City Skyline

Building Energy Efficiency

In September 2014, Mayor de Blasio released One City: Built to Last, a 10-year action plan to improve the energy efficiency of New York City’s one million buildings and achieve a 30 percent reduction in building-based GHG emissions by 2025. During the first year of implementation, the City has made progress on all 22 initiatives. These initiatives include the convening of a Building's Technical Working Group (TWG), launching the NYC Retrofit Accelerator, and taking steps to expand the successful Carbon Challenge.

Buildings Technical Working Group

Last year, following the release of One City: Built to Last and announcement of the City’s 80x50 commitment, Mayor de Blasio convened more than 50 leaders from New York City’s world-class real estate industry, architects, engineers, labor unions, academics, affordable housing experts, and environmental advocates to serve on the Buildings Technical Working Group (TWG).

The TWG was tasked with identifying the leading edge standards that should be developed for new construction and substantial renovations and the systems-specific efficiency measures for existing buildings that would be necessary to transform the city’s building stock to achieve deep carbon reductions.

To better understand the drivers of energy use in existing buildings and the opportunities to improve energy efficiency, the City conducted the most comprehensive analysis of energy use in New York City’s buildings to date.

The TWG also evaluated financial and regulatory structures that serve as opportunities and barriers to scaling up investments in energy efficiency and assessed the operations, maintenance, and training that will be needed to realize the full potential for GHG reductions. Throughout the process, the City assessed both the cost-effectiveness and the potential GHG reductions for all measures analyzed.

The efforts of the TWG have resulted in a plan that builds upon One City: Built to Last to place the City on a pathway to 80 x 50.

View the original press release and a list of participating TWG members.

More information is available on the Buildings Technical Working Group page.

NYC Retrofit Accelerator

Buildings That Make a Difference

The Retrofit Accelerator is part of the City’s commitment to the 80 x 50 goal. The program is a one-stop resource provided by the City for owners and operators of privately-owned buildings to help lower their energy and water costs and increase the value of their properties through energy and water upgrades, while making a positive impact on our environment.

The Retrofit Accelerator offers independent, customized technical assistance and advisory services at no cost to building owners to help accelerate the retrofit process for buildings that are 50,000 sq. ft. or larger. The Retrofit Accelerator’s team of experts works with building owners and operators every step of the way to complete their retrofit projects.

Learn more about the Retrofit Accelerator and how energy and water efficiency improvements can benefit your building and New York City.

The New York City Carbon Challenge

Started in 2007, the NYC Carbon Challenge is a voluntary leadership program for 17 of New York City’s leading universities, the 11 largest hospital organizations, 11 global companies, and 18 residential management firms that have pledged to voluntarily reduce their building-based emissions by 30-50 percent in 10 years. The program builds on a strong partnership between the City and the private and institutional sectors to pave a pathway towards New York City’s 80 x 50 goals.

The NYC Carbon Challenge works by inspiring a high-level commitment within organizations, creating a platform for the exchange of information and ideas and providing simple tools to track progress along the way. As they explore new ideas and opportunities to meet the Challenge goal, participants will also reveal effective strategies for energy efficiency that can be scaled up across New York City and beyond.

Learn more about the NYC Carbon Challenge.

The NYC Benchmarking Help Center

The NYC Benchmarking Help Center is a one stop shop for information, assistance, and answers to questions about Local Law 84 of 2009 (LL84), New York City’s benchmarking law. Benchmarking energy and water usage plays an important role in the Greener, Greater Buildings Plan, and is also valuable for improving building operations by providing building owners with a clear picture of overall energy and water usage, how they compare to usage in other buildings, and year over year comparisons that can help identify and prioritize energy saving opportunities and track progress.

The goal of the Help Center is to assist building owners with LL84, increase compliance rates, and improve data quality. The Help Center is here to help with questions about deadlines, if a building is required to comply, and navigating ENERGY STAR Portfolio Manager®. Trained staff will walk building owners through the steps, point to trainings and informational resources, and resolve problems so building owners can meet the May 1 deadline with time to spare.

The Help Center is available at 212-566-LL84 (212-566-5584),, or