Ariel / U of C NKO
K-12 School in Chicago, IL · 1119 E 46th St · 60653
At a glance
Ariel / U of C NKO is a 147,109-square-foot K-12 school at 1119 E 46th St in Chicago, Illinois, built in 1893. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 22 out of 100 (grade D), a site energy-use intensity of 87.9 kBtu/ft² and 1,067 tCO₂e of greenhouse-gas emissions. That score is higher than 21% 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 | 22 (band D) |
| Site EUI | 87.9 kBtu/ft² |
| Source EUI | 144.4 kBtu/ft² |
| GHG emissions | 1,067 tCO₂e |
| GHG intensity | 7.3 kgCO₂e/ft² |
| Electricity | 1,282,555 kWh |
| Natural gas | 85,566 therms |
| Gross floor area | 147,109 sq ft |
| Source record | chicago:251574:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 22 | -5 | 87.9 kBtu/ft² | 1,067 tCO₂e |
| 2022 | 27 | +10 | 92.3 kBtu/ft² | 1,093 tCO₂e |
| 2021 | 17 | -15 | 101.6 kBtu/ft² | 1,240 tCO₂e |
| 2020 | 32 | 84.2 kBtu/ft² | 1,087 tCO₂e | |
| 2019 | — | — | — | |
| 2018 | 34 | +3 | 100.1 kBtu/ft² | 1,283 tCO₂e |
| 2017 | 31 | +2 | 96.6 kBtu/ft² | 1,345 tCO₂e |
| 2016 | 29 | -15 | 95.8 kBtu/ft² | 1,397 tCO₂e |
| 2015 | 44 | 82.3 kBtu/ft² | 1,275 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
- 1119 E 46th St
- City
- Chicago
- State
- Illinois
- ZIP
- 60653
- Coordinates
- 41.84699, -87.67556
Within ~1 km
Nearby benchmarked buildings
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- Nightingalescore 10
K-12 School · 140,838 sq ft
- LZ Productsscore 92
Wholesale Club/Supercenter · 72,000 sq ft
- 233-Senior Suites of Hegewischscore 36
Senior Living Community · 60,600 sq ft
See also: most efficient in Chicago · biggest emitters
How does Ariel / U of C NKO 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. Ariel / U of C NKO's ENERGY STAR score of 22 compares with an average of 45 across the 365 that report a score; it scores higher than 21% of them and lower than 77%. Its site EUI of 87.9 kBtu/ft² is about 21% above the average of 72.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 7.3 kgCO₂e/ft² is about 18% above the group average of 6.2 kgCO₂e/ft².
At 147,109 sq ft, it is about 21% above the average floor area of 121,824 sq ft for those buildings. It was built in 1893, 50 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 Ariel / U of C NKO's energy performance changed over time?
BuildingCensus holds 9 Chicago disclosures for Ariel / U of C NKO, covering report years 2015–2023. Its ENERGY STAR score went from 44 in 2015 to 22 in 2023 (-22 points); its best year on file was 2015, at 44. Site EUI moved from 82.3 kBtu/ft² (2015) to 87.9 kBtu/ft² (2023), an 7% increase. Reported emissions went from 1,275 tCO₂e to 1,067 tCO₂e over the same span (down 16%).
What does an ENERGY STAR score of 22 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 22 means the building performs better than about 22% of its national peers. BuildingCensus bands the score into report-card grades; 22 falls in band D — lowest band (1–54). It sits 53 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. Ariel / U of C NKO's 87.9 kBtu/ft² across 147,109 sq ft works out to about 12.9 billion Btu (3,790 MWh-equivalent) in 2023. Its source EUI of 144.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,282,555 kWh of electricity and 85,566 therms of natural gas for the year.
Which law requires Ariel / U of C NKO to report its energy use?
Ariel / U of C NKO 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:251574:2023). 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
- Armstrong G· 147,016 sq ft · score 22 (D)
- Portage Park· 145,775 sq ft · score 59 (C)
- Bradwell· 143,266 sq ft · score 77 (B)
- Bouchet· 141,329 sq ft · score 27 (D)
- Nightingale· 140,838 sq ft · score 10 (D)
- Marsh· 140,770 sq ft · score 43 (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 Ariel / U of C NKO's energy grade?
Ariel / U of C NKO scores 22 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 Ariel / U of C NKO use?
Its 2023 site energy-use intensity was 87.9 kBtu/ft² (144.4 kBtu/ft² source) across 147,109 sq ft, including 1,282,555 kWh of electricity and 85,566 therms of natural gas.
What are Ariel / U of C NKO's carbon emissions?
Ariel / U of C NKO reported 1,067 tCO₂e of greenhouse-gas emissions (7.3 kgCO₂e/ft²) for 2023.
Where is Ariel / U of C NKO?
Ariel / U of C NKO is at 1119 E 46th St, in Chicago, Illinois 60653. Its coordinates are 41.84699, -87.67556 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Ariel / U of C NKO and when was it built?
Ariel / U of C NKO has 147,109 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1893 as its year built. It is classed as K-12 school.
Is Ariel / U of C NKO 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, “Ariel / U of C NKO, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/ariel-u-of-c-nko-273cfc7d (data as of October 2, 2026).