How to Lower Peak Demand Charges at an Ohio Business
The short answer
A demand charge is set by your single highest 15- or 30-minute interval in the month, so the goal is simple: stop large loads from running at the same time. Most sites get the biggest reduction from sequencing morning start-ups, staging HVAC, and scheduling EV or forklift charging. Automatic load-limiting controls come next, and batteries after that. Pay special attention to ratchets, where one bad interval can raise billing demand for months.
For what demand is and how Ohio utilities bill it, see demand charges explained; for the separate annual capacity tag, see capacity tags (PLC) explained; and for cutting load during PJM's summer peak hours to lower that tag, see the PLC operations guide.
Step 1: Find out what sets your peak
You can't manage a peak you can't see. Download 12 months of 15-minute interval data from your utility's business portal, then:
- List the top ten intervals in each month with date and time.
- Note what was running in each — start-up, a batch process, a heat wave, a shift change.
- Look for patterns: Monday mornings after a weekend setback, the first hot afternoon of summer, chargers plugged in at 3 p.m.
- Calculate load factor (kWh ÷ (peak kW × hours in the billing period)). A low figure means you're paying demand charges for capacity you use briefly.
Peaks that happen after hours or on weekends usually point to controls problems — a schedule that was overridden, a stuck economizer, equipment left in hand mode.
The tactics, from cheapest to most capital-intensive
| Tactic | How it lowers kW | Cost level | Watch out for |
|---|---|---|---|
| Sequence start-ups | Bring rooftop units, compressors and production lines on in stages | Programming or procedure only | Comfort at opening; stage over 30–60 minutes |
| HVAC staging and pre-cooling | Limit how many compressor stages run at once; pre-cool before the afternoon peak; widen setpoints slightly at peak | Building automation programming | Humidity and occupant comfort |
| Process scheduling | Move ovens, kilns, welders, washdowns and batch loads away from each other and from HVAC peaks | Operational | Labor schedules, product quality |
| EV and forklift charging management | Stagger charger start times, use power-sharing, charge overnight | Charger software or timers | Vehicles must still be ready for the shift |
| Load-limiting controller | Automatically sheds deferrable loads (water heaters, some HVAC stages, chargers) as demand nears a set limit | Controller, relays, integration | Never shed life-safety or critical process loads; revisit limits seasonally |
| Variable-frequency drives on fans and pumps | Run motors at reduced speed when full output isn't needed | Equipment | Harmonics — see power factor correction |
| Battery storage | Discharges during your peak intervals so the meter sees less | Highest capital | Must be sized for peak duration, not just kW |
A note on "soft starts": motor inrush lasts seconds, while demand is averaged over 15 or 30 minutes, so soft starters and VFDs rarely cut a demand charge on their own. The savings come from running equipment at lower speed, or not all at once.
Ratchets: avoiding the long tail
Some Ohio business schedules set billing demand at the greater of this month's peak or a percentage of a recent high peak, so a single spike can follow you for up to a year. Check your tariff for "ratchet" or "minimum billing demand," then:
- Identify the months that set the ratchet (often summer) and apply your tightest controls then.
- Schedule tests and commissioning — generator transfers back to the grid, new equipment start-up, chiller tests — for low-load periods.
- Bring new load online in shoulder months so its first peak doesn't combine with cooling load.
- Brief contractors and night crews on which loads can't run together.
Worked savings example
Illustrative only; use your own tariff's demand rate.
A plant on a demand-billed schedule pays an assumed $12 per kW-month in demand charges. Its interval data show the monthly peak — about 400 kW — is set every weekday between 7:00 and 7:30 a.m., when six rooftop units, two air compressors and the production line all start together.
- Staggered start-up. Rooftop units start at 6:15, compressors at 6:45 and production at 7:00. The new peak is about 320 kW.
- Monthly saving: 80 kW × $12 = $960.
- Annual saving: $960 × 12 = $11,520, for the cost of reprogramming start times.
Now add a ratchet. Suppose the tariff holds billing demand at no less than an assumed 80% of the highest peak in the past 11 months, and an unmanaged July afternoon hit 450 kW. That sets a floor of 360 kW. In six milder months when the plant's actual peak is 300 kW, it pays for 60 kW it didn't use: 60 × $12 × 6 = $4,320 of avoidable charges. Keeping the July peak at 375 kW would drop the floor to 300 kW and eliminate them.
Some of these reductions also help your capacity tag — but only if they happen during PJM's summer peak hours, typically hot weekday afternoons. The morning start-up fix above doesn't touch the tag; afternoon HVAC staging on peak days can. At 2026/27 prices each kW of tag costs about $120 a year.
Storage and charging: sizing and incentives
- Size batteries by energy, not just power. Holding a 100 kW reduction through a two-hour afternoon peak takes at least 200 kWh of usable storage, plus a margin for battery aging.
- Federal storage credit. The investment tax credit for storage remains available in full for projects starting construction through 2033, then steps down to 75%, 50% and 0% in 2034, 2035 and 2036; foreign-entity-of-concern restrictions apply to projects starting after December 31, 2025. Confirm eligibility with a tax adviser.
- EV chargers. The federal 30C charger credit ended for property placed in service after June 30, 2026. Confirm with a tax adviser.
- No utility rebates. AEP Ohio, Duke, AES Ohio and the FirstEnergy utilities don't currently offer business efficiency rebates, so payback has to come from bill savings, tax credits or financing such as C-PACE in participating communities.
For storage operations in more depth, see best practices for energy storage; for being paid to curtail during grid emergencies, see demand response.
Keep the savings
- Set a monthly demand target and an alarm at 90% of it.
- Review each bill's peak against the target, and each month's top intervals against the cause.
- Re-check controls after any equipment change, tenant change or building automation update.
- Revisit your rate schedule if load has changed substantially — a different schedule may fit better.
FAQ
What is the fastest way to lower a demand charge?
Stagger start-ups so large motors, compressors and HVAC units don't come on together. It usually costs nothing beyond reprogramming and shows up on the next bill.
Will a battery pay back at my site?
It depends on your demand rate, how long your peaks last, installed cost and tax credits. With no business rebates from Ohio's investor-owned utilities, run the numbers on your own interval data.
Does lowering my monthly peak lower my capacity tag?
Only if the reduction happens during PJM's summer peak hours. Monthly demand and the capacity tag are measured at different times.
How do demand ratchets work?
Billing demand is set at the higher of your current peak or a percentage of a recent high peak, so one spike can raise charges for months. Your rate schedule states whether a ratchet applies.