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Carbon Tax Exposure Calculator
Carbon taxation creating new operating cost for emissions-intensive buildings.
Total exposure
$67,000
Annual exposure
$13,400
Excess emissions
50
How the math works
Excess emissions = emissions − limit. Annual exposure = excess × penalty.
450 − 400 = 50 tCO2e excess × $268 = $13,400/yr × 5 = $67,000 total carbon exposure.
How to Use
- Enter building emissions tCO2e/year.
- Enter emissions limit.
- Enter penalty per tCO2e over.
- Enter years of exposure.
- Read total exposure.
Frequently Asked Questions
Emissions sources?
Electricity: 0.4-0.9 kg CO2/kWh (grid mix). Natural gas: 2.0 kg CO2/therm. District steam: 0.1-0.3 kg CO2/MMBtu. Fuel oil: 10 kg CO2/gallon. Each building maintains tracker of all sources.
Emission limits?
NYC LL97: 2024 limit ~4.53 kg CO2e/SF. 2030 limit: 3.43 kg. 2035 limit: 2.73. Declining thresholds over time. Benchmark buildings to understand position. Above limit triggers $268/tonne penalty.
Mitigation options?
Energy efficiency upgrades (LEDs, HVAC, envelope). Electrify from gas to electric. Renewable energy credits (RECs). On-site solar. Carbon offsets (limited recognition). Each reduces emissions differently.
How often should I rerun this?
Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.
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