1.15 Definitions - O

Off-Peak:  The hours between 11:00 p.m. and 7:00 a.m., prevailing Eastern Time, Monday through Friday, and all day Saturday and Sunday, and NERC-defined holidays, or as otherwise decided by ISO.

On-Peak:  The hours between 7:00 a.m. and 11:00 p.m. inclusive, prevailing Eastern Time, Monday through Friday, except for NERC-defined holidays, or as otherwise decided by the ISO.

Open Access Same-Time Information System (“OASIS”):  The information system and standards of conduct contained in Part 37 of the Commission’s regulations and all additional requirements implemented by subsequent Commission orders dealing with OASIS.

Operating Agreement:  An agreement between the ISO and a non-incumbent owner of transmission facilities in the New York Control Area concerning the operation of the transmission facilities in the form of the agreement set forth in Appendix H (Section 31.11) of Attachment Y.

Operating Capacity:  Capacity that is readily converted to Energy and is measured in MW.

Operating Committee:  A standing committee of the ISO created pursuant to the ISO Agreement, which coordinates operations, develops procedures, evaluates proposed system expansions and acts as a liaison to the NYSRC.

Operating Requirement:  As defined in the ISO Services Tariff.

Operating Reserves:  As defined in the NYISO Services Tariff.

Operating Reserve Demand Curve:  As defined in the NYISO Services Tariff.

Operating Study Power Flow:  A Power Flow analysis that is performed at least once before each Capability Period that is used to determine each Interface Transfer Capability for the Capability Period (See Attachment M).

Operational Control:  Directing the operation of the Transmission Facilities Under ISO Operational Control to maintain these facilities in a reliable state, as defined by the Reliability Rules.  The ISO shall approve operational decisions concerning these facilities, made by each Transmission Owner before the Transmission Owner implements those decisions.  In accordance with ISO Procedures, the ISO shall direct each Transmission Owner to take certain actions to restore the system to the Normal State. Operational Control includes security monitoring, adjustment of generation and transmission resources, coordination and approval of changes in transmission status for maintenance, determination of changes in transmission status for reliability, coordination with other Control Areas, voltage reductions and Load Shedding, except that each Transmission Owner continues to physically operate and maintain its facilities.

Optimal Power Flow (“OPF”): The Power Flow analysis that is performed during the administration of the Centralized TCC Auction and Reconfiguration Auction to determine the most efficient simultaneously feasible allocation of TCCs to bidders.

Original Residual TCC:  A TCC converted from Residual Transmission Capacity estimated prior to the first Centralized TCC Auction and allocated among the Transmission Owners utilizing the Interface MW-Mile Methodology prior to the first Centralized TCC Auction.

Order Nos. 888 et seq.:  The Final Rule entitled Promoting Wholesale Competition Through Open Access Non‑discriminatory Transmission Services by Public Utilities; Recovery of Stranded Costs by Public Utilities and Transmitting Utilities, issued by the Commission on April 24, 1996, in Docket Nos. RM95‑8‑000 and RM94‑7‑001, as  modified on rehearing, or upon appeal.  (See FERC Stats. & Regs. [Regs. Preambles 1991‑1996] ¶ 31,036 (1996) (“Order No. 888"), on reh’g, III FERC Stats. & Regs. ¶ 31,048 (1997) (“Order No. 888‑A”), on reh’g, 81 FERC ¶ 61,248 (1997) (“Order No. 888‑B”) (Order on reh’g 82 FERC ¶ 61,046 (1998) (“Order No. 888‑ C”).

Order Nos. 889 et seq.:  The Final Rule entitled Open Access Same‑Time Information System (formerly Real‑Time Information Networks) and Standards of Conduct, issued by the Commission on April 24, 1996, in Docket No. RM95‑9‑000, as modified on rehearing, or upon appeal.  (See FERC Stats. & Regs. [Regs. Preambles 1991‑1996] ¶ 31,035 (1996) (“Order No. 889"), on reh’g, III FERC Stats. & Regs. ¶ 31,049 (1997) (“Order No. 889‑A”), on reh’g, 81 FERC ¶ 61,253 (1997) (“Order No. 889‑B”)).

Out-of-Merit Generation:  Resources committed and/or dispatched by the ISO at specified output limits for specified time periods to meet Load and/or reliability requirements that differ from or supplement the ISO’s security constrained economic commitment and/or dispatch.

The ISO may also use Out-of-Merit to reduce the CSR injection Scheduling Limit and/or the CSR withdrawal Scheduling Limit to protect NYCA or local reliability.  When the ISO does so the Out-of-Merit for NYCA or local reliability designation shall apply to each of the Generators that is subject to the affected CSR Scheduling Limit.