ENERGY STAR Score, Tenant Data, and a Reluctant Owner
A 250,000 ft² mixed-use building (60% office, 40% retail) in a mild climate is pursuing LEED O+M v4.1 recertification. The whole-building ENERGY STAR score is 61, but only 3 of 8 tenants provide sub-metered electricity data; the rest are on landlord accounts. The building has a 15-year-old chiller, no retro-commissioning in six years, and no ASHRAE Level II audit. A local benchmarking ordinance requires annual whole-building data, and the utility’s aggregate data portal has 12 months of whole-building electricity but only 9 months of natural gas because a meter was replaced. The owner wants to claim energy performance credit and avoid a costly audit. The property manager argues that the score is “close enough” and that tenant sub-metering is unnecessary because the landlord pays most utility bills.
1. What energy data must be resolved before the project can rely on the ENERGY STAR score or claim energy performance credit?
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A score of 61 is not “close enough” for the score-based energy performance path, which generally requires a score of 75 or higher for eligible building types. More fundamentally, the score is not valid with only 9 months of natural gas data. The team must reconstruct a complete 12-month period for all energy sources, including the replacement meter’s reads and any estimated bills, and confirm that the building type and space use inputs match actual conditions. Tenant sub-metering is not automatically required for a whole-building score, but the landlord accounts plus tenant data must reconcile to the whole-building total. If the project wants to use an alternative performance path rather than the score, it still needs complete whole-building energy data and an approved baseline. The benchmarking ordinance data can help, but only if it covers all fuels and the same period.
2. What role should an ASHRAE Level II audit and retro-commissioning play, and what would you prioritize?
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The audit and retro-commissioning are not paperwork substitutes for missing data; they are the practical route to improve performance and support an ongoing commissioning program. I would first resolve the data gaps and normalize the 12-month baseline, then use a Level II audit to break down end-use consumption and identify no- and low-cost measures. Priority should go to the central plant and controls: chiller sequencing, supply-air-temperature reset, economizer operation, schedule optimization, and tenant after-hours HVAC. Retro-commissioning should verify that existing systems operate as intended before capital replacement is considered. If the owner is avoiding an audit, explain that the rating system’s commissioning prerequisite and the credit documentation both depend on documented investigation and analysis, and that a score of 61 is unlikely to reach 75 without measured savings.
3. How should the team treat the tenants that do not share sub-metered data?
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The team should not drop those tenants from the boundary or assume zero consumption. The landlord accounts already include some tenant electricity, and the missing data may affect allocation and savings estimates, but whole-building performance can still be calculated if all landlord and tenant accounts are aggregated. For tenants on separate accounts, request data-release authorization or use a utility aggregate that covers the whole building. If a tenant refuses, document the attempt and use the best available whole-building data, such as the benchmarking ordinance portal or landlord master-meter data. Submetering should be presented as a management and tenant-engagement tool, not as a prerequisite waiver. The owner should also correct the property manager’s assumption that “the landlord pays most bills” makes tenant data irrelevant: whole-building performance includes tenant consumption.