A.C. Stelle Middle School
K-12 School in California, CA · 22450 Mulholland Hwy., Calabasas · 91302
At a glance
A.C. Stelle Middle School is a 109,938-square-foot K-12 school at 22450 Mulholland Hwy., Calabasas in Calabasas, California, built in 2002. In its 2023 California benchmarking disclosure it reported an ENERGY STAR score of 55 out of 100 (grade C), a site energy-use intensity of 40.5 kBtu/ft² and 270 tCO₂e of greenhouse-gas emissions. That score is higher than 19% of the 2,016 scored K-12 school buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 55 (band C) |
| Site EUI | 40.5 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 270 tCO₂e |
| GHG intensity | 2.5 kgCO₂e/ft² |
| Electricity | 786,906 kWh |
| Natural gas | 17,342 therms |
| Gross floor area | 109,938 sq ft |
| Source record | california:3965805:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 55 | -12 | 40.5 kBtu/ft² | 270 tCO₂e |
| 2022 | 67 | 38.1 kBtu/ft² | 256 tCO₂e |
Compliance context
AB 802 (Public Resources Code §25402.10)
AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 22450 Mulholland Hwy., Calabasas
- City
- California
- State
- California
- ZIP
- 91302
- Coordinates
- 34.14213, -118.61242
Within ~1 km
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See also: most efficient in California · biggest emitters
How does A.C. Stelle Middle School compare with other K-12 school buildings in California?
The latest disclosures cover 2,128 K-12 school buildings in California, out of 40,029 buildings citywide. A.C. Stelle Middle School's ENERGY STAR score of 55 compares with an average of 74 across the 2,016 that report a score; it scores higher than 19% of them and lower than 80%. Its site EUI of 40.5 kBtu/ft² is about 17% above the average of 34.6 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.5 kgCO₂e/ft² is about 25% above the group average of 2.0 kgCO₂e/ft².
At 109,938 sq ft, it is about 15% below the average floor area of 129,123 sq ft for those buildings. It was built in 2002, 26 years later than the group's average year built (1976). 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 A.C. Stelle Middle School's energy performance changed over time?
BuildingCensus holds 2 California disclosures for A.C. Stelle Middle School, covering report years 2022–2023. Its ENERGY STAR score went from 67 in 2022 to 55 in 2023 (-12 points); its best year on file was 2022, at 67. Site EUI moved from 38.1 kBtu/ft² (2022) to 40.5 kBtu/ft² (2023), an 6% increase. Reported emissions went from 256 tCO₂e to 270 tCO₂e over the same span (up 6%).
What does an ENERGY STAR score of 55 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 55 means the building performs better than about 55% of its national peers. BuildingCensus bands the score into report-card grades; 55 falls in band C — below median (55–69). It sits 20 points below 75, the threshold for ENERGY STAR certification. In California, 65% 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. A.C. Stelle Middle School's 40.5 kBtu/ft² across 109,938 sq ft works out to about 4.5 billion Btu (1,305 MWh-equivalent) in 2023. The disclosure also reports 786,906 kWh of electricity and 17,342 therms of natural gas for the year.
Which law requires A.C. Stelle Middle School to report its energy use?
A.C. Stelle Middle School reports under AB 802 (Public Resources Code §25402.10), the legal basis of California's Building Energy Benchmarking Program (statewide), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record california:3965805:2023). AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.
More K-12 school buildings in California
- John Glenn Middle School· 109,694 sq ft · score 78 (B)
- Orosi High School· 109,649 sq ft · score 99 (A)
- Burlingame Intermediate School· 109,648 sq ft · score 99 (A)
- Benicia Middle· 109,360 sq ft · score 100 (A)
- Zamorano Elementary· 109,358 sq ft · score 90 (A)
- Desert Ridge Academy· 108,948 sq ft · score 90 (A)
- K-12 School buildings in California· 2,128 benchmarked
- All California benchmarked buildings· AB 802 (Public Resources Code §25402.10)
- Most efficient large buildings in California
- Least efficient large buildings in California
- Biggest emitters in California
Frequently asked questions
What is A.C. Stelle Middle School's energy grade?
A.C. Stelle Middle School scores 55 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2023 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does A.C. Stelle Middle School use?
Its 2023 site energy-use intensity was 40.5 kBtu/ft² across 109,938 sq ft, including 786,906 kWh of electricity and 17,342 therms of natural gas.
What are A.C. Stelle Middle School's carbon emissions?
A.C. Stelle Middle School reported 270 tCO₂e of greenhouse-gas emissions (2.5 kgCO₂e/ft²) for 2023.
Where is A.C. Stelle Middle School?
A.C. Stelle Middle School is at 22450 Mulholland Hwy., Calabasas, in Calabasas, California 91302. Its coordinates are 34.14213, -118.61242 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is A.C. Stelle Middle School and when was it built?
A.C. Stelle Middle School has 109,938 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2002 as its year built. It is classed as K-12 school.
Is A.C. Stelle Middle School covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2023 Building Energy Benchmarking Program (statewide) disclosure, which lists the buildings reporting under AB 802 (Public Resources Code §25402.10).
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About this data
Source: Building Energy Benchmarking Program (statewide) (AB 802 (Public Resources Code §25402.10)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “A.C. Stelle Middle School, Calabasas, California — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/california/a-c-stelle-middle-school-fa27f19d (data as of July 9, 2026).