NYISO September 2026 Capacity Auction: NYC Clears at $12.39/kW-Month
NYISO's September 2026 spot capacity auction cleared at $12.39/kW-month in New York City, $10.13 on Long Island, and $5.97 statewide and in the G-J locality. Versus August, NYCA and G-J rose 31.8% while NYC was nearly flat. Buyers should separate these wholesale results from account-specific ICAP tags, supplier reserves, delivery tariffs, and final contract rates.
What the September result changes
- →NYC stayed elevated: Zone J moved only four cents higher month over month, preserving a $6.42/kW-month premium over the statewide result.
- →G-J moved sharply higher: The G-J locality and NYCA both rose 31.8% from August, while Long Island was unchanged.
- →Retail exposure is account-specific: The auction price is one input. A buyer's ICAP tag, supplier methodology, reserve treatment, utility tariff, and contract terms determine bill impact.
September versus August: official spot-auction comparison
NYISO posted the September 2026 spot-auction results on August 28. The comparison below uses NYISO's published August and September locality prices. Percentage changes are KilowattLogic calculations, rounded to one decimal place.
| Locality | August 2026 | September 2026 | Monthly change |
|---|---|---|---|
| New York City (Zone J) | $12.35 | $12.39 | +$0.04 (+0.3%) |
| Long Island (Zone K) | $10.13 | $10.13 | $0.00 (0.0%) |
| G-J locality | $4.53 | $5.97 | +$1.44 (+31.8%) |
| New York Control Area | $4.53 | $5.97 | +$1.44 (+31.8%) |
NYISO also reports 12,699.9 MW of total awarded capacity for September, down from 13,817.4 MW in August. That is an 8.1% month-over-month decrease, but it should not be read as an 8.1% decline in power demand or customer capacity cost. Spot-auction positions can change with bilateral coverage, load-serving-entity obligations, locality requirements, imports, and available supply.
Why Zone J remains a separate procurement problem
New York City is a constrained capacity locality. NYISO requires enough qualifying capacity to be secured locally, so the Zone J result can remain well above the New York Control Area price even when statewide supply is sufficient. In September, NYC's $12.39/kW-month result was $6.42 above NYCA's $5.97 result—about 108% higher on a clearing-price basis.
That locality spread is a wholesale market signal, not an all-in commercial electricity rate. It does not include Con Edison delivery charges, energy supply, taxes, supplier risk premiums, or a customer's assigned capacity obligation.
How commercial buyers should use the result
- Confirm the capacity convention in each quote. Ask whether the offer fixes capacity, passes it through, or reserves the right to reconcile the customer's tag later.
- Validate the account's ICAP tag. A locality clearing price alone cannot estimate bill impact without the customer-specific kW obligation and supplier treatment.
- Compare like with like. A fixed all-in quote and a pass-through quote allocate capacity risk differently; the headline energy price may obscure that distinction.
- Keep delivery separate. Con Edison tariff and demand-charge changes are not captured by NYISO's spot capacity result.
Monthly capacity exposure depends on the account's capacity obligation (kW), the applicable locality price or supplier proxy, reserve and loss factors, and the retail contract's pass-through or fixed-price rules. Ask the supplier to identify every input before comparing offers.
Review your New York capacity exposure
Use the auction result as context, then compare your ICAP tag and supplier capacity treatment across offers.
Build account context →