Three pillars of the BERDO heat recovery pathwaymechanics, math, engagement
The pathway has three parts. The regulatory mechanics establish how covered buildings report and what they pay if they exceed the cap. The displacement math converts a MicroLink thermal export into a host emissions reduction. The engagement programme advances heat recovery as a recognised methodology with the Review Board and the working groups it convenes.
Covered buildings 35,000 sq ft [3,250 m²] and larger are subject to declining emissions caps starting calendar year 2025, with first reports due August 15, 2026. The cap is set by use type. The ACP for buildings above the cap is $234 per metric ton CO2e.
BERDO 2.0 covers approximately 6,000 buildings, roughly 5 percent of Boston buildings, representing nearly 40 percent of citywide emissions. Reporting flows through ENERGY STAR Portfolio Manager plus a supplemental BERDO Reporting Form. Third party verification is required in the first emissions compliance year and every five years thereafter.
Flexibility measures include Building Portfolios for single owner multi building accounts, Individual Compliance Schedules with custom baseline years, and Hardship Compliance Plans for historic, affordable housing, pre-existing contract, or financial hardship cases. The Equitable Emissions Investment Fund is seeded with $3.5 million from City operating funds and replenished from ACPs and fines.
Smaller covered buildings (20,000 to 35,000 sq ft, 15 to 34 units) become subject in 2030 with first reports due 2031. The 2030 step also brings the first major cap tightening for the larger covered buildings already in scope.
- 2025 to 2029 first binding period
- 2030 to 2034 ~40 to 50% cap reduction across use types
- 2035, 2040, 2045 successive verification and tightening
- 2050 net zero for all covered buildings
Every MMBtu of natural gas the host avoids firing comes off the host's reported emissions at the natural gas emissions factor of approximately 53 kg CO2e per MMBtu. The host reports reduced gas consumption, and the reduction is real on the BERDO formula.
The displacement formula is Emissions = Fuel Use × Emissions Factor. A 5 MW continuous thermal export over 8,760 hours, displacing natural gas at 80 percent boiler efficiency, removes approximately 7,200 metric tons CO2e per year from the host's reported emissions. At the $234 per ton ACP, the avoided compliance exposure is approximately $1.685 million per year at the host.
For a 50 kW thermal export under the same assumptions, the annual displacement is approximately 72 metric tons CO2e, equivalent to roughly $17,000 per year in avoided ACP. The relationship scales linearly with thermal capacity and load factor.
Behind the meter solar generation receives an emissions factor of zero. On-site cogeneration is counted at input fuel times its emissions factor, with allocation across thermal and electric streams permitted under the District Energy System formula.
- 100,000 sq ft lab at 2030 cap exceeds by ~790 t CO2e/yr = ~$184,860/yr ACP
- 5 MW thermal export displaces ~7,200 t CO2e/yr = ~$1.685M/yr avoided
- 50 kW thermal export displaces ~72 t CO2e/yr = ~$17,000/yr avoided
- Threshold for priority pilot host BERDO exposure over $200,000/yr
Heat recovery is not explicitly named in BERDO Policies and Procedures Version 3. The Review Board retains discretion under Section 9.A.a.ii.4 to accept alternative emissions factors. That section is the operative vehicle for formal recognition of heat recovery as a discrete pathway.
The Healthcare Institutions Connected to District Energy Systems Working Group is mandated by Policies and Procedures Section 11.D. This is the natural forum for advancing the heat recovery methodology with Review Board awareness. Hospital steam loops, hospital laundry, and university campus district energy all sit within this working group's scope.
The BERDO Commercial Real Estate Working Group, chaired by A Better City, is the parallel forum for commercial buildings. Both working groups feed methodology recommendations back to the nine member Review Board chaired by Jessica Boatright.
Recognised consultants under the Building Decarbonization Advisor Program (New Ecology, GreenerU, Jaros Baum and Bolles, Thornton Tomasetti) provide the technical engineering review the Review Board expects when novel methodologies are proposed.
- Healthcare District Energy Working Group seating via the Senior Policy Manager
- Section 9.A.a.ii.4 docket for alternative emissions factor methodology
- Commercial Real Estate Working Group presentation through A Better City
- BDAP consultant retained for engineering review
- Climate Action Plan 2026 to 2030 case study positioning