By Christian Bergland, Building Energy Exchange

On April 18, the New York City Council passed the Climate Mobilization Act (CMA), an ambitious legislative package aligned with the City’s 1.5°C Climate Action Plan. This plan represents New York City’s commitment to the carbon drawdown targets set out in the Paris Agreement, pledging the city to carbon neutrality by 2050. Central to the Climate Mobilization Act is Local Law 97, first-of-its-kind legislation placing emissions limits on New York City’s large buildings, both commercial and residential.

A new department, the Office of Building Energy and Emissions Performance, will be charged with implementing and enforcing CMA policies. This department, headed by a design professional, will work in concert with City agencies and offices towards successful realization of the CMA’s goals. To this end, Local Law 97 also includes provisions for the creation of an advisory board tasked with hammering out detailed recommendations on the bill’s effective implementation and enforcement.

Requiring that buildings do their part to meet 80 x 50’s GHG reduction goals, Local Law 97 outlines two introductory compliance phases, with an initial period of 2024-2029. While some CMA specifics are set to be determined by the new department, initial compliance limits are fairly rigid, and are set to target those New York City buildings with the highest emissions intensity levels. Limits for the second compliance period of 2030-2034, meanwhile, are in line with the City’s interim emissions reduction goal of 40% by 2030 (40 x 30). The Office of Building Energy and Emissions Performance will have some discretion in determining the compliance path and the carbon calculation process through the rulemaking process, but the 40% reduction limit is explicit in the legislation, with a requirement that any adjustments to emissions limits be at least as stringent as those laid out in the bill.

In addition to Local Law 97, the Climate Mobilization Act includes a number of other laws geared towards moving New York City’s buildings towards the City’s 80 x 50 goals, including:

Local Laws 92 & 94 – Green Roofs & Solar PV: Requiring green roofs solar PV systems on certain new construction and renovation projects.

Local Law 95 – Building Labeling: Adjusting metrics used for letter grades assessing building energy performance.

Local Law 96 – PACE: Establishing clean energy financing tools for building owners (more on this below).

Local Law 98 – Wind Energy: Obliging the Department of Buildings to include wind energy generation in its toolbox of renewable energy technologies.

Thankfully, there are resources to help building owners navigate this evolving regulatory landscape. The NYC Retrofit Accelerator supports building owners’ efforts to improve their buildings’ energy efficiency. At the state level, NYSERDA has a number of programs geared towards putting buildings on the path to energy efficiency. And, of course, Building Energy Exchange is here to ensure that building owners have a thorough understanding of options to improve their buildings’ energy usage profiles.

Does Local Law 97 apply to my building?

The bill broadly applies to buildings 25,000 square feet and larger, or to two or more buildings on the same tax lot together exceeding 50,000 square feet. Excluded from the bill are houses of worship, buildings with one or more rent-regulated units, and other forms of affordable housing.

How are emissions limits determined?

Emissions reduction targets are in line with the roadmap set out in the 1.5°C Climate Action Plan, and represent a 40% carbon reduction by 2030 and an 80% carbon reduction by 2050 relative to 2005 levels. Limits are assigned according to building occupancy type, with accommodations made for energy-intensive facilities involved in healthcare. Emissions limits for both the first and second compliance periods may be adjusted through the rulemaking process. Limits are set to become significantly more stringent during the second compliance period, evidenced by the table below. Local Law 97 allows for these limits to be adjusted by rulemaking, it mandates that any adjustments must be at least as stringent as the emissions limits put forth in the bill.



*Limits for 2035-2050 period will be determined by the Office of Building Energy and Emissions Performance, but the legislation sets out a citywide average emissions intensity target of 0.0014 tCO2e/sf/yr for all covered buildings by 2050, a roughly 60% reduction beyond the 2024-2029 limits.
**Average emissions limit across all building types. Specific sector limits will be set by rulemaking in the coming years.

Building emissions are determined according to designated greenhouse gas coefficients for various fuel types. While the bill assigns coefficients for the initial compliance period, those for subsequent compliance periods will be determined via the rulemaking process. Local Law 97’s emissions reduction targets, including its increased stringency from 2030 onward, is premised on New York City’s electric grid becoming much cleaner in the future.

A cleaner grid will allow building owners to tap into emission savings by converting from polluting carbon-fueled building systems to cleaner systems powered by electricity from the grid. Large-scale offshore wind farms, increased solar capacity, linkages with Quebec hydropower, and movement towards a decentralized grid together promise to modernize our grid and increase electrification’s viability as a sustainability measure.

How can I pay for necessary building improvements?

Local Law 96 of the Climate Mobilization Act lays the groundwork for a property assessed clean energy (PACE) program. PACE financing is tied to a property rather than property owners, meaning that repayment obligations are transferrable when a property changes ownership. This distinction helps mitigate property owners’ concerns about upfront costs relative to long-term energy savings.

Does the bill include any alternative compliance pathways?

Yes, the bill includes several alternative compliance pathways to help building owners meet their carbon reduction mandates, including:

Carbon Offsets

During the first compliance period, up to 10% of a building’s annual emissions limit can be deducted with the purchase of greenhouse gas offsets, also known as carbon offsets. Offsets are credits generated in response to greenhouse gas reductions by a given party that can then be purchased by or exchanged with other parties to compensate for emissions in excess of defined emissions limits. New York City’s specific rules surrounding offset purchases will be determined through rulemaking, with a mandate for strong consideration of environmental justice concerns. The role of offsets in subsequent compliance periods has yet to be determined.


In addition to offsets, building owners also have the option of purchasing unlimited renewable energy credits (RECs), also known as renewable energy certificates, to be deducted from their reported annual building emissions for electricity consumption. RECs are generated through the production of energy by renewable sources, per Local Law 97 and by convention denominated in megawatt hours (MWh). The bill requires that RECs represent energy that is deliverable to the NYC area (meaning no wind power credits from Texas, for example) and generated in the same year as the building emissions for which they are compensating. Local Law 97 also mandates that RECs must only be used for compliance with this particular bill and cannot be used in conjunction with other compliance mandates (essentially: no double dipping).

Carbon Trading

Carbon trading represents another potential alternative compliance pathway. Local Law 97 mandates that the City study the development of a citywide emissions trading scheme (ETS) focused on greenhouse gas emissions from buildings by 2021. Emissions trading, also known as cap and trade, allows for covered parties – in this case, building owners – to balance their emissions with credits purchased from other parties whose building emissions fall under the emissions threshold. In practice, carbon trading might also allow for property owners with large portfolios – universities and major real estate companies, for example – to offset the poor performance of some of their buildings with exemplary performance from others. Tokyo currently has the world’s only buildings-based emissions trading scheme, and might serve as a model for New York City. As with greenhouse gas offsets, Local Law 97 mandates that the study incorporate environmental justice concerns so as to avoid localized pollution increases.

Hardship Waiver

Buildings facing financial difficulties, defined by the application of tax liens or property tax exemptions, may be temporarily exempt from Local Law 97.

Emissions Limit Adjustment

A building facing mandated emissions reductions in excess of 40% of its overall emissions may receive an emissions limit reduction equivalent to 70% of the building’s emissions limits in the 2018 calendar year.

Is everything set in stone?

No. While Local Law 97 establishes guidelines for limiting New York City’s building emissions, many of the specifics have yet to be ironed out. As noted, while the bill includes guidelines for greenhouse gas coefficients during the initial compliance period, subsequent standards will be set through rulemaking. In addition, the emissions limits are subject to change and lack specific guidelines for 2035 onwards.

While there exists some ambiguity regarding specific policies moving forward, there are still concrete steps you can take today to move your building towards compliance.

Where can I find information on how to improve my building’s energy performance?

The Building Energy Exchange has developed a catalogue of published reports and case studies illuminating diverse potential compliance pathways for building owners. Specific resources of interest include:

Tech Primers offer an introduction to leading-edge efficiency solutions limiting building energy use.

High Performance Retrofit Track: Participant Profiles highlight successful building retrofits completed by some of New York City’s most forward looking building owners.

Turning Data Into Action utilizes New York City’s building energy usage benchmarking data to assess energy efficiency pathways for various building types.

Pursuing Passive details the theoretical retrofit of an actual mid-century post-war building to the Passive House standard.

Better Steam Heat identifies opportunities for improving steam heating systems in large multi-family buildings.

Lighting the Way offers guidance on commercial lighting system upgrades that can reduce energy use.

Visit our Resources page for more!

In addition to our resources, the Building Energy Exchange offers the Passive House Primer, a one-hour seminar on Passive House fundamentals and their application in the NYC market.

Outside of the Building Energy Exchange, other organizations include the New York City Retrofit Accelerator, supplying building owners with free advisory services to streamline the building improvement process. Building owners in need of financing assistance can work with New York City Energy Efficiency Corporation, a non-profit specialty finance company geared towards providing custom-tailored solutions to close financing gaps for clean energy projects. For those involved in the construction and building-maintenance trades, GPRO offers training in high-performance sustainability methods.

Still have questions? Visit our Climate Mobilization Act Series website, a series we’ve developed to demystify the components of the Climate Mobilization Act and connect our community with relevant solutions.


  • Codes & Policy
  • Climate Mobilization Act

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