Carbon Lighthouse Retrofit Identifies $1M in Energy Savings
Carbon Lighthouse has completed a retrofit on a historic San Francisco office and retail building that the company says will save tenants more than $1 million in lifetime energy costs while eliminating 870 tons of CO2 per year over the 12- to 15-year lifespan of the project.
The Flood Building (pictured) is a downtown San Francisco landmark with more than 350 commercial and retail tenants, including flagship stores for Gap, Urban Outfitters and Anthropologie.
Built in 1904 — and a survivor of the 1906 and 1989 earthquakes — the Flood Building stands at 300,000 square feet and 12 floors.
Carbon Lighthouse began energy-efficiency upgrades in late 2012, and says these measures have already made the Flood Building more efficient than 75 percent of similar commercial buildings. In the project’s first year, tenants will receive a 15 percent reduction in utility costs, which translates to lifetime savings of about $4 per square foot, according to the company.
Carbon Lighthouse uses a propriety thermodynamics engine (MOE) that it says taps data to locate hidden-but-substantial energy savings. MOE taps into 12 years of weather satellite data and highly granular building characteristic data to accurately predict and model energy savings for 10 years in the future.
In the Flood Building retrofit, Carbon Lighthouse installed a computerized central management system that gives property management increased visibility and remote control over building operations. It also improved the building’s HVAC system by optimizing the balance between the speed of the building’s condenser water pumps and the temperature of water flowing through them. Finally, it completed lighting improvements, replacing and updating lighting in several areas of the building.
Late last year, Singapore property developer City Developments Limited completed infrastructure upgrades to its Republic Plaza building, one of Singapore’s tallest skyscrapers, and anticipates an annual energy savings of $712,000 or 4 million kWh.
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