EAc1 is the credit teams assume they have already earned. The building is all-electric, so the points feel automatic. Then the combined weighted-average COP comes in under 1.8, and the five-point option is off the table. It is not a wipeout, because a second option still pays 1 to 4 points. But the assumption that all-electric equals five points is where the estimate goes wrong.

This is a reference for how the credit is actually structured in BD+C v5, and where an all-electric design still misses.

What the credit is worth

  • New Construction: 1 to 5 points. 5 points are required for New Construction Platinum.
  • Core and Shell: 1 to 4 points. 4 points are required for Core and Shell Platinum.

The Platinum line is worth reading precisely. For New Construction, the fifth point comes only from Option 1, and Option 1 means no on-site combustion except emergency support. So an NC Platinum target does effectively require a combustion-free building. Core and Shell is looser: its four points can be assembled from paths that still allow cold-weather combustion, plus a readiness point, so CS Platinum does not force the same all-electric outcome.

The intent is narrow and worth stating plainly: reward buildings designed not to burn fuel on-site, for cleaner air now and lower-carbon operation as the grid decarbonizes. That last clause is the tie to renewable energy. Electrifying the loads is what lets renewable supply actually decarbonize them, so EAc1 and EAc4 are the two halves of the same v5 decarbonization story.

Two options, and only one is combustion-free

New Construction offers two routes, and the difference between them is the whole credit.

Option 1, No On-Site Combustion (5 points). Design and operate the project with no on-site combustion except for emergency support systems. That is the only combustion exception in Option 1. A standby generator is fine. A gas backup boiler is not, even if it only fires in a cold snap.

Option 2, No On-Site Combustion Except at Low Temperatures (1 to 4 points). This is the path that permits cold-weather combustion, and its name is literal. The low-temperature allowance lives here, not in Option 1. Low temperature is defined precisely as outside-air dry-bulb below 20 F (-6.5 C). Choosing this route caps the credit at 4 points.

That distinction is the most common misread. The credit does let a building keep a low-temperature combustion backup, but only through Option 2, at a lower ceiling. It is not a carve-out hidden inside the five-point option.

Two rules apply to both options:

  • A fuel cell running on fossil fuel is ineligible. Whether anything is technically combusted is not the test. Not using fossil fuel is.
  • District energy projects must meet the credit at the district facility, or follow USGBC's additional guidance for interpreting the requirement. On-site equipment is not the whole picture when the heat comes from a shared plant.

The gate that actually decides it: 1.8 COP

Removing combustion is the entry ticket. The points hang on efficiency. For the five-point Option 1, the combined weighted-average efficiency of space heating and service water heating must be at least 1.8 COP. Install heat pumps, run the weighted average, and if it lands at 1.6 the option is not met.

COP is measured one of two ways:

  • Rated conditions. For equipment with multiple rated conditions, use the rating closest to 17 F outside-air dry-bulb, 32 F entering liquid, or 44 F heating-source leaving liquid, whichever condition applies to the equipment.
  • Annual average COP from an energy simulation.

Which method helps depends on the equipment and the project. The rated-conditions path is a single number a design team can commit to early. The simulation path reflects how the equipment actually runs across the year.

What the COP calculation lets you drop

The weighted average is not taken over every piece of equipment. Three exclusions matter, because they move the average:

  • Space-heating equipment in climate zones 0 to 2.
  • Supplemental or auxiliary heating designed only for low-temperature operation.
  • Service water heating in nonresidential spaces meeting the ASHRAE 90.1-2022 point-of-use criteria (Section 11.5.2.3.3, W05), without exceptions.

The zone 0 to 2 exclusion is the one people miss. A warm-climate project can carry a modest amount of resistance heat and still clear 1.8, because that equipment sits outside the calculation.

Option 2, one path at a time

Option 2 is worth 1 to 4 points, assembled from three independent paths. Each path lets the building keep low-temperature combustion for that load:

  • Path 1, Space Heating (2 points). Space heating operates without on-site combustion except at low temperatures. In climate zones 3 and above, weighted-average space-heating efficiency must reach 1.8 COP. In zones 0 to 2 there is no COP requirement on this path.
  • Path 2, Service Water Heating (1 point). SWH operates without combustion except at low temperatures. If total SWH capacity exceeds 34,000 Btu/hr (10 kW), it must hit 1.8 COP or a domestic-hot-water solar fraction of at least 0.4. Below that capacity, this path sets no efficiency floor.
  • Path 3, Cooking and Other Process Loads (1 point). Cooking, laundry, process equipment, and on-site power generation are designed to run without combustion. A building that simply does not have these systems earns the point automatically.

The paths stack, capped at 4. Because Option 2 keeps some combustion, it cannot reach the fifth point.

Core and Shell is scored differently

Core and Shell tops out at 4 points and is built around the fact that the developer does not control tenant equipment.

  • Option 1, Electrification (2 to 4 points).
    • Path 1, No On-Site Combustion: 1.8 COP for 4 points, 1.3 COP for 3 points. Note the second, lower rung that New Construction does not offer.
    • Path 2, No On-Site Combustion Except at Low Temperatures (1 to 3 points): a Space Heating case (1.8 COP for 2, 1.3 COP for 1) plus a Service Water Heating case (1 point).
    • Path 3, No On-Site Combustion, Limited Scope (1 to 2 points): meet 1.8 COP over the systems in scope. One qualifying system earns 1 point. Covering at least 30% of the project's peak combined heating and SWH load earns 2.
  • Option 2, Electrification Readiness (1 point). Build the capability without installing the equipment. This is real infrastructure, not a memo: dedicated physical space for future heat-pump equipment, chase ways for refrigerant and condensate, junction-box and dedicated electrical-panel space for the future branch circuit, and accommodation for energy-recovery ventilation where ventilation is left to the tenant. It is documented in the project plans and the tenant guidelines.

One Core and Shell rule quietly moves the numbers, and it is scoped to Option 1 Paths 1 and 2. All heating and SWH systems needed for the total building load go into the weighted average, and any future system is carried at a punishing 1.0 COP. Future equipment can be dropped from the calculation and treated as compliant only when the building code, or the construction drawings for a project with tenancy, confirms a weighted average of at least 1.8 COP.

Electrification is scored on how the building is designed to operate, not on a single nameplate. The weighted average, the exclusions, and the two options are where the points are actually won or lost.

What trips people up

  • Assuming all-electric equals the credit. Removing combustion is necessary. The 1.8 COP weighted average is what earns the points.
  • Putting the low-temperature combustion allowance in the five-point option. It belongs to Option 2. Option 1's only combustion exception is emergency support.
  • Averaging COP over every unit. Zone 0 to 2 space heating, low-temp supplemental heat, and qualifying point-of-use SWH come out of the calculation.
  • Carrying a New Construction COP rung into Core and Shell. CS adds a 1.3 COP rung, and its Option 1 Paths 1 and 2 default future equipment to 1.0 COP.
  • Forgetting the fuel-cell rule. A fossil-fueled fuel cell is ineligible, even though it is not combustion in the usual sense.
  • Underestimating one gas load. A gas kitchen rules out Option 1 entirely and forfeits Path 3, so the realistic ceiling drops to 3 of 5. Not fatal to the credit, but a two-point swing, not one.

Source: LEED v5 BD+C Rating System, July 2026 Edition, EAc1 Electrification at pages 86 to 91 (the same credit sat at pages 85 to 90 in the February 2026 edition). Efficiency references follow ASHRAE 90.1-2022. Rating systems get addenda, so confirm the current text before you submit anything on the strength of a blog post.

Electrification (EAc1) and renewable energy (EAc4) are the two levers behind a v5 decarbonization target. The free VERTIQ feasibility check estimates where a specific project lands across BD+C v4, v4.1, and v5, ID+C v4, v4.1, and v5, and O+M v5: https://vertiq.net/feasibility