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Hetch Hetchy capital program reports ongoing shutdown work, cost increases on Moccasin projects
Summary
SFPUCreported progress on 22 Hetch Hetchy projects through Dec. 31, including a 100‑day system shutdown that completed major tunnel lining repairs, and forecasted cost increases (Moccasin powerhouse +$15M; Moccasin Dam +$23M) on several projects.
Katie Miller, Director of Water Capital Programs, summarized the Hetch Hetchy Capital Improvement Program through Dec. 31, 2024. She said staff added five new projects this fiscal year for a total of 22 tracked projects across water, power and joint water‑and‑power categories. Miller reported $65,000,000 spent in the first and second quarters and that there are currently 10 construction contracts underway.
Miller highlighted work completed during a recent 100‑day winter shutdown (Dec. 5 to March 10): installation and testing of new bulkheads at O'Shaughnessy Dam, 100% completion of mountain tunnel lining repairs during the shutdown and significant progress on several large construction elements. She noted forecast cost increases on specific projects, including a $15,000,000 forecast for Moccasin powerhouse systems upgrades and a $23,000,000 forecast increase for Moccasin Dam reservoir long‑term improvements, attributed to recent escalation in concrete and steel costs.
Miller described ongoing planning for Moccasin penstocks rehabilitation with alternatives under study (deep shaft, buried pipelines, above‑ground pipelines) and geotechnical investigations planned for the coming year to refine alignment and cost estimates. She said some contracts achieved final completion while others advanced to notice to proceed; the San Joaquin pipeline valve and safe‑entry improvement work has multiple phases and related contracts coming for board approval.
Commissioners praised staff and asked detailed questions about nonconformance notices, schedule impacts and contract negotiations. Miller confirmed a nonconformance notice issued on a building element at the mountain tunnel project requiring tear‑out and rework, and said staff is requiring corrections and expecting the project to complete the remaining shutdown next winter.
Ending: Commissioners asked staff to return with contract approvals as needed and expressed appreciation for the site visits and the stationing of resources to complete the complex projects.
