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New York NYISO Interconnection Request Process (8-NY-b)

In New York, a hydropower developer must file an Interconnection Request with the New York Independent System Operator (NYISO) in order to connect a new generating facility, or merchant transmission facility to the New York State (NYS) Transmission System. A developer may also need to file an Interconnection Request with NYISO for material modifications to an existing large facility or modifications to an existing Interconnection Request. NYISO Transmission Expansion and Interconnection Manual, at § 3.1; NYISO Open Access Transmission Tariff (OATT) §§ 3.9, 4.5.8, 3.11, 4.5.9.


As New York State’s Independent System Operator, NYISO monitors reliability of the state’s power system and coordinates the daily operations to distribute electricity supply. New York State Department of Public Service – NYISO Website. Each large facility or small generating facility proposed by a generation developer or merchant transmission developer, must meet NYISO’s Minimum Interconnection Standard for reliability. NYISO Open Access Transmission Tariff (OATT) § 25.2. The NYISO Minimum Interconnection Standard is designed to ensure reliable access by the proposed project to the NYS Transmission System and to the Distribution System. NYISO Open Access Transmission Tariff (OATT) § 25.2.1.1. In addition, each large facility or small generating facility larger than 2 MW proposed by a generation developer or merchant transmission developer, must also meet the NYISO Deliverability Interconnection Standard before it can become a qualified Installed Capacity Supplier or receive Unforced Capacity Deliverability Rights. NYISO Open Access Transmission Tariff (OATT) § 25.3.1. The NYISO Deliverability Interconnection Standard is designed to ensure that the proposed project is deliverable throughout the New York Capacity Region where the project will interconnect. NYISO Open Access Transmission Tariff (OATT) § 25.3.1.

Depending on whether the facility is a large facility or a small generating facility will determine which NYISO Open Access Transmission Tariff (OATT) provisions apply and which NYISO Interconnection Request procedures the developer should adhere to.


NYISO Interconnection Request Process Process

8-NY-b.1 – Is the Project a 20 MW or More Generating Facility, or a Merchant Transmission Facility?

If the proposed hydropower project is twenty (20) megawatts (MW) or more generation facility, or a merchant transmission facility the developer must file a Large Facility Interconnection Request (LFIR) with the New York Independent System Operator (NYISO) in order to connect a new large facility to the New York State (NYS) Transmission System. A large facility is either a large generating facility or a merchant transmission facility. A large generating facility is a generating facility with the capacity of more than twenty (20) megawatts (MW). NYISO Open Access Transmission Tariff (OATT) § 30.1.

A generating facility is defined as the developer’s device for the production of electricity identified in the Interconnection Request. NYISO Open Access Transmission Tariff (OATT) § 30.1. A merchant transmission facility is the developer’s device for transmission of electricity identified in the Interconnection Request, proposing to interconnect to the NYS Transmission System. NYISO Open Access Transmission Tariff (OATT) § 30.1.

If the facility is not a large generating facility or large merchant transmission facility, the developer should go to element 8-NY-b.9 – Does the Facility Fall Under NYISO’s Small Generator Interconnection Procedures (SGIP)?

8-NY-b.2 to 8-NY-b.3 – Is the Project a New Large Generating Facility or Merchant Transmission Facility?

If the hydropower project is a new twenty (20) megawatts (MW) or more generation facility, or a merchant transmission facility the developer should initiate the Large Facility Interconnection Request process, see:

NYISO Large Facility Interconnection Request:
8-NY-g

8-NY-b.4 to 8-NY-b.8 – Is there a Modification to an Existing Large Facility or Project Currently in the Interconnection Process?

If there are no modifications to an existing large facility or project currently in the interconnection process, the developer should initiate the Large Facility Interconnection Request process, see:

NYISO Large Facility Interconnection Request:
8-NY-g

If there are modifications to an existing large generation or merchant transmission facility, or of a large facility project pending an interconnection request, the developer must provide NYISO with prior notice of any changes to the facility including differences from what was studied in the interconnection process or reflected in the interconnection agreement. A developer must submit a LFIR and obtain approval from NYISO to materially increase the capacity of, or make a material modification to the operating characteristics of, an existing large generation facility or merchant transmission facility that is interconnected with the NYS Transmission System or with the Distribution System. NYISO Open Access Transmission Tariff (OATT) § 30.1; NYISO Transmission Expansion and Interconnection Manual, at § 3.3.1.1.

Changes to an Existing Large Facility

A developer must provide notice to NYISO of any changes to an existing large facility, including differences from what was studied in the interconnection process or reflected in an interconnection agreement. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.2.1.

When a developer proposes changes to an existing large facility, NYISO must determine whether the change(s) are material modifications to the operating characteristics of the existing large facility such that the facility owner is required to submit a new Interconnection Request and undergo Interconnection Studies under the LFIP. If NYISO determines the change(s) are non-material the developer does not need to submit a new Interconnection Request or undergo NYISO Interconnection Studies. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.1.

NYISO will review the changes to determine whether such changes require the facility owner to submit a new Interconnection Request. Under the LFIP, any increase in capacity to an existing large facility requires a submission of a new Interconnection Request. In this context, “capacity” refers to the capability of the facility to produce or transmit MWs at a given ambient temperature and does not refer to the facility’s level of Capacity Resource Interconnection Service (CRIS). Also in this context, an “increase” includes those increases resulting from physical changes to the large facility or capability that a facility has that exceed the capability reflected in the interconnection process. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.2.1.

Note: NYISO must review any modifications to existing facilities interconnected with the NYS Transmission System other than increases in capacity, discussed above, to determine whether the change constitutes a material modification to the facilities operating characteristics. Material modifications refer to changes to the equipment, the configuration of equipment, or the Point of Interconnection of an existing large facility that result in a material difference in the defining electric characteristic of the large facility in a manner adverse to system reliability. Material adverse difference in electrical characteristics is defined in terms of: stability, voltage, thermal or short circuit impacts. Modifications that would result in an adverse impact that is at least a de minimus are non-material. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.2.1.

In considering a materiality request, NYISO presumes that the change(s) are material and a new Interconnection Request is required. The hydropower developer (facility owner) can rebut this presumption by providing information and/or analysis with its request to support a finding that the change(s) are non-material. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.2.1.

Like-and-kind replacements or refurbishments of existing equipment that is worn or damaged (e.g., maintenance) are not material modifications and do not require materiality determination. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.2.1.

Changes to a Project Currently in the Interconnection Process

When a developer of a large facility project (i.e., a project in the NYISO Interconnection process) reports changes to any information provided in the project’s Interconnection Request, NYISO must determine whether the proposed change(s) is a material modification such that the project would lose its queue position and be required to submit a new Interconnection Request to pursue the modified project. Changes determined to be non-material can be accommodated under the existing Interconnection Request and the modified project may continue through the NYISO Interconnection Request process under its current queue position. NYISO Transmission Expansion and Interconnection Manual, at § 3.3.4.1.

If NYISO determines that the modifications to the existing large facility or project currently in the interconnection process are material, the developer must initiate the Large Facility Interconnection Request process, see:

NYISO Large Facility Interconnection Request:
8-NY-g

8-NY-b.9 to 8-NY-b.11 — Does the Facility Fall Under NYISO’s Small Generator Interconnection Procedures (SGIP)?

A small generator project falls under NYISO’s Small Generator Interconnection Procedures (SGIP) if:

  • The small generator proposes to interconnect to either the NYS Transmission System, or FERC-jurisdictional distribution, and
  • At least some of the small generator project’s output may be available to the wholesale market.

NYISO Transmission Expansion and Interconnection Manual, at § 3.4.1.1.

If the small generation project falls under NYISO’s SGIP, the developer must initiate the Small Generating Facility Interconnection Request process, see:

NYISO Small Generating Facility Interconnection Request:
8-NY-h

A small generator project proposed to interconnection to non-FERC jurisdictional distribution and/or whose output would only serve local load does not fall under the SGIP, but a local transmission owner’s interconnection process. In addition, all small generator interconnections to the Long Island Power Authority (LIPA) distribution system fall under the LIPA interconnection process and are not subject to SGIP. NYISO Transmission Expansion and Interconnection Manual, at § 3.4.1.1.

If the small generation project does not fall under NYISO’s SGIP, the developer must initiate the Local Transmission Owner Interconnection Request process.




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Edit New York Independent System Operator
Manager Interconnection Projects
518-356-6025
tnguyen@nyisoabbazabbacom