PJM Says We're Good for Summer — But Your Panel Might Not Be

# PJM Says We're Good for Summer — But Your Panel Might Not Be

The Pennsylvania Public Utility Commission just dropped its 2026 summer readiness report, and the headline number is comforting: PJM's sitting on 180,200 MW of installed capacity across the footprint. Grid's fine. Your main panel? That's a different story.

I've run more service calls in July than any other month, and it's always the same scene. Window units stacked on a 15-amp bedroom circuit. Central air pulling max load while someone fires up a table saw in the garage. Breaker won't reset, homeowner's pissed, and I'm explaining that no, you can't just "bump it up to a 30."

Summer eats amps. Here's what actually matters when it's 94° out and everything with a compressor is screaming.

Load Calculations That Live in the Real World

The 2026 NEC updated how we calculate load for existing services, and it's about time. The old method treated every outlet like someone might plug in a space heater, which led to absurdly conservative numbers that nobody trusted. Now we've got recognized demand factors for controlled loads — stuff on timers, smart thermostats, EV chargers with scheduled charging.

Makes the math cleaner. Doesn't change the physics.

Your central AC is still the 800-pound gorilla. A 3-ton unit pulls around 15 amps at 240V when it's running flat out, which it will be all afternoon in August. Add a fridge, a couple of ceiling fans, normal house loads, maybe a dehumidifier in the basement, and you're using 60-70% of a typical 100-amp service before you do anything interesting.

That's fine until it isn't.

Run a quick load calc if you're planning anything new this summer. I use the new NEC method because it's actually realistic, but I also walk the house. What's plugged in? What runs at the same time? A proper load calc isn't just filling out a form — it's knowing that the pool pump and the dryer never overlap because one's on a timer and the other runs evenings.

AC Circuit Load: What Actually Trips You Up

Central air should be on a dedicated circuit. Period. If your compressor shares a breaker with anything else, that was a shortcut someone took and you're going to pay for it when the contactor finally sticks.

Window units are where it gets messy. A big 12,000 BTU window banger can pull 10-11 amps on startup, settle around 8-9 running. You put two of those on a 15-amp bedroom circuit and you're done. Can't run both at once. People do it anyway, then wonder why the breaker pops every time the compressor cycles.

I've seen guys run 12-gauge to a single dedicated 20-amp circuit for a window unit, and honestly, if you're cooling a bonus room that gets hammered by afternoon sun, it's worth it. Costs maybe $120 in wire and a breaker. Beats replacing nuisance-tripped breakers or, worse, someone jamming a quarter behind one because "it keeps popping."

Don't do that. I've pulled panels with pennies, with aluminum foil, with straight pieces of 12-gauge wedged in. It always ends bad.

If you're adding cooling capacity this summer, check the panel first. Look at what breakers are doubled up, check for any that are warm to the touch, see if you've even got space for another two-pole if you need it. A lot of older 100-amp panels are completely full, and that's your clue that any serious load addition means a service upgrade.

Preventing Electrical Overloads: Stop Stacking Loads

The warning signs are obvious if you're paying attention. Lights dim when the AC kicks on. Breakers trip on hot afternoons but never in April. Outlets feel warm. Extension cords everywhere because there's never a plug where you need one.

Here's what people get wrong: they think the breaker is the problem. Breaker's doing its job. The problem is you're asking a 15-amp circuit to carry 18 amps because it's hot and everything's running.

Summer overloads come from cumulative load, not one big thing. It's the AC, plus the ceiling fans, plus someone charging tools in the garage, plus the microwave at lunch. Each thing alone is fine. All at once, you're popping breakers.

Walk your house and map what's on what. Kill the main, pull outlets, see what's daisy-chained. I've found bedrooms and half a kitchen on one circuit. I've found panels with no labeling and three breakers marked "misc." You can't manage load if you don't know what's where.

If you're tripping the same breaker weekly, that circuit's overloaded. You've got three options: pull some loads off onto a different circuit, add a new circuit, or stop running everything at once. Only one of those is free.

Generator Readiness: Test It Before the Lights Go Out

PJM's got capacity. Your local distribution still goes down in storms.

If you've got a generator — portable or standby — summer's when you test it under real load, not no-load in the driveway. Run it for an hour with the AC on, fridge running, some lights. See if it bogs. Check voltage with a real meter, not the lying gauge on the generator. I've seen supposedly 7500W generators that can't hold 235V with 4000W on them. Voltage sag kills compressors.

Interlock or transfer switch, not a suicide cord. I know everyone's got a story about their uncle who backfed the panel for 20 years and never had a problem, right up until the problem. Don't be the problem.

Standby generators need exercised weekly if they've got that feature. If yours doesn't auto-exercise, run it monthly. Carburetors gum up, fuel goes stale, and the worst time to find out your generator won't start is when the freezer's thawing.

Check the oil. I've seen generators that ran dry because nobody checked, locked up mid-outage. Expensive lesson.

Ceiling Fan Wiring: The Seasonal Swap Everyone Messes Up

This is the time of year I get calls about ceiling fans not working, and it's almost always the same issue: someone swapped a light fixture for a fan without checking if the box is rated for it.

Ceiling fans need a box rated for 70 lbs dynamic load minimum. Your standard round pancake box is good for 50 lbs static — a light fixture. It'll hold a fan until it doesn't, and then you've got a spinning blade assembly on the floor and a hole in your ceiling.

If you're installing a fan, use a proper fan-rated box or a fan brace. They're like $15. Not negotiable.

Wiring's straightforward if there's already a switch loop. Black to black, white to white, ground to ground, hang it per the instructions. If you want separate control for the light and fan, you need a three-wire (14-3 or 12-3) run from the switch. A lot of older houses don't have that, which is why you see so many pull-chain fans.

The trick nobody mentions: if you're replacing an old fan, the new one's bracket probably won't line up with the old box holes. Bring a self-tapping screw assortment or you'll make two trips.

Also, those fans with the LED arrays built in? When the LED dies, you're replacing the whole fan. Can't swap a bulb. Just know that going in.

What the 2026 Code Changes Actually Mean for You

NEC 2026 tightened up a bunch of stuff around EV charging and load calculations, but the big one for residential summer work is how we treat existing service calculations. You can now use actual demand factors for loads you know are controlled — smart thermostats, scheduled EV chargers, that kind of thing.

Practically, it means I can sometimes justify an upgrade to 200A instead of 320A when someone wants to add a subpanel for a shop. Saves the homeowner a few grand and makes the math honest.

There's also new language around receptacle ratings for EV equipment over 30A, but unless you're installing a hardwired 50A Level 2, it's not your problem this summer.

The code's playing catchup with how people actually use power now. About time.

When You Need More Than a Bigger Breaker

If you're consistently running near your panel's capacity, a bigger breaker won't fix it. You need more service.

100-amp services were fine in 1985. They're marginal now, especially if you've added central air, a home office, and a bunch of chargers. I'd say 150A is the realistic minimum for a modern house with AC, and 200A is comfortable.

Service upgrades aren't cheap — figure $2,500 to $4,500 depending on how much of the feed the utility owns and whether you need a new mast. But it's the right fix if you're using 85-90 amps on a hot afternoon. You've got no overhead, and the next thing you add will be the thing that trips you over.

Check your main breaker on a hot afternoon with everything running. If it's warm to the touch, you're close. If you can smell it, you're past close.

The Bottom Line

PJM's fine. Your house might not be.

Summer's hard on electrical systems because everything runs at once and nothing gets a break. Walk your panel, know your loads, don't assume a circuit can handle one more thing just because the breaker's rated for it.

If you're tripping breakers, fix the problem — don't just reset and hope. If you're adding load, do the math first. And test your generator now, not when the storm's already here.

It's hot. Everything's running. Make sure your system can take it.

Related from HireA.Tech

• [The 2026 NEC Generator Changes You Actually Need to Know About](/blog/the-2026-nec-generator-changes-you-actually-need-to-know-about/)
• [NEC 2026 Load Calculations: What Changed and Why It Matters](/blog/nec-2026-load-calculations-what-changed-and-why-it-matters/)