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      • Markets and Operations
      • Transmission Operations and Services

      Transmission Outage Scheduling

      In this section

      • Transmission Operations and Services
      • Transmission Service Types
      • Transmission Outage Scheduling
      • OASIS Materials
      • Operational Transmission Limits

      Related Links

      • Long-Term Outage Report
      • Short-Term Outage Report
      • Transmission Element Derates
      • TTC Tables
      • Transmission Committee

      Access the annual Transmission Equipment Outage Coordination Report and other transmission outage reports. The annual Transmission Equipment Outage Coordination Report presents yearly metric achievements documenting the ISO’s compliance with certain provisions of the Transmission Operating Agreements. These provisions require the ISO to annually assess its efforts to coordinate transmission equipment outages.

      More Outage Reports and Other Data

      See ISO Express for a large selection of real-time and historical ISO data and reports that can help market participants make informed decisions. Related examples include:

      • Short-Term Outage Report
      • Long-Term Outage Report
      • Transmission Element Derates

      About the ISO’s Role in Scheduling Outages

      Among the ISO’s responsibilities as Regional Transmission Organization is the scheduling and coordination of transmission equipment outages (periods when equipment is out of service). Outages can last from 15 minutes to several weeks or months, and can be continuous or intermittent. There are two general types:

      • A planned outage is when equipment is taken out of service for maintenance or new construction, and the outage request is made with timely advance notice.
      • An unplanned outage is when equipment is forced out of service due to a problem, and the request is made on short-notice. Unplanned outages may also be requested on short-notice when an unexpected opportunity for maintenance arises.

      The ISO coordinates outages with New England transmission owners (TOs) and local control centers (LCCs) in accordance with:

      • The Transmission Operating Agreements entered into with TOs and LCCs, which define the ISO’s authority in these matters
      • The rules and requirements established in the ISO Tariff (see Section III: Market Rule 1)
      • ISO operating documents, including ISO system operating procedures related to outage scheduling and ISO Operating Procedure No. 3: Transmission Outage Scheduling (OP 3)
      • Related governing documents, including Federal Energy Regulatory Commission (FERC) Order 2000
      • Regional and national reliability standards

      Documents

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