ramp during the ramp window, most commonly up to five years.
- Prior-month peak ratchet
- A construct that sets the minimum bill as the greater of a percentage of contracted capacity or a percentage of the customer's highest monthly demand over a lookback window, often eleven months.
- Bring-your-own generation
- A tariff framework letting the customer fund or contract dedicated onsite or system resources to offset contracted utility capacity, sometimes in exchange for reduced minimums or faster interconnection.
- DELTa database
- The CoBank-tracked database of emerging large-load tariff filings, the source for the seventy-seven-filing snapshot used across this guide.