What Is EUI? Oregon Building Owners Explained

Energy Use Intensity (EUI) is the single number that determines whether your Oregon commercial building passes or fails the state’s Building Performance Standard. It measures how much energy your building consumes per square foot per year, expressed in kBtu/sq ft/year. Under OAR 330-300, every Tier 1 building (35,000+ sq ft) must demonstrate it meets a target EUI for its building type — or show a credible plan to get there — before the 2028 deadline.

If you own or manage a covered Oregon commercial building and you don’t know your building’s current EUI, that’s the first problem to solve. Everything in BPS compliance flows from this number: whether you’re already compliant, how far you need to go, what improvements will move the needle, and what an ASHRAE Level 2 audit will recommend.

How EUI Is Calculated

The formula is straightforward:

EUI = Total annual energy consumption (kBtu) ÷ Gross floor area (sq ft)

Total energy consumption includes all fuel sources: electricity, natural gas, district steam, fuel oil, propane — everything that goes into operating the building over a full calendar year. You convert each fuel type to kBtu (thousand British thermal units) using standard conversion factors, add them together, and divide by gross floor area.

Example: A 50,000 sq ft Portland office building consumes 4,200,000 kWh of electricity and 18,000 therms of natural gas in a year.

• Electricity: 4,200,000 kWh × 3.412 kBtu/kWh = 14,330,400 kBtu
• Natural gas: 18,000 therms × 100 kBtu/therm = 1,800,000 kBtu
• Total: 16,130,400 kBtu
• EUI: 16,130,400 ÷ 50,000 = 322.6 kBtu/sq ft/year

That number is then entered into ENERGY STAR Portfolio Manager, which is the reporting tool both Oregon BPS and Portland’s Energy Performance Reporting requirement use. Portfolio Manager calculates a weather-normalized EUI (site EUI) and a source EUI that accounts for the energy used to generate and deliver the fuel to your building.

Oregon BPS uses site EUI — the energy actually consumed at the building — for compliance purposes.

Oregon BPS EUI Targets by Building Type

ODOE sets target EUIs for each major commercial building category. Buildings must either meet the target or implement the measures identified in an ASHRAE Level 2 audit that demonstrate a credible path to compliance. The targets below reflect current Oregon BPS guidance:

Building Type	Target EUI (kBtu/sq ft/yr)	Typical Range for Oregon Buildings
Office (general)	55–75	65–120
Retail / strip mall	60–80	70–130
Hotel / motel	100–130	110–180
K–12 school	45–65	50–100
University / college	80–120	90–160
Hospital / healthcare	200–280	220–380
Warehouse / distribution	25–40	30–70
Mixed-use (office-dominant)	60–85	70–130
Government / municipal office	55–75	65–115

These targets exist because different building types have fundamentally different energy profiles. A hospital runs 24/7 life-safety equipment and cannot be directly compared to a warehouse that’s dark half the week. The EUI target normalizes for building type and allows ODOE to assess whether a specific building is performing reasonably well for what it is — or whether it’s wasting energy relative to comparable buildings.

If your current EUI is above the target range for your building type, you are likely a non-compliant building under Oregon BPS. If you’re within the target range, you may already be in a compliance position — but you still need the ASHRAE Level 2 audit documentation to formally demonstrate it to ODOE.

Site EUI vs. Source EUI: Which One Matters for Oregon BPS?

ENERGY STAR Portfolio Manager calculates two EUI numbers, and confusing them is one of the most common mistakes building owners make when first benchmarking.

Site EUI measures energy consumed at the building itself — your utility meter reads, converted to kBtu. This is the number Oregon BPS uses.

Source EUI accounts for the full energy chain — including the energy lost generating and transmitting electricity from the power plant to your building. Source EUI is typically 2–3× higher than site EUI for buildings that use significant electricity, because the U.S. grid loses roughly two-thirds of the energy in fossil fuels before a kWh reaches your meter.

For Oregon BPS compliance reporting to ODOE, always reference your site EUI. Source EUI is useful context for understanding your total environmental impact, but it is not the compliance metric.

Weather Normalization: Why Your EUI Adjusts Year to Year

Raw EUI numbers fluctuate based on weather. A Portland office building in a cold winter burns more gas for heating than the same building in a mild winter — not because it got less efficient, but because it was colder. ENERGY STAR Portfolio Manager applies a weather normalization adjustment using degree-day data from the nearest weather station to produce a weather-normalized EUI.

For Oregon buildings, weather normalization matters more in the interior and at elevation. A Bend hotel, a Klamath Falls office building, or a building in the Willamette Valley all sit in different climate zones with different heating and cooling loads. Portfolio Manager accounts for this, which means your weather-normalized EUI is a more accurate reflection of your building’s actual energy efficiency than the raw consumption number.

ODOE uses weather-normalized data for BPS compliance assessments. When your auditor benchmarks your building, they’ll confirm that your Portfolio Manager data is weather-normalized before accepting it as the EUI baseline.

Why EUI Alone Doesn’t Tell the Whole Story

EUI is necessary but not sufficient for BPS compliance. It tells you where you are — it doesn’t tell you how to get where you need to go. That’s what the ASHRAE Level 2 audit adds.

A building with a high EUI (say, 145 kBtu/sq ft/yr for an office that should be under 75) needs to understand why that number is high before it can chart a compliance path. Common contributors:

• HVAC systems running outside occupied hours — the single largest driver of excess EUI in Oregon office buildings. Pneumatic controls, outdated BAS systems, and tenant behavior combine to run equipment through the night.
• Outdated lighting — T8 fluorescent fixtures in a large retail or warehouse building can represent 25–35% of total electricity consumption. LED conversion with occupancy controls typically moves EUI 10–20 kBtu/sq ft/yr.
• Envelope air leakage — particularly in Oregon coastal buildings where wind-driven infiltration drives both heating and cooling loads.
• Domestic hot water — high in hospitality, healthcare, and multifamily-adjacent commercial buildings. Often overlooked because the utility cost is modest, but the EUI contribution is real.
• Plug load density — data centers, restaurant equipment, laundry facilities. Each specialized use within a building inflates the overall EUI and complicates the benchmark.

An ASHRAE Level 2 audit systematically identifies which of these factors apply to your specific building, quantifies each one’s contribution to the total EUI, and prioritizes the improvements that move the needle most efficiently — in terms of both energy savings and cost per kBtu/sq ft reduction.

How to Find Your Building’s Current EUI

If your building is in Portland and you’ve been complying with Portland’s Energy Performance Reporting requirement (PEPR), you likely already have 4–7 years of utility data in ENERGY STAR Portfolio Manager. Pull up your account, navigate to your property, and check the current site EUI on the Summary tab. That number is your starting point.

If you’re outside Portland, or if you haven’t been using Portfolio Manager, you’ll need to:

1. Gather 12 months of utility data for all fuel types (electricity, gas, steam, etc.). Pull bills directly or contact PGE, Pacific Power, or EWEB for interval data.
2. Create an ENERGY STAR Portfolio Manager account at energystar.gov/buildings/benchmark. It’s free.
3. Enter your building profile — gross floor area, building type, construction year, occupancy hours, number of workers.
4. Enter utility meter data — either manually or by linking directly to your utility account (PGE and Pacific Power both support automated data sharing through Portfolio Manager).
5. Review your site EUI on the Summary page. Compare it to the target range for your building type.

The whole setup process takes 2–4 hours for a single-tenant building with straightforward utility accounts. Multi-tenant buildings with shared meters, sub-metering, or green power arrangements take longer and sometimes require utility data corrections.

What Happens After You Know Your EUI

Three scenarios, based on where your number lands:

Your EUI is already within the target range. You’re potentially in a compliance position, but you still need a formal ASHRAE Level 2 audit to document it. ODOE doesn’t accept self-reported EUI claims as compliance — the audit provides the third-party verification and the professional certification that your benchmarking methodology is correct. The audit is faster and less expensive when your EUI is already good, because the auditor spends less time on energy modeling and more time confirming existing documentation.

Your EUI is moderately above target (10–30% over). This is the most common situation for Oregon Tier 1 buildings. An ASHRAE Level 2 audit will identify specific Energy Conservation Measures (ECMs) with capital costs and projected EUI reductions. For most buildings in this category, 2–4 targeted improvements — typically HVAC controls, lighting, and envelope — are enough to reach the target EUI by 2028. With 22 months left, there’s enough time to implement recommendations if you start the audit process now.

Your EUI is significantly above target (30%+ over). You need an audit immediately. Not because the situation is hopeless — buildings with very high EUI actually have the most improvement potential per dollar spent — but because the audit timeline (8–14 weeks) plus implementation scheduling means you are already inside the window where delays become compliance risk. Energy Trust of Oregon may help offset audit costs, which reduces out-of-pocket audit expense significantly.

The EUI Trajectory Compliance Pathway

Oregon BPS allows a third option beyond “meet the target” and “implement recommendations”: demonstrate an improvement trajectory. If your building has been reducing EUI year over year at a documented rate consistent with reaching the target by 2028, ODOE may accept that trajectory as evidence of compliance.

This pathway matters most for buildings that started BPS preparation early and have multi-year Portfolio Manager data showing consistent improvement. It rewards proactive benchmarking — which is one reason Portland buildings with years of PEPR reporting data are often better positioned for BPS compliance than similar buildings in other Oregon cities. Their historical EUI trend is already documented.

For buildings that are just starting the benchmarking process in 2026, the improvement trajectory pathway is not available — there’s no historical data to show. The direct compliance pathways (meeting the target EUI or implementing the audit’s recommended ECMs) apply.

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Your building’s EUI is the number everything else in Oregon BPS compliance is built on. If you don’t know it yet, that’s the first thing to establish. If you know it and it’s above target, the next step is an ASHRAE Level 2 audit that tells you exactly which improvements close the gap.

We provide flat-fee ASHRAE Level 2 compliance audits that include full EUI benchmarking in ENERGY STAR Portfolio Manager, gap analysis against your building type’s BPS target, and a prioritized ECM roadmap with implementation costs and projected EUI reductions. No hourly billing, no scope creep.

Schedule your compliance audit — 22 months to the 2028 deadline, and audit scheduling is filling now.

For buildings that already have their EUI benchmarked and need year-over-year tracking and annual ODOE submissions handled, our annual BPS benchmarking service covers Portfolio Manager maintenance, utility data updates, ODOE reporting, and compliance monitoring. Set up annual benchmarking and take the ongoing compliance workload off your plate.