NYSIO website

Map of NYISO

The creation of the New York Independent System Operator (NYISO) was authorized by FERC in 1998 and launched on Dec. 1, 1999. The NYISO footprint covers the entire state of New York. NYISO is responsible for operating wholesale power markets that trade electricity, capacity, transmission congestion contracts, and related products, in addition to administering auctions for the sale of capacity. NYISO operates New York’s high-voltage transmission network and performs long-term planning.

The chronic transmission constraints in NYISO are in the southeastern portion of the state, leading into New York City and Long Island. As a result of their dense populations, New York City and Long Island are the largest consumers of electricity. Consequently, energy flows from the west and the north toward these two large markets, pushing transmission facilities near their operational limits. This results in transmission constraints in several key areas, often resulting in higher prices in the New York City and Long Island markets

List of Orders

Docket No. Date Issued Company Title
ER24-1915-000 04/17/25 New York Independent System Operator Order on Compliance
Docket No. Date Issued Company Title
ER24-95-000 07/25/24 New York Independent System Operator, Inc. Order On Compliance Filing
Docket No. Date Issued Company Title
EL22-64-000 09/21/2023 New York Independent System Operator, Inc. Order on Show Cause Proceeding
ER21-2460-003  04/20/2023 New York Independent System Operator, Inc.  Order On Compliance Filing 
ER22-2350-000 04/20/2023 New York Independent System Operator, Inc. Order on Compliance Filing
EL22-15-001
ER22-1014-002
01/19/2023 New York Independent System Operator, Inc. and New York Power Authority Order on Compliance
Docket No. Date Issued Company Title
ER21-502-004 12/15/2022 New York Independent System Operator, Inc. Order on Remand
ER21-2460-002  10/24/2022 New York Independent System Operator  Order Addressing Arguments Raised on Rehearing 
EL21-7-000  09/22/2022 Cricket Valley Energy Center, LLC and Empire Generating Company, LLC v.  New York Independent System Operator, Inc. Order Denying Complaint
ER21-2460-000 06/17/2022 New York Independent System Operator, Inc. Order on Compliance Filing
ER20-1718-002 02/17/2022 New York Independent System Operator, Inc. Order Addressing Arguments Raised on Rehearing Setting Aside Prior Order and Accepting Tariff Revisions
Docket No. Date Issued Company Title
EL21-49-001 11/18/21 Hecate Energy Greene County 3 LLC v. Central Hudson Gas & Electric Corporation and New York Independent System Operator, Inc. Rehearing Order Addressing Arguments Raised on Rehearing
EL21-49-000 07/15/21 Hecate Energy Greene County 3 LLC v. Central Hudson Gas & Electric Corporation and New York Independent System Operator, Inc. Order Denying Complaint
ER20-716-004 06/17/21 New York Independent System Operator, Inc. Settlement 2 of 2

Settlement Letter Order

EL20-65-000 04/15/21 New York Independent System Operator, Inc.  Order on Petition for Declaratory Order
EL16-92-004 02/18/21 New York State Public Service Commission, et. al.
v.
New York Independent System Operator, Inc.
Order Addressing Arguments Raised on Rehearing, and Setting Aside Prior Order, in Part

This page was last updated on June 25, 2025