6.5 Renewable Energy and Carbon Offsets
Key Takeaways
- EA Credit: Renewable Energy is worth 1–5 points in LEED v4.1 and combines the former Renewable Energy Production and Green Power and Carbon Offsets credits into one tiered scale
- The credit awards points based on the percentage of the building's total annual energy supplied by a tiered mix of Tier 1 (on-site), Tier 2 (off-site Power Purchase Agreements with new generation), and Tier 3 (Renewable Energy Certificates / carbon offsets)
- Net-zero energy is a recognized pathway and can earn the maximum 5 points when on-site plus contracted off-site renewables equal or exceed 100% of annual energy use
- EA Credit: Enhanced Refrigerant Management is worth 1 point and rewards low-ODP and low-GWP refrigerants using the formula LCGWP + LCODP × 10⁵ ≤ 100 (LEED v4) / ≤ 13 (LEED v4.1)
- Compliance can also be achieved by using equipment with no refrigerants or with natural refrigerants such as ammonia (R-717), CO₂ (R-744), water (R-718), or hydrocarbons
Two Credits, One Mission: Lower Atmospheric Impact
EA Credit: Renewable Energy and EA Credit: Enhanced Refrigerant Management together address the climate-impact side of the EA category that the prerequisites only partially cover.
Quick Answer: Renewable Energy (1–5 pts) rewards the percentage of annual energy supplied by renewables in a tiered hierarchy (on-site > off-site PPA > RECs/offsets). Enhanced Refrigerant Management (1 pt) rewards low-ODP and low-GWP refrigerant choices using a life-cycle direct-impact formula.
EA Credit: Renewable Energy (1–5 points)
What Changed in LEED v4.1
LEED v4 had two separate credits: Renewable Energy Production (up to 3 pts for on-site generation) and Green Power and Carbon Offsets (up to 2 pts for off-site contracts). LEED v4.1 combined them into a single EA Credit: Renewable Energy with a tiered scale up to 5 points.
Tiered Renewable Sources
| Tier | Source | Why It Scores Highest |
|---|---|---|
| Tier 1 | On-site renewables (PV, wind, geothermal, eligible biofuels, solar thermal) | Direct displacement of purchased energy; verifiable |
| Tier 2 | Off-site renewables via Power Purchase Agreements (PPAs) with new generation, with bundled RECs | Adds new capacity to the grid |
| Tier 3 | Unbundled Renewable Energy Certificates (RECs) and certified carbon offsets | Lowest additionality; cheapest path |
Tiered Point Table (v4.1 simplified)
| % of Total Annual Energy from Renewables | Points (NC) |
|---|---|
| 5% | 1 |
| 10% | 2 |
| 15% | 3 |
| 20% | 4 |
| 50% | 5 |
| 100% (Net Zero) | 5 + recognition |
RECs and carbon offsets must be Green-e Energy certified or equivalent and have at least a five-year contract commitment.
Net-Zero Pathway
The credit explicitly recognizes the net-zero energy building — one whose on-site plus contracted off-site renewables equal or exceed total annual energy consumption. Net zero earns the full 5 points and unlocks recognition under the LEED Zero program.
How This Stacks With Optimize Energy Performance
On-site renewable generation reduces purchased energy in the Appendix G model, which raises the percent savings reported under Optimize Energy Performance. The same kWh of solar therefore contributes to both credits — a multiplier effect that makes PV one of the highest-leverage LEED investments.
EA Credit: Enhanced Refrigerant Management (1 point)
What It Adds Beyond the Prerequisite
The fundamental prerequisite addresses ozone depletion potential (ODP) only. The enhanced credit adds global warming potential (GWP) so that refrigerants are evaluated on both atmospheric impacts.
Three Compliance Paths
- No refrigerants at all — typical of natural-ventilation projects or small all-electric heat-source systems.
- Natural refrigerants with ODP = 0 and GWP ≤ 50:
- R-717 Ammonia (NH₃) — industrial chilled water plants
- R-744 Carbon Dioxide (CO₂) — transcritical refrigeration and heat pumps
- R-718 Water (H₂O) — absorption chillers, evaporative cooling
- R-290 Propane, R-600a Isobutane, other hydrocarbons — small refrigeration
- Refrigerant impact calculation — evaluate each refrigerant's life-cycle direct atmospheric impact using:
LCGWP + LCODP × 10⁵ ≤ 100 (LEED v4 NC)
LCGWP + LCODP × 10⁵ ≤ 13 (LEED v4.1 simplified threshold)
Where:
- LCGWP = life-cycle direct global warming potential (lb CO₂e/ton-yr) = GWPᵣ × [(Lr × Life + Mr) × Rc / Life]
- LCODP = life-cycle ozone depletion potential (lb CFC-11/ton-yr) = ODPᵣ × [(Lr × Life + Mr) × Rc / Life]
- Lr = annual refrigerant leakage rate (default 2%)
- Mr = end-of-life refrigerant loss (default 10%)
- Life = equipment lifetime (default 10 years for unitary, 20 years for chillers)
- Rc = refrigerant charge (lb of refrigerant per ton of cooling capacity)
Common Refrigerants on the Exam
| Refrigerant | ODP | GWP | Status |
|---|---|---|---|
| CFC-11 / CFC-12 | 1.0 / 1.0 | High | Prohibited (prerequisite) |
| HCFC-22 (R-22) | 0.04 | 1,810 | Phasing out globally |
| HFC R-134a | 0 | 1,430 | Common; usually fails enhanced threshold |
| HFC R-410A | 0 | 2,088 | Common; usually fails enhanced threshold |
| HFO R-1234yf, R-1234ze | 0 | < 10 | Passes |
| R-717 NH₃ | 0 | 0 | Natural; passes |
| R-744 CO₂ | 0 | 1 | Natural; passes |
A new LEED v4.1 BD+C: NC project supplies 12% of its total annual energy from on-site PV and an additional 8% from a 10-year off-site PPA with a new wind farm (bundled RECs). Approximately how many points should the team expect under EA Credit: Renewable Energy?
Which refrigerant choice would most directly help a project satisfy EA Credit: Enhanced Refrigerant Management?