Carbon Lighthouse identified and delivered projects that if paid for up-front would have yielded Kilroy a 265% ROI at 250 and 301 Brannan. Instead of paying upfront, Kilroy opted to pay over time resulting in $0 of out-of-pocket costs while still earning a combined lifetime savings of $276,000. First year savings are $26,900. Additionally and in alignment with Kilroy’s sustainability goals, carbon emissions were reduced by 886 tons per year, the equivalent of planting 20,000 trees.
“The Carbon Lighthouse team is highly competent and professional, and my engineers reported that they really liked working with the CL team.”
Sara Neff, VP of Sustainability
The Nuts & Bolts: Our Process
Our engineers deployed sensors in both buildings to collect data that even the most sophisticated Building Management System (BMS) is not equipped to capture. This level of detail identified a unique opportunity to overhaul the HVAC controls and BMS at 250 Brannan. Using the unique in-building data they collected from our sensors, our team upgraded and web-enabled the HVAC system controls. These updates resolved several long standing controls problems between central controllers and unit controllers, also resolving building pressure issues that had been causing problems for years. Other upgrades our engineers made on their path to delivering Kilroy large returns were upgrades to the boilers and parking garage exhaust fans, and a new level of increased control over operations including fixture by fixture occupancy sensors in some tenant spaces.
At 301 Brannan, Carbon Lighthouse’s sensors and analysis revealed fewer opportunities for improvements resulting in a more limited scope of improvements. One opportunity they did reveal was to separate the controls for the central air handler unit from the central boiler and cooling tower. This allowed our team to install a warm-up period that would lock out outside-air when the building was unoccupied, significantly reducing the energy required to reach a comfortable temperature for the office spaces. Occupancy data collected led our team to make some lighting upgrades as well, replacing halogen lights with LEDs and upgrading stairwell fixtures from T12s with magnetic ballasts to T8s with bi-level control.
These two Carbon Lighthouse projects generated deep savings for Kilroy at no out-of-pocket cost. Kilroy now enjoys a leasing advantage in one of the most competitive CRE markets in the country, earned a great return, and helped the firm demonstrate their commitment to sustainability through action.