Hawaii's Crumbling 1906 Dam Could Become a Renewable Energy Powerhouse

A century-old dam in Oahu, Hawaii, could soon take on a new role as a hydroelectric power source. Local engineer Ken Takeya has proposed transforming Wahiawa Dam into a pumped storage facility. The plan aims to tackle long-standing safety concerns while boosting renewable energy for nearby communities. Built in 1906, Wahiawa Dam has a troubled history, including a collapse in 1921 that forced a full rebuild. For years, the structure has failed to meet modern safety standards, with state regulators issuing deficiency notices and fines since 2009. Its undersized spillway poses a serious flood risk, particularly after heavy rains in 2026 forced evacuations for up to 5,500 residents in Haleiwa and Waialua. Private owner Dole Food Co. has avoided costly repairs, estimated at over $20 million, leaving the dam in a state of neglect.

Takeya's proposal would convert the site into a pumped hydroelectric storage facility. The system would generate extra power for the region while reducing flood threats to downstream homes and farmland. It could also help prevent soil erosion that harms nearby coral reefs at Kaiaka. Federal funding might cover dam repairs and energy upgrades, and the project could tie into a military land lease agreement.

However, the idea faces hurdles. The stream feeding the dam cuts through military-controlled land, complicating access. A large reservoir in Waialua would be needed, raising concerns among local stakeholders. Discussions are ongoing, with potential conflicts over land use and project scope. If approved, the hydroelectric upgrade could modernise Wahiawa Dam while addressing its safety flaws. The facility would supply renewable energy, protect communities from flooding, and reduce environmental damage. But resolving land disputes and securing funding will be key to moving the project forward.