Markets · Analysis
I.The quiet asset on your meter
If you run a cold-storage warehouse in the lower Northeast, a hospital in University City, or a plant along the Delaware that can move a shift to overnight, you hold something most ratepayers do not: the ability to go quiet on command. On the hottest afternoons in July and the coldest mornings in January, the regional grid runs tight, and the people who operate it will pay a business to cut its load for a few hours.
Your PECO bill is only one side of this. The other side is the wholesale market run by PJM Interconnection, the regional grid operator based in Valley Forge that balances supply and demand across Pennsylvania and twelve other states and the District of Columbia. PJM would rather pay a willing customer to drop load for a few hours than risk running short, because the alternative on a strained day can be rolling outages.
That arrangement has a name: demand response (the practice of paying electricity users to reduce or shift consumption when the grid is stressed, instead of paying a power plant to produce more). It is a revenue line, not a rebate, and it is worth understanding before a sales call from a curtailment company frames it for you.
II.How the switch-off actually works
Most businesses do not sign up with PJM directly. They sign with a curtailment service provider (a company, often called a CSP, that enrolls customers, bids their combined load reduction into PJM's markets, and splits the proceeds). The CSP handles the metering, the paperwork, and the dispatch instruction when a cut is called. Your job is to actually reduce load when the call comes, by dimming a process, pre-cooling a freezer, or starting your own backup generator so you pull less from the grid.
The headline program here is PJM's Emergency Load Response Program, the piece that pays customers to curtail during declared grid emergencies. A cold-storage operator might lower its setpoints for a few hours and ride on thermal mass; a hospital might shift to on-site generation it already tests monthly. The number of events in a year is usually small, often only a handful or fewer, and in some mild years none at all, but you commit to being available across a defined season.
III.The honest math
The pay comes mostly as a capacity payment, money for the promise to be available, set through PJM's capacity auction (the yearly process where PJM pays resources to commit to being on call years ahead). That clearing price moves a lot from one auction to the next, so any dollar figure a CSP quotes is an estimate, not a guarantee. Treat a bare per-megawatt number with the same skepticism you would treat a too-precise savings claim, and ask what auction year it is based on.
The other half of the math is the penalty. If a cut is called and you fail to deliver the load reduction you promised, you can owe money back, which eats into or wipes out the season's payment. The deals that work tend to be ones where the business can genuinely give up the load without hurting operations, a shift it can move, a process it can pause, a generator it already maintains. If staying curtailed for the full window would cost you more than the payment, the arithmetic does not favor you, and an honest CSP will say so.
IV.Who signs you up, and who is watching
Three bodies sit behind this. PJM designs and runs the programs and the capacity auction. The Federal Energy Regulatory Commission, the federal agency that oversees wholesale power markets, sets the rules that let demand response compete and get paid in those markets. The Pennsylvania Public Utility Commission regulates PECO itself, including the separate efficiency work described below.
Keep demand response separate in your head from the PECO rebates funded under Act 129, the Pennsylvania law that directs utilities to run energy-efficiency and conservation programs. Act 129 pays you to use less all the time, through better equipment and rebates. Demand response pays you to drop load on specific stressed hours. A business can often do both, but they are different programs, different money, and different paperwork, and conflating them is the most common mistake this desk sees.
V.Worth watching this month
1. Watch PJM's posted capacity auction results and schedule, since the clearing price there is what ultimately sets how much any demand response commitment is worth, and it has swung sharply in recent auctions.
2. If a curtailment service provider approaches you, ask which specific program and which delivery year the quote is based on, because a number tied to an old auction can be far off from what you would actually see.
3. Check PJM's seasonal demand response enrollment windows before committing, as the dates to sign up for a given summer or winter period close well ahead of the season itself.
4. Watch for any FERC proceeding touching demand response market rules, since a rule change can quietly alter who qualifies and how curtailment gets paid.
5. Review your own load before signing anything, and identify the one shift, process, or generator you could truly give up for a few hours, because that honest inventory, not the pitch, decides whether this pays.
Frequently asked questions
- Is this the same as the PECO rebates I have heard about?
- No. The PECO efficiency rebates come from Pennsylvania's Act 129 and pay you to use less electricity all the time. Demand response pays you to cut load on a handful of stressed hours and is run through PJM's wholesale markets.
- How many times a year would I actually be called to cut?
- Usually a small number, often only a few events a season, and in mild years sometimes none. You are paid mainly for being available, not for the number of calls.
- Do I have to shut down completely?
- No. Most participants reduce rather than stop, by shifting a process, pre-cooling, or running on-site backup generation so they draw less from the grid. The reduction you promise is the reduction you must deliver.
- What happens if I cannot cut when a call comes?
- You can owe a penalty that reduces or erases the season's payment. That is why the programs work best for load you can genuinely give up without hurting operations.
Sources on the bench
PJM Interconnection, Demand Response (regional grid operator) The grid operator's overview of its demand response programs, including how load reductions are bid into and paid by its markets. · www.pjm.com/markets-and-operations/demand-response
PJM Interconnection, Emergency Load Response and Operating Reserve (grid operator manual) PJM's manuals library, where the detailed rules for the Emergency Load Response Program and curtailment obligations are published. · www.pjm.com/library/manuals
Federal Energy Regulatory Commission, Demand Response (.gov) The federal regulator's explanation of how demand response participates in wholesale power markets and the rules that govern it. · www.ferc.gov/power-sales-and-markets/demand-response
Pennsylvania Public Utility Commission, Act 129 (.gov) The state regulator's page on Pennsylvania's energy-efficiency law, useful for telling Act 129 rebates apart from PJM demand response. · www.puc.pa.gov/filing-resources/issues-laws-regulations/act-129
PECO, Ways to Save (regional utility) PECO's customer programs for efficiency and conservation, the utility-side offerings that sit alongside, but separate from, PJM market payments. · www.peco.com/WaysToSave