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IID Board Approves Settlement Agreement with CAISO


The Imperial Irrigation District Board approved a settlement with the California Independent System Operators regarding the S-Line Upgrade Project.

The Imperial Irrigation District and the California Independent System Operator Corporation (CAISO) entered into a settlement agreement with respect to litigation. The settlement agreement provides that the CAISO will fund up to $40 million toward an upgrade of IID’s 230KV S-Line that allows for a scheduling right. The settlement agreement also provides that federal district court litigation between the CAISO and IID will be dismissed with prejudice once the term of the settlement, including the funding and construction of the S-Line upgrades, is met. The settlement also specifically provides that it is subject to the CAISO finding a new or existing participating transmission owner to fund the S-Line upgrades and obtain the relevant entitlements on behalf of CAISO. The participating transmission owner identified is an affiliate of Citizens Energy.

On behalf of CAISO, in its 2017-2018 CAISO Transmission Plan, it identified an economically-driven need for an upgrade to IID’s existing S-Line to mitigate thermal constraints and the CAISO made revisions to the scope of the S-Line upgrades in the 2018-2019 CAISO Transmission Plan.

The S-Line in its current configuration is an 18.1 mile, 230 kV single circuit wood pole transmission line running from the IID-owned El Centro switching station to the joint owned San Diego Gas & Electric Company and IID Imperial Valley Substation. The S-Line upgrade will provide benefits by removing a limitation to increased delivery from the Imperial area, in particular. The funding and construction of the S-Line upgrade is a key element to a settlement agreement between the CAISO and IID.

Implementation and settlement terms required negotiation of technical agreements within the framework of the CAISO tariff. IID worked with CAISO and Citizens and their various counsel and consultants on an agreement that are intended to fulfill IID’s and CAISO’s obligations under the settlement agreement.

The upgrade will have no impact on ownership or operation of the S-Line; the line will remain under IID ownership within the IID balancing authority area. Citizens will lease transfer capability in the upgraded transmission line and the right to schedule on the leased transfer capability will be turned over to CAISO for use.

Citizens will pay to IID up to a maximum of $40 million toward the upgrade of the 230kV transmission line. Citizens will file an application for cost recovery to be collected through the CAISO transmission access charge, and a petition for rate incentive associated with that cost recovery. Any cost that exceeded the $40 million will be borne by IID per the settlement. Separate from the S-Line upgrade but part of the settlement, IID will be required to upgrade the Bank 5 Transformers at the El Centro Switching Station at its own cost and expense. That upgrade will be brought to the board as a separate project in the future.

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