Every year, buildings over 25,000 square feet in New York City must report their energy and water consumption through Local Law 84's benchmarking requirement. While the actual data submission goes through EPA's ENERGY STAR Portfolio Manager, your building management system can make the process significantly easier — and more accurate.
More importantly, the benchmarking process isn't just a compliance checkbox. It's an opportunity to understand your building's energy performance and identify improvement opportunities.
What Local Law 84 Requires
- Enter building information into ENERGY STAR Portfolio Manager
- Report annual energy consumption (electricity, gas, steam, fuel oil)
- Report annual water consumption
- Submit the report to the City by May 1 each year
The City uses this data to calculate your ENERGY STAR score and publishes results publicly.
Where Your BMS Fits In
Your building management system doesn't replace utility data for benchmarking — you still need actual utility bills or automated meter feeds. But your BMS can significantly enhance your benchmarking process:
Verify Utility Data Accuracy
Cross-check utility bills against BMS meter data. Catch billing errors, meter calibration issues, or unreported tenant loads.
Provide Sub-Level Detail
Break consumption down by system: HVAC, lighting, base building vs. tenant loads, time-of-use patterns.
Track Performance Over Time
Show how consumption varies by season, impact of operational changes, anomalies indicating problems.
Setting Up Your BMS for Benchmarking Support
Energy Metering Integration
- Many utilities support automated data feeds
- BMS can receive this data directly
- Integrate via Modbus or BACnet
- Install on major loads (HVAC, DHW)
- Standard Modbus or BACnet protocols
- Integrate with BMS for visibility
Proper Trend Configuration
Interval: 15-minute intervals align with utility data
Storage: Keep at least 3 years for meaningful analysis
Organization: Structure for easy query and export
Calculated Points
Set up calculated points for useful metrics:
- Total building energy consumption (sum of all sources)
- Energy use intensity (kWh or BTU per square foot)
- Carbon emissions (based on grid emission factors)
- Heating degree day and cooling degree day correlations
From Benchmarking to Improvement
Set Improvement Targets
Based on your baseline:
- What score improvement is realistic?
- What EUI reduction is achievable?
- What does Local Law 97 compliance require?
Implement BMS Optimizations
- Optimize schedules based on actual occupancy
- Adjust setpoints to reduce overcooling/overheating
- Improve economizer operation
- Implement demand-controlled ventilation
- Tune equipment staging and sequencing
Common Benchmarking Mistakes
Incorrect Gross Floor Area: Portfolio Manager results are highly sensitive to building area
Missing Energy Sources: Don't forget district steam, emergency generator fuel, propane
Overlapping Meters: Don't double-count if you have master and submeters
Data Gaps: Utility data gaps distort your benchmarking results
Advanced: Real-Time Benchmarking
Some building owners are moving beyond annual benchmarking to real-time performance tracking:
- Daily EUI tracking: Monitor energy intensity in real time
- Weather-normalized performance: Compare actual to predicted consumption
- Fault detection: Identify equipment problems that waste energy
- Automated alerts: Notify when consumption exceeds expected levels
Getting Help
At Controls NYC, we help building owners connect their BMS capabilities to their benchmarking and compliance requirements. Whether you need help setting up energy monitoring, interpreting your benchmarking results, or implementing improvements, contact us to discuss your situation.
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