Chastleton Cooperative

How does Chastleton Cooperative compare with other multifamily housing buildings in Washington, DC?

The latest disclosures cover 1,799 multifamily housing buildings in Washington, DC, out of 6,870 buildings citywide. Chastleton Cooperative's ENERGY STAR score of 89 compares with an average of 72 across the 1,618 that report a score; it scores higher than 68% of them and lower than 30%. Its site EUI of 39.8 kBtu/ft² is about 22% below the average of 51.1 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.9 kgCO₂e/ft² is about 24% below the group average of 3.8 kgCO₂e/ft².

At 314,289 sq ft, it is about 131% above the average floor area of 136,346 sq ft for those buildings. It was built in 1920, 45 years earlier than the group's average year built (1965). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².

How has Chastleton Cooperative's energy performance changed over time?

BuildingCensus holds 13 Washington, DC disclosures for Chastleton Cooperative, covering report years 2012–2024. Its ENERGY STAR score went from 99 in 2014 to 89 in 2024 (-10 points); its best year on file was 2014, at 99. Site EUI moved from 36.0 kBtu/ft² (2012) to 39.8 kBtu/ft² (2024), an 11% increase. Reported emissions went from 854 tCO₂e to 911 tCO₂e over the same span (up 7%).

What does an ENERGY STAR score of 89 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 89 means the building performs better than about 89% of its national peers. BuildingCensus bands the score into report-card grades; 89 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. Chastleton Cooperative's 39.8 kBtu/ft² across 314,289 sq ft works out to about 12.5 billion Btu (3,666 MWh-equivalent) in 2024. Its source EUI of 81.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,077,365 kWh of electricity, 54,323 therms of natural gas and 8,041 thousand gallons of water for the year.

Which law requires Chastleton Cooperative to report its energy use?

Chastleton Cooperative 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:PM2923735:2024). 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.