Carbon LLC
Office in Washington, DC, DC · 501 School Street, S.W. · 20024
At a glance
Carbon LLC is a 67,000-square-foot office building at 501 School Street, S.W. in Washington, DC, built in 1988. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 29 out of 100 (grade D), a site energy-use intensity of 58.5 kBtu/ft² and 312 tCO₂e of greenhouse-gas emissions. That score is higher than 6% of the 774 scored office buildings in Washington, DC.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 29 (band D) |
| Site EUI | 58.5 kBtu/ft² |
| Source EUI | 163.8 kBtu/ft² |
| GHG emissions | 312 tCO₂e |
| GHG intensity | 4.7 kgCO₂e/ft² |
| Electricity | 1,148,468 kWh |
| Natural gas | 0 therms |
| Water use | 530 kgal |
| Gross floor area | 67,000 sq ft |
| Source record | dc:PM6268144:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 29 | +5 | 58.5 kBtu/ft² | 312 tCO₂e |
| 2019 | 24 | -44 | 64.0 kBtu/ft² | 398 tCO₂e |
| 2018 | 68 | -12 | 39.0 kBtu/ft² | 447 tCO₂e |
| 2017 | 80 | 46.8 kBtu/ft² | 435 tCO₂e |
Compliance context
Clean and Affordable Energy Act / BEPS
DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
Ownership
CARBON LLC
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Location
- Address
- 501 School Street, S.W.
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20024
- Coordinates
- 38.88413, -77.01915
Within ~1 km
Nearby benchmarked buildings
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- Two Independence Squarescore 99
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- The Channel (lh71)score —
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- Capital Galleryscore 74
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- 670 Mainescore 69
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See also: most efficient in Washington, DC · biggest emitters
How does Carbon LLC compare with other office buildings in Washington, DC?
The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. Carbon LLC's ENERGY STAR score of 29 compares with an average of 70 across the 774 that report a score; it scores higher than 6% of them and lower than 94%. Its site EUI of 58.5 kBtu/ft² is roughly in line with the average of 55.6 kBtu/ft². Its emissions intensity of 4.7 kgCO₂e/ft² is roughly in line with the group average of 5.0 kgCO₂e/ft².
At 67,000 sq ft, it is about 69% below the average floor area of 216,135 sq ft for those buildings. It was built in 1988, 14 years later than the group's average year built (1974). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has Carbon LLC's energy performance changed over time?
BuildingCensus holds 4 Washington, DC disclosures for Carbon LLC, covering report years 2017, 2018, 2019, 2024. Its ENERGY STAR score went from 80 in 2017 to 29 in 2024 (-51 points); its best year on file was 2017, at 80. Site EUI moved from 46.8 kBtu/ft² (2017) to 58.5 kBtu/ft² (2024), an 25% increase. Reported emissions went from 435 tCO₂e to 312 tCO₂e over the same span (down 28%).
What does an ENERGY STAR score of 29 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 29 means the building performs better than about 29% of its national peers. BuildingCensus bands the score into report-card grades; 29 falls in band D — lowest band (1–54). It sits 46 points below 75, the threshold for ENERGY STAR certification. In Washington, DC, 47% 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. Carbon LLC's 58.5 kBtu/ft² across 67,000 sq ft works out to about 3.9 billion Btu (1,149 MWh-equivalent) in 2024. Its source EUI of 163.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,148,468 kWh of electricity, 0 therms of natural gas and 530 thousand gallons of water for the year.
Which law requires Carbon LLC to report its energy use?
Carbon LLC reports under the Clean and Affordable Energy Act / BEPS, the legal basis of Washington, DC's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record dc:PM6268144:2024). DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
More office buildings in Washington, DC
- Brookings Institution Annex - 1755 Mass Ave· 66,966 sq ft · score 44 (D)
- Neon LLC· 66,909 sq ft · score 45 (D)
- 1319 F Street· 66,760 sq ft · score 73 (B)
- 801 Pennsylvania Avenue SE· 66,691 sq ft · score 61 (C)
- Jefferson Building· 65,799 sq ft · score 62 (C)
- 1634 Eye Street· 65,245 sq ft · score 49 (D)
- Office buildings in Washington, DC· 899 benchmarked
- All Washington, DC benchmarked buildings· Clean and Affordable Energy Act / BEPS
- Most efficient large buildings in Washington, DC
- Least efficient large buildings in Washington, DC
- Biggest emitters in Washington, DC
Frequently asked questions
What is Carbon LLC's energy grade?
Carbon LLC scores 29 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Carbon LLC use?
Its 2024 site energy-use intensity was 58.5 kBtu/ft² (163.8 kBtu/ft² source) across 67,000 sq ft, including 1,148,468 kWh of electricity and 0 therms of natural gas.
What are Carbon LLC's carbon emissions?
Carbon LLC reported 312 tCO₂e of greenhouse-gas emissions (4.7 kgCO₂e/ft²) for 2024.
Where is Carbon LLC?
Carbon LLC is at 501 School Street, S.W., in Washington, DC 20024. Its coordinates are 38.88413, -77.01915 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Carbon LLC and when was it built?
Carbon LLC has 67,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1988 as its year built. It is classed as office.
Is Carbon LLC covered by the Clean and Affordable Energy Act / BEPS?
Yes — it appears in the 2024 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Clean and Affordable Energy Act / BEPS.
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About this data
Source: Building Energy Benchmarking (Clean and Affordable Energy Act / BEPS), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Carbon LLC, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/carbon-llc-d267de4b (data as of July 9, 2026).