Mission-Old Town and Pacific DC Intertie Upgrade Projects Update
The California ISO is updating stakeholders on the status of the ISO’s consideration of expedited executive approval of the Mission-Old Town Flow Controller upgrade project and the Pacific DC Intertie upgrade project presented in a stakeholder call on April 25, 2017.
At this time, the ISO is intending to move forward with expedited executive approval of the Pacific DC Intertie upgrade project. However, the ISO is not intending to move forward with expedited executive approval of the Mission-Old Town Flow Controller upgrade project.
The ISO presented these two projects in a stakeholder call on April 25, 2017, which discussed possible expedited executive approval of the projects in accordance with the Business Practice Manual (BPM) Section 188.8.131.52 for the Transmission Planning Process. The BPM is available athttp://www.caiso.com/rules/Pages/BusinessPracticeManuals/Default.aspx.
The Mission-Old Town Flow Controller upgrade project involves the installation of Smart Wires flow control devices on two Mission-Old Town transmission circuits to partially mitigate contingency thermal overloading concerns for the summer of 2018 in the event of delays to other transmission projects under construction in the area. While comments received were generally favorable or were seeking clarifications, San Diego Gas & Electric has subsequently identified potential engineering and permitting challenges, calling into question the ability to meet the June 1, 2018 target in-service date and avoid other schedule impacts on transmission projects in the area. Given these concerns, the ISO will not be granting executive management approval of this
The Pacific DC Intertie upgrade project involves the cost sharing of what are expected to be relatively minor (hundreds of thousands of dollars) earthwork costs with other owners, including some who are not ISO participating transmission owners, to maintain Southern California Edison’s pro rata capacity share as the facility’s north to south rating moves from 3100 MW to 3220 MW. No comments were received on this project. Accordingly, ISO executive management intends to proceed with expedited approval, subject to receiving final cost estimates for the project.