Simplifying Energy-Storage Interconnection in New York: SIR to NYISO Class-Year

How Keentel Engineering guides developers through utility, SIR and NYISO pathways



The boom in clean-energy assets has pushed energy-storage systems (ESS) to the front line of grid reliability—but interconnecting a battery project in New York can feel like running three different marathons at once. Requirements vary by system size, point of interconnection, and whether you plan to trade in the NYISO wholesale markets. Keentel Engineering’s team of PE-licensed power engineers and NYISO veterans de-risks that journey from the first pre-app call to the final deliverability study.

Which interconnection path applies to your ESS?

(Need a primer on utility studies first? See our in-depth Power-System Studies)

Step-by-step roadmap we manage for you

1. Pre-Application Report – confirms feeder capacity and voltage constraints.
2. Preliminary Screening / Supplemental Analysis – screens for reverse power flow, flicker, fault duty.
3. CESIR – full utility engineering review; we model upgrades, relaying and anti-islanding.
4. NYISO Feasibility, SIS & Facilities Study – for projects > 20 MW or any market-participant asset.
5. Deliverability Analysis (CRIS) – secures capacity revenues; we handle Class-Year enrolment and cost-allocation.

Pro tip: run utility CESIR and NYISO SIS in parallel; Keentel’s dual-track process routinely saves 4-6 months.

Energy-Storage Interconnection — FAQs

1. Which projects follow New York’s Standardized Interconnection Requirements (SIR)?

Battery or hybrid resources ≤ 5 MW AC that connect at distribution voltage use the SIR path, ending with a CESIR if required.

2. When must I involve NYISO?

If you plan to sell into NYISO’s wholesale markets or interconnect to a FERC-jurisdictional line, you must file under NYISO SGIP (≤ 20 MW) or LFIP (> 20 MW).

3. What if my project fails Preliminary Screening?

You can trim the design to pass, request a Supplemental Analysis, or move straight to a full CESIR.

4. What is a CESIR study?

5. How do I check if my distribution circuit is FERC-jurisdictional?

Email NYISO’s Interconnection queue team (icpc@nyiso.com) with the feeder number and POI; they’ll confirm status.

6. What is NYISO’s Fast-Track option?

Inverter-based projects < 5 MW that meet voltage and distance screens can skip parts of SGIP for quicker approval.

7. What application fees should I budget?

Expect about $750 for a Pre-App report, $2,500 for Supplemental Analysis, and $10 k + for NYISO SIS/Facilities studies, rising with project size.

8. Define the Class-Year Facilities Study.

NYISO’s annual, grouped Facilities Study that assigns system-upgrade costs and grants CRIS (capacity) rights.

9. How long does NYISO interconnection take for > 20 MW projects?

Typically 18–24 months, depending on SRIS results, Class-Year timing, and required upgrades.

10. Can Keentel manage utility and NYISO processes in parallel?

Yes—our dual-track approach handles both utility CESIR and NYISO SIS simultaneously, cutting total schedule months.

Proof in Projects — Keentel Energy-Storage Interconnection Wins

1. 4.5 MW Behind-the-Meter Battery | Utility SIR Path

• Challenge: Rapid approval under the Value of Distributed Energy Resources (VDER) tariff.
• Solution: Pre-application report, Appendix K package, and full CESIR coordination.
• Result: Utility “Notice-to-Proceed” in 8 months—record time for an SIR battery project.

2. 30 MW Front-of-Meter ESS | NYISO SGIP Fast Track

• Challenge: NYISO small-generator queue plus capacity-market deliverability.
• Solution: Feasibility → SIS → Facilities Study; secured ERIS & CRIS rights.
• Result: Entered NYISO market queue 6 months ahead of competing projects.

3. 9 MW Hybrid Storage | Expedited Utility Non-SIR

• Challenge: Tight local “Smart Grid” rules; avoid full CESIR cost.
• Solution: Pre-app + Supplemental Analysis, negotiated cost-sharing on minor upgrades.
• Result: Interconnection approved with no CESIR—saved ≈ $250 k in study fees.

4. 50 MW Transmission-Connected BESS | NYISO LFIP + Class Year

• Challenge: High deposits and a long LFIP timeline for a transmission POI.
• Solution: Site-control documentation, SRIS package, milestone tracking, Class-Year ranking strategy.
• Result: ERIS & CRIS rights secured in 22 months, clearing the way for financial close.
  
  

Each success shows how Keentel’s dual-track expertise—utility SIR/CESIR and NYISO SGIP/LFIP—compresses schedules and controls upgrade costs for battery-storage developers.

From a behind-the-meter battery NY pilot to a 50 MW BESS interconnection, every energy-storage interconnection succeeds by matching the right NYISO interconnection process. Keentel guides each project: first through the Standardized Interconnection Requirements (SIR) and its CESIR study New York utilities demand—then, if a FERC-jurisdictional distribution circuit or market play is involved, into NYISO SGIP requirements or the deeper NYISO LFIP study. We secure ERIS rights NYISO and CRIS rights NYISO, control upgrade costs in the NYISO Class Year study, and wrap up the final deliverability study battery storage—giving developers a bankable battery-storage interconnection New York can trust.

Why EPCs and IPPs choose Keentel

• Expertise: 30 + NYISO filings, multi-state P.E.s, and published IEEE PES papers on storage interconnection.
• Regulatory fluency — we speak PSC, FERC and NYISO tariff language, preventing costly re-studies.
• Economic optimisation — deliverability strategy often saves clients 15 % on upgrade cost allocations.

See the official NYISO Interconnection Procedures for reference—then let Keentel translate the fine print into a bankable schedule.

Ready to move from concept to COD?