LL97 penalty calculator
A simple estimate of annual Local Law 97 excess-emissions penalties for a multifamily building, from its gross floor area and one year of electricity and natural gas use. Enter the parking area separately - parking carries its own, much lower emissions limit.
Estimate only - multifamily buildings; verify with your RDP before filing.
Worked examples
Sample scenarios, already calculated
The same energy use in both examples - only the documented gross floor area changes. Either button loads its scenario into the calculator below.
Documented GFA, parking split out
A real Ridgewood condominium at its documented gross floor area - the pre-filled example below.
Same energy, GFA understated
With the floor area documented about 13,518 sq ft lower, the emissions limit shrinks and a penalty appears. The documented floor area decides the answer.
Inputs
Your building, one year of energy
Enter the gross floor area (GFA) in square feet - use the GFA documented for your LL97 filing, not an estimate from a listing site - plus the parking portion of that area, and the building's total annual electricity (kWh) and natural gas (therms). Results update as you type.
Total GFA as documented for the LL97 filing, parking included.
The parking portion of the GFA above. Leave 0 if the building has no parking area in its GFA.
Total building electricity for the year.
Total building natural gas for the year. 1 therm = 100 kBtu.
Results
Estimated penalties, by compliance period
2024-2029
2030-2034
An estimated penalty is $0 when emissions are at or below the period limit. The pre-filled example is a real Ridgewood condominium at its verified gross floor area.
Method
Coefficients used
Emissions coefficients and emissions limits per 1 RCNY 103-14.
| Item | Value |
|---|---|
| Natural gas coefficient | 0.00005311 tCO2e per kBtu (1 therm = 100 kBtu) |
| Electricity coefficient, 2024-2029 | 0.000288962 tCO2e per kWh |
| Electricity coefficient, 2030-2034 | 0.000145 tCO2e per kWh |
| Emissions limit, 2024-2029 (multifamily) | 0.00675 tCO2e per sq ft |
| Emissions limit, 2030-2034 (multifamily) | 0.003346640 tCO2e per sq ft |
| Emissions limit, 2024-2029 (parking) | 0.00426 tCO2e per sq ft |
| Emissions limit, 2030-2034 (parking) | 0.000214421 tCO2e per sq ft |
| Penalty rate | $268 per tCO2e over the limit, per year |
| Formula | Limit = (multifamily sq ft x multifamily limit) + (parking sq ft x parking limit); Penalty = max(0, emissions - limit) x $268 |
Scope: multifamily buildings, with or without a parking area. Buildings with other occupancy types use different emissions limits for each part of the building, and this calculator does not cover them.
Estimate only - multifamily buildings; verify with your RDP before filing.