Local Law 88 is the quieter member of NYC's energy-law family, but it does important groundwork for the rest. It targets two practical things in large buildings: upgrading lighting to current code, and sub-metering tenant spaces so energy use becomes visible. That visibility is what makes the bigger laws — especially Local Law 97 — achievable. Here is what LL88 requires and why it matters.
What LL88 requires
- Lighting upgrades — lighting systems in covered buildings (generally over 25,000 sf) must be brought up to current NYC Energy Code standards, including the required controls.
- Tenant sub-metering — tenant spaces above roughly 10,000 sf must have electrical sub-meters installed, and owners must provide tenants with monthly statements of their electricity use.
The compliance work was due by January 1, 2025, with reports filed alongside the law's filing fee. Missing it carries annual fines — on the order of $1,500 for a missing lighting or sub-metering report, plus a per-space penalty for each covered tenant space left without a sub-meter — assessed every year until you comply.
Why sub-metering matters beyond LL88
The point of sub-metering is behaviour. When tenants see their own electricity use itemised each month, consumption tends to drop — lights and equipment get switched off, waste gets noticed. That directly chips away at the plug and process loads that count fully toward a building's Local Law 97 carbon. In other words, LL88 hands owners the data and the incentive to cut exactly the loads that are hardest to design out.
The data dividend for modeling
Sub-metered data is also gold for energy modeling. Instead of relying on standard assumptions for plug loads and tenant schedules, a modeler can calibrate to what the building actually does — producing a far more reliable LL97 projection and a sharper read on which measures will pay off. The lighting upgrades, meanwhile, show up immediately as lower regulated energy. LL88 compliance and LL97 planning reinforce each other.
What owners should do
Confirm whether your building and tenant spaces are covered, close out any outstanding lighting and sub-metering filings to stop the fines, and then use the data — feed it into benchmarking, tenant engagement and a Local Law 97 model. The buildings that treat LL88 as a measurement foundation, not just a checkbox, get a head start on everything else NYC requires.
Turning LL88 data into an LL97 plan?
We use sub-metered and benchmarking data to build calibrated NYC energy models — turning Local Law 88 visibility into a concrete Local Law 97 strategy. Let's talk.
Get in touchThis article is general guidance and reflects information available at the time of writing. NYC requirements, thresholds, deadlines and fines are set by the City of New York and may change — always confirm current rules with the NYC Department of Buildings for your specific building.