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Improved Transparency on Transmission Line Derates

This information policy change aims to enhance transparency by allowing timely public access to transmission line derate information, addressing the current lack of visibility. The proposed amendment would enable the ISO to release derate information to the public the day after it occurs, providing valuable insights for daily market transactions.

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Improved Transparency on Transmission Line Derates

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  1. Information Policy ChangesTo improve transparency on transmission line derates Citigroup Energy Inc. Constellation Energy Vitol

  2. Background • NERC alert issued last year • Requires transmission owners to inspect field conditions around their lines and derate lines that cannot operate at their designated ratings due to actual conditions. • Inspections ongoing now. • Derates and outages have occurred as a result of these inspections

  3. Problem • While outages are published on a timely basis on ISO website, there is not good transparency on derates • Only public information on line derates is the information included in monthly FTR models. • Monthly publishing of this information is not frequent enough to meet the needs of those transacting in the market on a daily basis.

  4. Information Policy Issue • The Information Policy is not clear about how transmission derate information that is released on a one day lag is treated • The release of real-time transmission line flows is prohibited. (Section 3(b)) • The release of transmission limits used in planning is allowed. (Section 3 (a))

  5. Proposed Change • Section 3(a): Public Information Includes: • Changes to transmission line ratings, which may be made available by the ISO on a next day basis.

  6. Discussion • The proposed change would allow the ISO to release transmission derate information to the public the day after the derate occurred. • The ISO has expressed some willingness to do this if these changes are approved.

  7. Questions?

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