A facilities lead stands beside a newly arrived industrial machine while a finance colleague compares it with an older floor plan showing three smaller machines.
Energy Updates

Adding Equipment? One Demand Peak Can Raise Bills for Up to a Year

ENERGY INSIGHT

Adding Equipment? One Demand Peak Can Raise Bills for Up to a Year

By Arvin Chaudhary

A facilities lead stands beside a newly arrived industrial machine while a finance colleague compares it with an older floor plan showing three smaller machines.

Depending on your utility tariff, your business electricity bill may reflect both how much energy you use and your highest average power demand over a measurement interval, often 15 minutes. Some rates use a "look-back," or demand ratchet, where one high measured demand peak can affect demand charges for up to a year. This is not necessarily an instantaneous power spike; the measurement interval and look-back period depend on your tariff. The U.S. Department of Energy puts it plainly: "occasional high spikes in electricity consumption can set the demand charge for the rest of the year." So before new equipment, a new shift or fleet charging goes live, check how your rate treats peaks and plan the startup around it.

Below: the difference between usage and demand, four questions to put to your utility rate, what to check in your supply contract, and how to keep this manageable across many sites.

Usage and demand are billed differently

Kilowatt-hours (kWh) measure how much electricity you use over time. Kilowatts (kW) measure power. For billing, demand is generally measured as average power over a specified interval, often 15 minutes, rather than an instantaneous spike. DOE’s Federal Energy Management Program (FEMP) says electricity costs are set by a site’s "load magnitude and shape and its utility bill structure." Demand charges are typically based on the highest demand in a billing period, usually a month.

That changes how operating decisions show up on the bill:

  • An extra shift adds kWh, but may not raise your peak.
  • A new machine that runs at the same time as existing equipment can raise the peak even if total use barely moves.
  • Fleet chargers running together can create a new peak. DOE’s Alternative Fuels Data Center describes demand charges as a fee on your greatest power draw during peak periods, and notes that charging several vehicles at high rates at once can raise costs.

Four questions for your utility rate

FEMP notes that rate structures are "becoming increasingly complex in many places," and that "a site may anticipate load increases or decreases, which could impact the rates for which it qualifies." Your utility decides which rate applies and whether your service can carry the new load. Ask them, or a qualified rate specialist:

  1. Which rate class will the site fall into after the change?
  2. Is the demand charge based on the peak at any hour, or only during set peak hours?
  3. Does the rate have a demand look-back (also called a ratchet) that carries a high peak into later months?
  4. Does the site’s electrical service have room for the new load, or are upgrades needed?

The answer to question 2 matters for scheduling. Moving work to night hours can lower energy charges on a time-of-use rate. It won’t lower a demand charge based on your highest peak at any hour if that peak stays the same.

Plan the startup, then check the contract

If your rate penalizes peaks, the startup itself is worth planning. FEMP says "staggering equipment start-up times" can reduce peak demand and help avoid demand charges. For fleets, DOE advises working with the local utility early to confirm charging requirements and whether electrical upgrades are needed, and mapping out the fleet’s electricity use and charging times.

Then give procurement the new usage forecast and have them compare it with the signed supply contract. Check what the contract says about expected volumes and any notice you owe the supplier when usage changes. A fixed price does not by itself answer those questions.

Keep it manageable across many sites

With dozens or hundreds of locations, you don’t need a review for every small change. Flag the ones big enough to move a site’s peak: major equipment, added shifts that overlap existing operations, and new charging. For each flagged site, facilities supplies the start date, expected load and what will run at the same time; procurement checks the contract; finance budgets usage and demand charges separately.

Our perspective

The cheapest time to manage a new peak is before it happens. Once a measured demand peak triggers a rate with a look-back, you may be paying for it for months, depending on the tariff. Make the rate check and a startup plan part of approving any change big enough to move a site’s peak, and give the supply contract the same look.

Nadicent helps with all three parts of your energy cost: buy it right, pay it right and reduce your demand.

Which change on your schedule could set your next peak?

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Sources

This article is general information, not financial, legal or tax advice. Rates and rules vary by utility and state; confirm how your rate works with your utility or a qualified advisor.

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