What does Expedited, 50 kW AC or less require?

No application fee is required for systems of 50 kW or less. No general liability insurance is required. An optional pre application report costs $750, refunded against the application fee if the applicant applies within 15 business days of receiving it, and is delivered within 10 business days.

What does Expedited by exception, above 50 kW to 300 kW inverter based require?

An inverter based system in this band may stay on the expedited path if it is certified to UL 1741 SB with the specified settings and PSEG Long Island approves. A non refundable $750 application fee applies above 50 kW. Completeness, eligibility and approval are determined within 10 business days.

What does Standard, above 300 kW to 5 MW require?

A coordinated electric system interconnection review is cost estimated per project, invoiced within 10 business days of election and payable within 10 business days, with a construction milestone of 30 percent of estimated construction costs. A secondary meter above 300 kVA is permitted to 1.5 MVA case by case only, and primary metering is required above 1.5 MVA.

LIPA and PSEG Long Island small generator interconnection: tiers, fees and insurance

How the size is measured

the alternating current nameplate rating aggregated on the customer side of the point of common coupling, and for storage the AC inverter or converter nameplate rating. For a hybrid project it is the sum of the AC nameplate ratings of all generation and storage. Note that the net metering side of the LIPA tariff uses a different term, rated capacity, which the tariff never defines in AC or DC.

Size bands and what each one obliges

Expedited, 50 kW AC or less Size 0 to 50 kW	No application fee is required for systems of 50 kW or less. No general liability insurance is required. An optional pre application report costs $750, refunded against the application fee if the applicant applies within 15 business days of receiving it, and is delivered within 10 business days. Electronic submission through the Interconnection Online Application Portal PSEG Long Island inverter settings External disconnect above 25 kW, or at any size for a system capable of islanded operation
Expedited by exception, above 50 kW to 300 kW inverter based Size 50.001 to 300 kW	An inverter based system in this band may stay on the expedited path if it is certified to UL 1741 SB with the specified settings and PSEG Long Island approves. A non refundable $750 application fee applies above 50 kW. Completeness, eligibility and approval are determined within 10 business days. $750 non refundable application fee UL 1741 SB certification with PSEG Long Island settings PSEG Long Island approval of the expedited route
Standard, above 300 kW to 5 MW Size 300.001 to 5000 kW	A coordinated electric system interconnection review is cost estimated per project, invoiced within 10 business days of election and payable within 10 business days, with a construction milestone of 30 percent of estimated construction costs. A secondary meter above 300 kVA is permitted to 1.5 MVA case by case only, and primary metering is required above 1.5 MVA. $750 non refundable application fee Coordinated electric system interconnection review at cost 30 percent construction milestone payment SCADA at 500 kVA and possibly below
Study process, above 5 MW to under 10 MW Size 5000.001 to 9999.999 kW	Full study process. At 10 MW and above the project goes to the New York Independent System Operator instead. $750 non refundable application fee Full study process

The screens that decide it

Within the 25 kW residential net metering ceiling Limit 25 kW.
A residential solar customer is net metered only if the rated capacity is 25 kW or less and is no more than 110 percent of the last twelve months of load or a customer provided load letter. A residential farm customer reaches 100 kW and non residential 5,000 kW. Above the limit net metering does not apply and the customer is served under Service Classification 11 Buy Back. Note that rated capacity is never defined in AC or DC anywhere in the tariff.
Feeder penetration ratio against minimum concurrent load
There is no fifteen percent screen. Penetration is aggregate capacity on the feeder section divided by the minimum concurrent load, taken as the larger of all resources over minimum daytime load from 9am to 5pm and non solar resources over minimum nighttime load. Above 70 percent goes to supplemental screening and above 85 percent goes straight to the coordinated review. Where data are missing, minimum nighttime load may be assumed at 30 percent of peak and minimum daytime at 50 percent. A certified power control system is screened at its export limit rather than its nameplate.
Within the secondary service cable and service transformer rating
Screen P3 tests the rated kVA, or the power control system limit, against the secondary service cable or the service transformer rating. For storage it tests maximum charging power plus maximum load demand, so a battery can fail this screen on the charging side rather than the export side.

Ask the utility this, before you sell it

Is this address on a secondary area network? Interconnection to a LIPA secondary area network is not permitted at all, at any size.
Is the service on a primary lateral longer than 1,000 feet that also serves other customers? That sends the job straight to the coordinated review regardless of size, and no site survey would flag it.
What is the feeder penetration ratio and the reclosing delay? Above 50 percent penetration on a feeder whose reclosing delay is under 2.5 seconds, direct transfer trip is required at the applicant’s expense, which is a large cost.
What is the current Customer Benefit Contribution charge for this rate class and technology? The charge is mandatory for any system substantially interconnected on or after 1 January 2022, and the rate lives in an annually reissued statement rather than in the tariff.

Worth knowing before you quote

This is the most explicit published timeline in the group, all in business days: completeness 10, expedited determination 10, preliminary screening analysis 15, supplemental analysis 20, metering changes 10, witness test scheduling 10, post test 5, with applicant windows of 10 to elect, 15 to sign and 30 to cure. The external disconnect requirement has a trap: it applies above 25 kW, but also at any size to a system capable of operating when isolated from a synchronous source, which reaches a 10 kW residential solar and battery job with a grid forming inverter. It must sit within 10 feet of the metering point or service entrance, lock open with a 3 slash 8 inch shank padlock, and be labeled in permanent letters of 3 slash 8 inch or larger. Resources operate at unity power factor unless specified, and PSEG Long Island may require a control mode change at any time, implemented by the owner at their expense within 30 days. Re entry after a trip is delayed 300 seconds and automatic re entry may be prohibited entirely.

Source

LIPA Small Generator Interconnection Procedures for Distributed Generators and Energy Storage Systems Less than 10 MW, revised 1 July 2026, with the PSEG Long Island Technical Requirements and Screening Criteria and the LIPA Tariff for Electric Service of January 2025

Read and recorded 2026-09-12. Publicly owned utility, outside its state's interconnection rule. Its own published documents govern. The Long Island Power Authority is a state public authority operating its own tariff rather than under the New York Public Service Commission standardized interconnection requirements, with PSEG Long Island as operator.

All New York interconnection rules

Size bands and what each one obliges

The screens that decide it

Ask the utility this, before you sell it

Worth knowing before you quote

What to do with this