New York City’s pioneering Local Law 87 requires office and residential buildings to monitor their energy use, using detailed audits. In a study published today March 30 in the research journal Nature Energy, Constantine E. Kontokosta, Danielle Spiegel-Feld and Sokratis Papadopoulos of New York University discuss the impact of this requirement on building owners, looking closely at detailed energy use and audit data between 2011 and 2016 from about 4,000 buildings. As a result of the law, the researchers found that energy use fell by a modest -2.5% for multifamily residential buildings and -4.9% for office buildings.
“The results suggest that mandatory audits, by themselves, create an insufficient incentive to invest in energy efficiency at the scale needed to meet citywide carbon-reduction goals,” wrote the authors. “In the context of a comprehensive, data-driven energy policy, audit requirements can be used to target ‘deep’ retrofits, while automated or virtual audits could replace the existing need for traditional audit mandates.”
Energy use in existing buildings is responsible for an estimated 67% of all New York City carbon emissions, the authors wrote. More than 20 cities, including Austin, Chicago, and San Francisco, have adopted policies to increase data and transparency on energy use, seeking to encourage market interventions to reduce energy consumption and carbon pollution. New York City has led the way in this regard.
The New York University study seeks to inform urban energy policy decisions by comparing energy use in properties that have performed a mandatory energy audit with those that have not within New York City.