6.2 Optimize Energy Performance

Why This Credit Dominates the Scorecard

EA Credit: Optimize Energy Performance is worth up to 18 points, the largest single credit available on the LEED v4/v4.1 BD+C scorecard. A project that maxes out this one credit has already earned more than 16% of the points needed for certification.

Quick Answer: Optimize Energy Performance rewards projects 1–18 points based on the percentage improvement in energy cost of the proposed design versus the ASHRAE 90.1-2016 Appendix G baseline, calculated using the Performance Rating Method.

The Three Compliance Paths

Option 1: Whole-Building Energy Simulation (most common)

The project team builds a calibrated energy model of the proposed design and a separate baseline model that follows the rules in ASHRAE 90.1-2016 Appendix G, including:

• Baseline HVAC system type assigned by Table G3.1.1-1 based on building type and floor area
• Baseline envelope assemblies set by Section 5 prescriptive values for the climate zone
• Baseline lighting set to the Section 9 allowed Lighting Power Density (LPD)
• Baseline service water heating set to the Section 7 minimum equipment efficiency
• Identical geometry, occupancy schedules, process loads, and weather data in both models

The metric reported is proposed energy cost / baseline energy cost. The savings percentage drives the point award.

Option 2: ASHRAE 90.1-2016 Prescriptive Compliance

A project can earn up to 6 points by exceeding the prescriptive envelope, lighting, and HVAC requirements of ASHRAE 90.1-2016 by tabulated margins, without performing a full simulation. This is attractive for small, simple buildings where modeling cost is hard to justify.

Option 3: Advanced Buildings Core Performance Guide

Projects under 100,000 ft² that are not healthcare, warehouse, or laboratory may comply with Sections 1, 2, and 3 of the Advanced Buildings Core Performance Guide for up to 6 points.

The v4.1 Sliding-Scale Point Table

LEED v4.1 publishes a streamlined point ladder for Option 1. The exact thresholds vary slightly by rating system, but the New Construction table is representative:

Remember the prerequisite floor (5% NC) consumes the first interval; the credit starts awarding points once you exceed the floor by enough to land on the 6% row.

Energy Cost vs. Energy Use — Why It Matters

LEED measures energy cost, not site energy (kBtu) or source energy. The reasoning:

• Fuel switching is rewarded. Replacing electric resistance heat with high-efficiency natural gas can reduce cost even if site Btu doesn't change much.
• Time-of-use rates are captured. Shifting load off peak through controls or storage lowers cost without lowering kWh.
• On-site renewables offset purchased energy at the utility rate, which is how PV systems can earn EA credit even when they don't reduce site demand.

Exam Tip: When a question gives you both kBtu/ft²/yr and dollars, the LEED metric is dollars. Choose the cost answer.

How Renewables Interact With This Credit

On-site renewable energy production (solar PV, wind, geothermal, eligible biofuels) directly reduces the proposed building's purchased energy, which lowers proposed cost in the model and earns Optimize Energy Performance points. The standalone Renewable Energy credit (covered in 6.5) then rewards the percentage of total annual energy supplied by renewables — effectively a second point pathway for the same physical system.

Common Modeling Pitfalls That Cost Points

• Forgetting that process loads must be modeled identically in baseline and proposed unless documented as a LEED scope reduction.
• Failing to model unconditioned spaces (they are included in Appendix G runs with appropriate space types).
• Using utility virtual rates instead of the actual published rate schedule.
• Modeling the proposed building's actual HVAC system as the baseline (the baseline system type is dictated by Appendix G Table G3.1.1-1, not by what you are proposing).
• Not rotating the baseline through four orientations — Appendix G requires the baseline to be modeled at 0°, 90°, 180°, and 270° and averaged, while the proposed design is modeled in its actual orientation. Skipping rotation skews savings up.

Documentation the CxA and Reviewer Will Demand

LEED Online submittals for this credit include:

• A Performance Rating Method narrative describing every modeling input that differs between baseline and proposed.
• Baseline and proposed model outputs at the end-use level (heating, cooling, fans, pumps, lighting, plug loads, SHW).
• A utility rate schedule showing the same rates applied to both models.
• The calibrated weather file (TMY3 or equivalent).
• A process load schedule with operating hours.

Missing any of these is the most common cause of a Preliminary Review denial on this credit. Build the documentation as you build the model, not at the end.

Exam Strategy for This Credit

The exam loves cause-and-effect questions on Optimize Energy Performance: change one input, identify the savings impact. Memorize the 5% prerequisite floor for NC, the 6% threshold for the first credit point, the 50% threshold for 18 points, and the cost (not Btu) metric. When a scenario combines on-site PV with a building model, remember that PV cuts purchased energy cost — it shows up in this credit and in EA Credit: Renewable Energy.