Onahan
K-12 School in Chicago, IL · 6634 W Raven St · 60631
At a glance
Onahan is a 90,969-square-foot K-12 school at 6634 W Raven St in Chicago, Illinois, built in 1928. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 54 out of 100 (grade D), a site energy-use intensity of 64.1 kBtu/ft² and 478 tCO₂e of greenhouse-gas emissions. That score is higher than 63% of the 365 scored K-12 school buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 54 (band D) |
| Site EUI | 64.1 kBtu/ft² |
| Source EUI | 104.6 kBtu/ft² |
| GHG emissions | 478 tCO₂e |
| GHG intensity | 5.3 kgCO₂e/ft² |
| Electricity | 568,064 kWh |
| Natural gas | 38,970 therms |
| Gross floor area | 90,969 sq ft |
| Source record | chicago:251473:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 54 | +17 | 64.1 kBtu/ft² | 478 tCO₂e |
| 2022 | 37 | +7 | 86.2 kBtu/ft² | 597 tCO₂e |
| 2021 | 30 | -26 | 90.0 kBtu/ft² | 649 tCO₂e |
| 2020 | 56 | 73.5 kBtu/ft² | 527 tCO₂e | |
| 2019 | — | — | — | |
| 2018 | 25 | -14 | 97.4 kBtu/ft² | 709 tCO₂e |
| 2017 | 39 | +7 | 82.6 kBtu/ft² | 672 tCO₂e |
| 2016 | 32 | -5 | 92.6 kBtu/ft² | 723 tCO₂e |
| 2015 | 37 | 96.5 kBtu/ft² | 696 tCO₂e |
Compliance context
Building Energy Use Benchmarking Ordinance
Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 6634 W Raven St
- City
- Chicago
- State
- Illinois
- ZIP
- 60631
- Coordinates
- 41.82733, -87.61994
Within ~1 km
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See also: most efficient in Chicago · biggest emitters
How does Onahan compare with other K-12 school buildings in Chicago?
The latest disclosures cover 543 K-12 school buildings in Chicago, out of 3,852 buildings citywide. Onahan's ENERGY STAR score of 54 compares with an average of 45 across the 365 that report a score; it scores higher than 63% of them and lower than 36%. Its site EUI of 64.1 kBtu/ft² is about 12% below the average of 72.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 5.3 kgCO₂e/ft² is about 15% below the group average of 6.2 kgCO₂e/ft².
At 90,969 sq ft, it is about 25% below the average floor area of 121,824 sq ft for those buildings. It was built in 1928, 15 years earlier than the group's average year built (1943). Across all 24 jurisdictions BuildingCensus covers, the 6,548 K-12 school buildings average an ENERGY STAR score of 64 and a site EUI of 52.7 kBtu/ft².
How has Onahan's energy performance changed over time?
BuildingCensus holds 9 Chicago disclosures for Onahan, covering report years 2015–2023. Its ENERGY STAR score went from 37 in 2015 to 54 in 2023 (+17 points); its best year on file was 2020, at 56. Site EUI moved from 96.5 kBtu/ft² (2015) to 64.1 kBtu/ft² (2023), a 34% decrease. Reported emissions went from 696 tCO₂e to 478 tCO₂e over the same span (down 31%).
What does an ENERGY STAR score of 54 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 54 means the building performs better than about 54% of its national peers. BuildingCensus bands the score into report-card grades; 54 falls in band D — lowest band (1–54). It sits 21 points below 75, the threshold for ENERGY STAR certification. In Chicago, 35% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Onahan's 64.1 kBtu/ft² across 90,969 sq ft works out to about 5.8 billion Btu (1,709 MWh-equivalent) in 2023. Its source EUI of 104.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 568,064 kWh of electricity and 38,970 therms of natural gas for the year.
Which law requires Onahan to report its energy use?
Onahan reports under the Building Energy Use Benchmarking Ordinance, the legal basis of the Chicago Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record chicago:251473:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
More K-12 school buildings in Chicago
- McAuliffe· 90,799 sq ft · score 25 (D)
- Noble Network of Charter Schools· 90,742 sq ft · score 4 (D)
- Columbia Explorers· 90,500 sq ft · score 19 (D)
- Ogden ES Branch @ Jenner· 90,164 sq ft · score 44 (D)
- Henry· 90,100 sq ft · score 83 (B)
- Dawes· 90,061 sq ft · score 37 (D)
- K-12 School buildings in Chicago· 543 benchmarked
- All Chicago benchmarked buildings· Building Energy Use Benchmarking Ordinance
- Most efficient large buildings in Chicago
- Least efficient large buildings in Chicago
- Biggest emitters in Chicago
Frequently asked questions
What is Onahan's energy grade?
Onahan scores 54 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Onahan use?
Its 2023 site energy-use intensity was 64.1 kBtu/ft² (104.6 kBtu/ft² source) across 90,969 sq ft, including 568,064 kWh of electricity and 38,970 therms of natural gas.
What are Onahan's carbon emissions?
Onahan reported 478 tCO₂e of greenhouse-gas emissions (5.3 kgCO₂e/ft²) for 2023.
Where is Onahan?
Onahan is at 6634 W Raven St, in Chicago, Illinois 60631. Its coordinates are 41.82733, -87.61994 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Onahan and when was it built?
Onahan has 90,969 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1928 as its year built. It is classed as K-12 school.
Is Onahan covered by the Building Energy Use Benchmarking Ordinance?
Yes — it appears in the 2023 Chicago Energy Benchmarking disclosure, which lists the buildings reporting under the Building Energy Use Benchmarking Ordinance.
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About this data
Source: Chicago Energy Benchmarking (Building Energy Use Benchmarking Ordinance), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Onahan, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/onahan-242e8046 (data as of October 2, 2026).