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DOE OSTI · 3376154

Memorial Pools Energy Efficiency Retrofits

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Abstract

The National September 11 Memorial & Museum completed a retrofit of the submergible LED lighting fixtures in its North and South Memorial Pools, located at the World Trade Center site in New York City. The two one-acre pools are illuminated nightly by custom LED fixtures set into their base, and the original lights — in place since 2011 — had begun reaching the end of their useful life, leaving sections of the pools dim or dark. Rather than fully replacing the fixtures, the project team worked with the original manufacturer, Acuity Brands, to retrofit and reuse existing components across all eight pool walls (34 fixtures per wall), reducing cost and waste. Fixtures were shipped in custom crates to Minnesota for retrofitting, then reinstalled onsite by Memorial & Museum staff and contractor ABM. The team addressed two key technical challenges during the project: early leakage in retrofitted fixtures, resolved by introducing vacuum-sealing and nitrogen-fill testing before shipment; and chord damage during transit, resolved with custom-designed shipping crates. All eight pool walls were successfully retrofitted and reinstalled by August 27, 2025, ahead of the 25th anniversary of the September 11, 2001 attacks. Sitewide electrical consumption in September 2025 reflected an approximate 7% reduction, contributing to the institution's broader net-zero and LEED Gold sustainability goals.

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29 ENERGY PLANNING, POLICY, AND ECONOMY32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION42 ENGINEERING54 ENVIRONMENTAL SCIENCES9/119/11 Memorial9/11 Museumenergy efficiencyhistoric preservationLEDLEDsLEEDlight fixtureslightinglighting retrofitlighting systemsmemorial lightingMemorial PlazaMemorial Poolnet zeroNew York Citysubmergible fixturesunderwater lightingWorld Trade CenterWTC

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2026-07-01. Memorial Pools Energy Efficiency Retrofits. https://doi.org/10.2172/3376154

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