map of NYISO region

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
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
Docket No. Date Issued Company Title
EL19-86-001 10/15/20 New York State Public Service Commission and New York State Energy Research and Development Authority
v.
New York Independent System Operator, Inc.
Order Addressing Arguments Raised on Rehearing
ER16-1404-001 07/16/20 New York Independent System Operator, Inc. Order on Rehearing and Compliance
ER20-922-000  04/16/20 New York Independent System Operator Order Granting Waiver
ER19-1949-000  02/20/20 New York Independent System Operator, Inc. Order on Compliance
EL13-62-001  02/20/20 Independent Power Producers of New York, Inc.
v.
New York Independent System Operator, Inc.
Order Granting in Part and Denying in Part Clarification and Rehearing
EL19-86-000  02/20/20 New York State Public Service Commission and New York State Energy Research and Development Authority
v.
New York Independent System Operator, Inc.
Order Denying Complaint
EL16-92-001  02/20/20 New York State Public Service Commission, et. al.
v.
New York Independent System Operator, Inc.
Order Granting in Part and Denying in Part Rehearing and Clarification and Rejecting Compliance Filing as Moot
ER16-1404-000  02/20/20 New York Independent System Operator, Inc. Order on Compliance
ER19-2276-000  01/23/20 New York Independent System Operator, Inc. Order Accepting Tariff Revisions and Directing Compliance Filing and Informational Report
EL18-188-000  01/23/20 NRG Curtailment Solutions, Inc. v. New York Independent System Operator, Inc. Order on Paper Hearing
ER18-1743-002  01/23/20 New York Independent System Operator, Inc. Order Denying Rehearing
Docket No. Date Issued Company Title
EL18-189-000  12/19/19 Independent Power Producers of New York, Inc.
v.
New York Independent System Operator, Inc.
Order Denying Complaint
EL19-39-001  12/19/19 Light Power & Gas of NY LLC
v.
New York Independent System Operator, Inc.
Order on Rehearing
ER17-905-002  12/19/19 New York Independent System Operator, Inc.
and
PJM Interconnection, L.L.C.
Order Denying Rehearing
EL19-39-000  06/20/19 Light Power & Gas of NY LLC v. New York Independent System Operator, Inc. Order Denying Complaint
EL19-30-000  05/16/19 LS Power Grid New York, LLC and LS Power Grid New York Corporation I Order Granting Abandoned Plant Incentive in Part and Rejecting in Part
EL18-33-000  04/18/19 New York Independent System Operator, Inc. Order on Paper Hearing
ER16-120-007  03/21/19 New York Independent System Operator, Inc. Order on Compliance
ER17-1561-002  02/21/19 New York Independent System Operator, Inc. Order Dismissing Request for Waiver as Moot and Accepting Effective Date
ER18-1598-001, EL18-77-000  02/21/19 New York Independent System Operator, Inc.
and
Central Hudson Gas & Electric Corporation
Order Accepting Revisions to Stated Transmission Rates in Response to the Commission's Order to Show Cause and Terminating Section 206 Proceeding
Docket No. Date Issued Company Title
EL18-188-000  12/20/18 NRG Curtailment Solutions, Inc.
v.
New York Independent System Operator, Inc.
Order on Complaint, Denying Tariff Waiver, and Establishing Paper Hearing
ER15-2059-002, ER13-102-008  02/15/18 New York Independent System Operator, Inc. Order Granting, in Part, and Denying, in Part, Rehearing, and Clarification, and Requiring Further Compliance
ER17-156-002  02/15/18 New York Independent System Operator, Inc. Order Conditionally Accepting Tariff Revisions and Requiring Further Compliance
Docket No. Date Issued Company Title
EL18-33-000  12/21/17 New York Independent System Operator, Inc. Order Instituting Section 206 Proceeding and Paper Hearing
ER16-120-001, ER16-120-003, EL15-37-002  11/16/17 New York Independent System Operator, Inc. Order on Compliance and Rehearing
ER15-572-000, ER15-572-002, ER15-572-006  11/16/17 New York Transco, LLC Letter Order Accepting Settlement Agreement
ER17-1310-001  11/16/17 New York Independent System Operator, Inc., New York Public Service Commission Order Accepting Tariff Revisions
ER16-835-000  01/19/17 New York Independent System Operator, Inc. Letter Order Approving Settlement
Docket No. Date Issued Company Title
ER17-144-000  11/17/16 New York Independent System Operator, Inc. Order Granting Waiver
ER16-120-000 and EL15-37-001  04/21/16 New York Independent System Operator, Inc. Order on Compliance and Rehearing
ER15-572-001, -004  03/17/16 New York Transco, LLC

New York Independent System Operator, Inc.

Central Hudson Gas & Elec. Corp.

Consolidated Edison Co. of New York, Inc.

Niagara Mohawk Power Corp.

New York State Elec. & Gas Corp.

Orange and Rockland Utilities, Inc.

Rochester Gas and Electric Corp.
Letter Order on Partial Settlement and Compliance
EL15-84-001  03/17/16 Caithness Long Island II, LLC

v.

New York Independent System Operator, Inc.
Order Denying Rehearing
ER16-168-000, -001  02/18/16 New York Independent System Operator, Inc. Order Accepting Proposed Tariff Revisions Subject To Condition
Docket No. Date Issued Company Title
EL14-26-000  11/19/15 New York Independent System Operator, Inc. Order On Compliance Filing
ER12-1653-005  11/19/15 New York Independent System Operator, Inc. Order On Compliance Filing
EL12-98-001 and EL12-98-002  11/19/15 Hudson Transmission Partners, LLC

v.

New York Independent System Operator, Inc.

New York Independent System Operator, Inc.
Order On Rehearing, Clarification, And Compliance Filing
ER13-366-004, -005 and ER13-367-002  04/16/2015 Southwest Power Pool, Inc. Order On Rehearing and Compliance Filing
EL11-50-001  04/16/2015 Astoria Generating Company L.P and TC Ravenswood, LLC
v.
New York Independent System Operator, Inc.
Order On Clarification and Rehearing
EL11-42-001, ER12-2414-000, 001 & 002  04/16/2015 Astoria Generating Company L.P.; et al. Vs. New York Independent System Operator, Inc. Order On Clarification, Rehearing, And Compliance Filing
EL13-62-000  03/19/2015 Independent Power Producers of New York, Inc.
v.
New York Independent System Operator, Inc.
Order Denying Complaint
EL07-39-006, ER08-695-004, and ER10-2371-000  03/19/2015 New York Independent System Operator, Inc. Order On Clarification, Rehearing, And Compliance Filing
ER14-543-001  03/19/2015 New York Independent System Operator, Inc.

Niagara Mohawk Power Corporation
Order Denying Rehearing
ER14-543-000  03/19/2015 New York Independent System Operator, Inc.

Niagara Mohawk Power Corporation
Order Establishing Hearing And Settlement Judge Procedures
ER15-37-000  02/19/15 New York Independent System Operator, Inc. Order Instituting Section 206 Proceeding and Directing Filing to Establish Reliability Must Run Tariff Provisions

This page was last updated on July 14, 2022