Why is your PSEG Long Island bill so high in 2026?

The short answer: it is the Power Supply Charge, not your usage

A PSEG Long Island bill has two big pieces. Delivery and System Charges pay for the wires, poles, and crews, and they are set by LIPA. The Power Supply Charge (PSC) is the cost of the electricity itself. PSEG Long Island does not own power plants, so it buys power and fuel on the market and passes the cost straight through to you, with no markup, and it resets the PSC every single month.

That monthly reset is why the bill can jump even when the thermostat did not move. In 2026 the PSC has been unusually volatile. It opened the year at $0.129777 per kWh in January, climbed to a peak of $0.165927 in April, fell all the way to $0.116387 in August, and then snapped back to $0.139822 in September. The September rate is also 7.4% higher than September 2025, so this is not purely a seasonal blip.

PSEG Long Island's own explanation is that the PSC is 'mostly the cost of fuels (primarily natural gas) used at Long Island power plants,' and that monthly changes come largely from the gap between projected and actual costs. In plain English: when the winter was colder than forecast and gas prices ran hotter than budgeted, the shortfall gets recovered from customers in later months. The New York Post reported in April that LIPA's power supply costs were $294 million over budget through February alone, citing record cold and the war in the Middle East.

PSEG Long Island Power Supply Charge, month by month, 2026

These are the published PSC rates for the standard residential schedules, per kWh, as posted on PSEG Long Island's rate information page. The percentage column is the change from the prior month. Keep this table handy when you compare two bills, because it is usually the whole story.

• The January-to-September 2026 average PSC is about $0.1456 per kWh. A home that used 800 kWh a month paid roughly $116 a month for supply alone on average this year, before a single delivery charge.
• The March and April 2026 rates were about 32% above December 2025. If your winter bills felt like a different utility, that is why.
• The September 2026 rate is made up of a Local Supply Rate of $0.007583 and a Market Supply Rate of $0.132239. The market piece is what moves.

Did PSEG Long Island have a rate increase in 2026?

Technically, when PSEG Long Island talks about 'rates,' it means only the delivery charges, and those did not change materially for 2026. The 2026 Common Residential Electric Rates guide lists the same daily service charge of $0.56 and the same per-kWh delivery prices for Rate 194 that customers saw before. So if you call and ask whether rates went up, you may be told no, and that answer is narrowly correct.

What actually went up is the supply side, which is a pass-through and is not called a rate increase even when it adds far more to your bill than any approved rate case would. For perspective, Con Edison's regulators approved a 3.9% electric increase for 2026 in New York City and Westchester, and it made headlines. Long Island's supply charge moved by more than that, up or down, in six separate months this year.

There is one more quiet change that many homeowners still have not noticed. Since January 1, 2024, the standard residential rate on Long Island is Rate 194, a Time-of-Day rate. If you never actively chose the flat Rate 180, you are on Time-of-Day, and it changes what each kWh costs depending on the clock.

The Time-of-Day rate changes what a kilowatt-hour costs by the hour

On Rate 194, peak hours are 3 PM to 7 PM on weekdays, excluding federal holidays. Everything else, including all weekend hours, is off-peak. During peak, both the delivery charge and the Power Supply Charge are higher. During off-peak, both are lower than the flat rate. PSEG Long Island's guide says off-peak pricing offers a discount from Rate 180 for 88% of the year's hours.

The multipliers are large. In summer months (June through September), the peak Power Supply Charge on Rate 194 is 195.05% of the published rate, and the off-peak charge is 83% of it. In non-summer months the peak multiplier rises to 213.40%. Here is what that means in actual cents for September 2026, using PSEG Long Island's published numbers for the PSC and the 2026 rate guide for delivery.

• A peak kWh in September 2026 costs about 2.2 times an off-peak kWh. Running a 3.5 kW central air system for the full four-hour peak window on a weekday costs about $6.90; the same four hours after 7 PM cost about $3.15.
• From October through May the peak Power Supply multiplier climbs to 213.40%, so the peak-versus-off-peak gap widens in winter, exactly when heat pumps and electric heat run hardest.
• Daily service charge is $0.56 per day on every residential rate, or about $16.80 a month, and it does not change with usage.

The table is the rule. The simulator below is the rule playing out over one day: press play and watch the price flip at 3 PM, the panels fade before 7 PM, and what a battery does about the gap. Drag the slider to any hour, turn solar and the battery on or off, and switch to January.

A worked example: an 800 kWh Long Island home in September 2026

PSEG Long Island does not publish a single 'average bill' number on its rate pages, so instead of quoting a made-up average we will build a bill from the published prices. Take a typical Nassau or Suffolk single-family home using 800 kWh in a 30-day September billing period, on Rate 194, with 15% of its use falling in the 3 to 7 PM weekday window. That 15% share is roughly what a household with normal evening habits lands at.

• The August-to-September PSC change alone added about $18 to this bill with zero change in behavior. In March 2026, with the higher supply rate but winter delivery prices and the 213.40% peak multiplier, the same home would have paid about $239.
• Move the peak share from 15% to 30%, the pattern of a home that cooks, does laundry, and charges an EV right after work, and the September bill rises to about $262.
• Push usage to 1,400 kWh, which is common with a pool pump plus central air, and the September bill on the same 15% peak share is about $390 before taxes and the miscellaneous adjustments PSEG adds. That is how people end up staring at a $400-plus bill.

Why your PSEG Long Island bill is over $400

When a Long Island homeowner sends us a bill north of $400, it is almost always some combination of the following. Check them in order.

• High usage, not high rates. Central air in a 2,500 square foot colonial, a pool pump running 8 to 12 hours a day, a second refrigerator in the garage, and an electric dryer will push a home to 1,200 to 1,800 kWh in July, August, and September. Look at the kWh on the bill before you look at anything else.
• A high peak share on Rate 194. Homes where everyone gets back between 4 and 6 PM and immediately turns on the AC, the oven, and the dryer are paying the 49-cent all-in peak price for a big slice of their day.
• Electric heat or a heat pump in winter. Winter bills on electric heat will be affected by the 213.40% non-summer peak multiplier as well as the much larger kWh counts. Rate 580 (home heating) exists for homes heated entirely by electricity and has a lower winter delivery tier above 400 kWh.
• Estimated reads. If your bill says estimated rather than actual, the number may catch up or correct on the next actual read. Check the meter reading line on the bill.
• Deferred balances or a payment plan. A prior unpaid balance or a deferred payment agreement will inflate the amount due without inflating current charges.
• Simply the month. A September 2026 bill carries a 20% higher supply price than the August bill it follows. Two bills a month apart can look like two different homes.

What actually lowers a PSEG Long Island bill

None of these are secrets, but the order matters. Start with the free ones.

• Shift load out of 3 to 7 PM on weekdays. Dishwasher after 7, laundry on weekends, pool pump overnight, EV charging overnight. On Rate 194 every kWh you move out of the window saves roughly 27 cents in September.
• Confirm your rate code. It is printed on the bill. If your household genuinely cannot avoid the peak window, Rate 180 (flat) is still available on request. If you charge an EV, Rate 195 has a super off-peak period from 10 PM to 6 AM at a 60% Power Supply multiplier.
• Use PSEG Long Island's own Time-of-Day rate calculator, which runs your actual interval data against each rate. It is the only honest way to answer which schedule is cheaper for your house.
• Fix the biggest loads. A variable-speed pool pump, a smart thermostat with a pre-cool setting that cools the house before 3 PM and coasts through peak, and sealing an attic are the three changes we see move a Long Island bill the most for the least money.
• Apply for the Household Assistance Program if eligible. Discounted D-rates carry a lower delivery price and are available to customers on qualifying assistance programs.
• Generate your own daytime power. Solar with PSEG Long Island net metering offsets kWh on both the delivery and supply side, which is what makes it the largest single lever for homes that use a lot of electricity. The next section covers where that claim holds and where it does not.

What solar fixes on this bill, and what it does not

This is the section where a solar company's interest shows, so we are going to be precise. Under PSEG Long Island net metering, the electricity your panels produce first offsets what your home is using at that moment. Anything extra is exported to the grid and comes back to you as a kWh credit. Because the credit works at the kWh level, a well-sized system reduces both the delivery and the Power Supply lines on the bill, and it does so at whatever price the PSC happens to be that month. In a 20% PSC spike month, the credit is worth 20% more.

What solar does not do: it does not remove the daily service charge, so even a home that zeroes out its kWh still pays about $16.80 a month plus taxes. It does not directly cover the 3 to 7 PM peak window in the way people assume, because on a September weekday panel output is already tapering by 5 PM and is near zero at 7 PM. Net-metering credits soften that, but if your household is peak-heavy, a battery that charges from the panels at midday and discharges from 3 to 7 PM is what actually attacks the 49-cent kilowatt-hours.

It also does not fix a bill that is high because of a roof problem or a house that leaks air. We are a GAF Master Elite roofing contractor as well as a NABCEP-certified solar installer, and a meaningful share of the Long Island roofs we inspect need work before panels should go on. A proposal that skips the roof conversation is not a serious proposal.

Finally, the timing. The federal residential clean energy credit, the NYSERDA NY-Sun incentive, and New York's RPTL 487 property tax exemption change the math substantially, and all three have deadlines or step-downs. Our 2026 incentive stacking guide walks through them in the order they apply.

What to expect from PSEG Long Island bills this winter

The 2026 pattern was clear: the Power Supply Charge rose from January through April, eased through the summer, and reversed sharply in September. Nobody can tell you the January 2027 number, and PSEG Long Island does not publish forward rates, but three things are already known. The non-summer Rate 194 peak multiplier of 213.40% takes effect in October. Natural gas is still the fuel that sets Long Island's market supply price. And the shortfall from an over-budget winter is recovered from customers in the months that follow, which is part of why the spring 2026 rates stayed elevated for so long.

If you are going to make a change before winter, the order that pays fastest is: shift what you can out of the peak window this month, run the PSEG Time-of-Day calculator on your own data, and if your annual usage is above roughly 9,000 kWh, get a real solar and storage model built against your actual bill rather than an estimate. Systems designed in the fall typically get permission to operate before the spring rate climb.