PSEG Long Island Solar Buyback Rates Explained

Ask three Long Island solar installers what PSEG-LI “pays” for excess solar power and you’ll likely get three different-sounding answers — because the real mechanism, net metering with an annual true-up, doesn’t work like a simple buyback rate. It works like a rolling credit balance that only converts to cash once a year, and only for whatever’s left over.

How PSEG-LI actually values your exports

When your panels produce more than the house is using — a sunny Tuesday afternoon in June, for instance — the surplus flows onto the grid and PSEG-LI credits your account at the full retail supply rate, currently around $0.27–$0.31/kWh depending on season and rate class. That credit isn’t a check; it’s a line item that offsets a future bill, the same way a gift card offsets a future purchase.

Those credits accumulate month to month for a full 12-month cycle. Produce more than you use in July and August, when panels run hardest and Long Island’s central-AC load peaks right alongside them, and you bank a credit balance that draws down through the shorter, lower-production days of December and January. That summer-to-winter carry is a big part of why solar pencils out here despite a latitude that gets real winters.

The true-up: where “buyback” actually happens

Once a year — typically the April billing cycle — PSEG-LI runs a true-up on any solar account still carrying a credit balance. Whatever’s left over gets paid out, but not at the retail rate you earned it at. The true-up pays an avoided-cost rate, roughly $0.08–$0.10/kWh, which is what PSEG-LI would have paid a wholesale generator for that same power. That’s close to a third of retail value.

This is the part that trips people up: “solar buyback” sounds like a flat per-kWh price PSEG-LI pays for everything you send back. It isn’t. Most of your exported power never reaches the true-up at all — it gets consumed as bill credit at full retail value first. Only the leftover, after a full year of netting against your own usage, gets cashed out at the lower rate. A well-sized system should see very little hit that floor.

Why this makes system sizing the real lever

The buyback structure means the financial return on your array isn’t just about total production — it’s about how much of that production gets used as retail-value credit versus how much spills into the true-up. Our residential solar installation design process starts from your trailing 12-month PSEG-LI usage specifically because of this math.

A tight-sized system. A house pulling 9,000 kWh/year with an 8 kW array (roughly matched to that usage under Long Island’s ~4.3 peak sun hours) will produce close to what it consumes across the year. Nearly all of that production either offsets real-time usage directly or earns a retail-rate credit that gets drawn down within the same cycle. Very little ever reaches the low-value true-up.

An oversized system. The same house with a 10.5 kW array — sized for “future-proofing” without a specific plan — will overproduce relative to usage for most of the year. The overage banks as credit, but by April there’s more sitting unused than a tightly-sized system would ever accumulate, and it converts to cash at roughly a third of what it would have been worth as an offset.

Oversizing isn’t always wrong — see the EV and heat pump note below — but it should be a deliberate call tied to a known future load, not a rounding-up decision made at the proposal stage.

When oversizing actually makes sense

Buyback economics change the calculus once you know a major new electric load is coming. A homeowner in Northport planning to add a heat pump within two years, or a Huntington family that’s already ordered an EV, is going to add several thousand kWh of annual usage that doesn’t exist yet in this year’s PSEG-LI bill. Sizing to today’s usage alone would leave that future load running mostly on grid power at retail rates.

In that case, a moderately oversized system captures value two ways: it produces at retail-offset value once the new load exists, and in the interim, the “excess” production banks credit that softens the bill during the gap. The true-up cost of temporary overproduction is often smaller than a year or two of paying full retail for an EV’s charging load. Our install process walks through how we ask about planned loads — EV timeline, heat pump conversion, pool — before finalizing array size, specifically to make this call with real numbers instead of a guess.

Time-of-use and the SC1-VS rate

Most Long Island residential accounts sit on PSEG-LI’s flat SC1 rate, where the retail credit value is the same regardless of when the export happens. A smaller number of homeowners are enrolled in PSEG-LI’s time-of-use rate, SC1-VS, where the commodity rate — and therefore the value of a net-metering credit — shifts by hour. On TOU, a credit earned during a summer weekday afternoon peak is worth meaningfully more than one earned at 10am on a spring weekend, because it’s valued at the rate in effect at export, not at consumption.

If you’re already on TOU, or considering switching for other reasons, that’s worth flagging on the first call — it changes not just the bill math but sometimes the recommended orientation and tilt, since maximizing afternoon production becomes more valuable than maximizing total annual kWh. For everyone else on flat SC1, the buyback math above applies without the extra layer.

How battery storage changes the buyback math

Adding a battery shifts some exports from “sold” to “stored.” Instead of pushing midday surplus onto the grid for a retail credit, a battery-equipped system can hold that surplus and discharge it that evening — covering usage that would otherwise be pulled from the grid at retail purchase price. For a homeowner who’s already sized tightly to annual usage, this doesn’t change the true-up outcome much, since there was little surplus reaching the true-up anyway.

Where it matters more is for storm-season resilience and for homes carrying a moderately oversized array for a planned EV or heat pump. A battery captures the midday surplus that would otherwise wait around as a bill credit and puts it to work covering evening load directly, which is a better outcome than either the retail credit or the avoided-cost true-up. Our battery storage page covers sizing a battery against Long Island’s outage patterns specifically — PSEG-LI’s above-ground distribution lines see more storm-driven outages than underground urban grids, which is a separate reason Long Island homeowners add storage beyond the buyback-rate math covered here.

Where buyback fits with the rest of the incentive stack

Net metering credits are one piece of a larger incentive picture that includes the 30% federal Investment Tax Credit, NYSERDA’s NY-Sun rebate, and New York State’s 25% solar tax credit — all of which reduce the up-front install cost rather than the ongoing energy value. Our full incentives breakdown covers how those stack, and how the combination typically compares against a straight cash purchase versus financed system on a Long Island roof.

Real Long Island install case studies show this play out with actual PSEG-LI bills: homeowners who sized close to usage saw true-up payouts in the low hundreds of dollars or less, while a couple of case studies with intentionally oversized systems — tied to a documented EV purchase — carried a larger true-up balance for one cycle before usage caught up to production.

The bottom line on PSEG-LI buyback rates

There’s no flat “we pay you $X per kWh” number to quote, because the real structure pays two very different rates depending on whether your export offsets your own future usage (retail, ~$0.27–$0.31/kWh) or survives a full year unused (avoided-cost, ~$0.08–$0.10/kWh). The homeowners who get the best return aren’t the ones with the biggest arrays — they’re the ones whose array size matches their actual and near-term electric load closely enough that almost none of their production ever sees the lower rate.