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Iowa City approves $28.2M bid package for wastewater digester upgrade and renewable natural gas system
Summary
The City Council approved plans and a bidding schedule for a multi‑phase rehabilitation of the wastewater treatment plant digester complex, including a renewable natural gas system expected to produce revenue and cut energy use. The project is budgeted at about $36.2 million with an estimated payback of 12–15 years.
The Iowa City Council on June 3 approved plans and directed staff to solicit bids for Phase 1 of a rehabilitation of the city’s wastewater treatment plant digester complex, a project that includes production of renewable natural gas (RNG) and upgrades to aging infrastructure.
The vote clears advertisement of a $28,200,000 construction package for work the city estimates will total about $36,200,000, including interconnection and technical costs. The city expects about $3 million in Inflation Reduction Act rebates after the system is operating and a projected net revenue of about $1 million a year from tipping fees and gas sales, the project team told the council.
Why it matters: the rehabilitation replaces 20‑plus‑year‑old digester equipment, reduces the plant’s electrical use and aims to convert waste gas into pipeline‑quality natural gas…
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