Introduction
New York City has moved beyond climate promises. The action is happening, and it starts with buildings. With sweeping legislation and ambitious carbon reduction targets, the city is reshaping how buildings operate, electrify, and interact with the grid.
At the heart of this transformation is Local Law 97 (LL97). Passed in 2019, LL97 is a landmark mandate designed to slash emissions from buildings, which are the city’s largest source of carbon pollution.
As the push for electrification accelerates, Battery Energy Storage Systems (BESS) have become a key part of the solution. They’re helping buildings smooth their demand profiles, enhance resilience, and make better use of renewable energy.
But here’s the thing: Not all battery systems are created equal, and not all are optimized for LL97 compliance.
At EticaAG, we’ve developed LiquidShield and HazGuard to address the real-world challenges that building owners face when adding energy storage, especially in dense, electrified environments like New York City. In instances like LL97 compliance, where emissions caps are strict and safety is non-negotiable, these technologies offer the performance, efficiency, and resilience that modern infrastructure demands.
In this article, we’ll break down how LL97 works, where BESS fits in, and how EticaAG’s solutions can help your building stay ahead of regulatory pressure.
What is Local Law 97?
If your building is over 25,000 square feet and located in NYC, LL97 likely applies to you. Passed as part of the Climate Mobilization Act, the law targets emissions from large buildings, which account for nearly 70% of the city’s carbon footprint.
LL97 sets annual greenhouse gas (GHG) emissions caps for buildings based on occupancy type. The law kicks into effect in two major compliance periods:
- Phase 1 (2024 to 2029): This phase sets initial emissions limits that are generally less stringent. Most buildings can meet these targets with moderate efficiency upgrades and operational improvements.
- Phase 2 (2030 to 2050): Emissions limits become significantly stricter in this phase. Buildings will be required to make deeper reductions in carbon output, often involving major system upgrades, electrification, or integration of clean energy technologies.
Every year, building owners must submit GHG data to the NYC Department of Buildings (DOB) via an online portal. And failure to comply is expensive. We’ll get into the fines shortly.
LL97 applies to:
- Individual buildings over 25,000 sq. ft.
- Grouped buildings on the same lot exceeding 50,000 sq. ft.
- Co-ops, condos, commercial towers, universities, healthcare institutions, and more
In short, if you’re managing a large building in NYC, this law is coming for your emissions, and you need a strategy.
LL97 Compliance Timeline and Penalties
The first phase of LL97 started in 2024, and the city is actively enforcing reporting and emissions limits. That means buildings need to act now to avoid being caught off guard.
Here’s how the timeline works:
- 2024-2029: Most buildings will find these initial emissions caps achievable with moderate retrofits, equipment upgrades, and operational improvements.
- 2030 and beyond: Emissions limits become significantly stricter. This is the stage where deep decarbonization, including electrification and energy storage integration, becomes essential.
Penalties for Non-Compliance
- $268 per metric ton of CO₂ equivalent emissions above your building’s limit
- Additional fines for failure to file reports or submitting false information
For many buildings, non-compliance could mean hundreds of thousands of dollars per year in fines. It’s about sustainability and financial survival.
The good news? Smart investments in energy efficiency, electrification, and energy storage can keep you well below the limit.
How Buildings Can Comply: Retrofit, Electrify, and Optimize
To meet LL97 requirements, a one-size-fits-all approach won’t cut it. Each building needs a tailored strategy that balances cost, feasibility, and performance.
Here’s what we’re seeing work best:
- Energy efficiency upgrades: LED lighting, smart HVAC controls, better insulation, efficient windows, and building envelope improvements
- Fuel switching and electrification: Replacing fossil-fuel systems with electric boilers or heat pumps
- Renewable energy integration: Installing solar PV, especially when paired with BESS
- Demand optimization: Smart EMS/BMS systems to manage when and how energy is used
- Accurate GHG reporting: Benchmarking tools, submetering, and real-time carbon tracking
These strategies help you comply while reducing operating costs and building long-term asset value.
How LL97 Interacts with Battery Energy Storage Systems
Let’s talk about the elephant in the boiler room: electrification increases load. When you shift heating, cooling, and even transportation, like EV chargers, to electric power, your building’s electricity demand spikes. It’s a natural consequence of electrification, but one that must be managed carefully under Local Law 97.
This is where BESS become a critical tool. They’re central to how buildings control their GHG emissions profile.
Here’s what they do:
- Flatten demand curves by smoothing out spikes in electricity use
- Store clean energy from solar arrays or off-peak grid hours
- Reduce reliance on carbon-intensive peaker plants during high-demand periods
- Give building operators the flexibility to control how and when energy is consumed
But here’s the catch: If a battery system isn’t properly integrated or optimized, it can work against your emissions goals instead of supporting them.
Why BESS Matters Under LL97
Without optimized storage, buildings risk:
- Increased parasitic loads from inefficient cooling
- Performance degradation from thermal imbalances
- Higher GHG emissions due to misaligned demand and supply
- Missed opportunities to offset peak demand and reduce operating costs
You need to ensure your battery system isn’t just installed, but also intelligently integrated and energy efficient.
How Battery Systems Improve LL97 Compliance Outcomes
Done right, BESS can significantly improve your building’s emissions profile. Let’s break it down.
1. Emissions Reduction Through Demand Smoothing
By discharging stored energy during peak hours, BESS helps flatten your building’s demand curve. This reduces the need for grid power at the dirtiest times.
Lower peak = fewer emissions = better compliance.
2. Enhanced Renewable Energy Self-Consumption
If you have on-site solar, BESS allows you to store excess energy during the day and use it at night. That means more of your energy is clean, and you’re not exporting it at low-value times.
3. Electrification Synergy
Heat pumps, electric chillers, and EV chargers can cause sudden demand spikes. Batteries buffer these loads, allowing smoother electrification without compliance headaches.
4. Cost Avoidance and Regulatory Risk Reduction
By controlling when your building draws power, you reduce demand charges. And by keeping your emissions under the cap, you avoid those $268/ton fines.
Bonus: There are state and utility incentives (like from NYSERDA and Con Edison) for smart storage projects.
EticaAG’s Role in Future-Proofing LL97 Compliance
We didn’t just build technologies for energy storage. We designed them for real-world challenges like these: urban environments, aggressive emissions targets, and the need for fire-safe deployment in dense, high-stakes settings like New York City.
LiquidShield: Thermal Efficiency for Electrified Systems
LiquidShield is our proprietary immersion cooling solution. Instead of relying on traditional air conditioning or complex liquid-to-air loop systems, LiquidShield submerges battery cells directly in a thermally stable dielectric liquid that absorbs and dissipates heat at the source.
Why it matters:
- Reduces the HVAC burden of battery rooms or containers
- Keeps cell temperatures stable across seasons
- Increases charge/discharge efficiency
- Lowers total energy use, which is exactly what LL97 requires
Plus, it integrates seamlessly with EMS and BMS platforms, giving you real-time visibility for GHG tracking.
HazGuard: Safety That Enables More Aggressive Electrification
As LL97 pushes buildings toward electrification, urban safety becomes paramount. That’s where HazGuard comes in.
This is our gas neutralization system, built to handle toxic emission release during thermal event scenarios safely.
- Hazardous gases are vented into the TRAPS system.
- Specialized media neutralize hydrogen fluoride (HF), VOCs, and other toxics
- Enables indoor and rooftop deployments, even in high-density zones
- Compliant with FDNY, ASHRAE, and DOB standards
In other words: you can install storage where it matters, without risking fines or occupant safety.
Best Practices for LL97 Compliance with BESS
Let’s make this actionable. Whether you’re building new or retrofitting, here’s what we recommend:
- Design your BESS as part of your emissions strategy from day one
- Integrate with EMS/BMS systems that track GHG performance in real-time
- Choose low-energy thermal solutions, like immersion cooling, instead of air-cooled or fan-cooled systems
- Track performance across seasons, not just in one reporting cycle
- Work with consultants who understand both LL97 and BESS, not just general energy consultants
Proactive planning beats reactive retrofits every time.
To Meet LL97 Goals Buildings Need Smarter Storage Solutions
LL97 is the future of building operation in New York City.
Battery Energy Storage Systems can either help you get there or hold you back. The difference lies in how they’re designed, deployed, and managed.
EticaAG’s LiquidShield and HazGuard technologies were created with this future in mind. We make it easier for you to stay under your carbon cap, extend your system life, and operate with peace of mind, no matter how tight the regulations get.
Don’t wait for fines or failures to force your hand. Let’s build smarter, cleaner, and more resilient buildings together.
