1666 Connecticut Ave NW

How does 1666 Connecticut Ave NW compare with other office buildings in Washington, DC?

The latest disclosures cover 899 office buildings in Washington, DC, out of 6,870 buildings citywide. 1666 Connecticut Ave NW's ENERGY STAR score of 85 compares with an average of 70 across the 774 that report a score; it scores higher than 77% of them and lower than 19%. Its site EUI of 44.7 kBtu/ft² is about 20% below the average of 55.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 3.4 kgCO₂e/ft² is about 33% below the group average of 5.0 kgCO₂e/ft².

At 79,044 sq ft, it is about 63% below the average floor area of 216,135 sq ft for those buildings. It was built in 1962, 12 years earlier 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 1666 Connecticut Ave NW's energy performance changed over time?

BuildingCensus holds 11 Washington, DC disclosures for 1666 Connecticut Ave NW, covering report years 2014–2024. Its ENERGY STAR score went from 50 in 2014 to 85 in 2024 (+35 points). Site EUI moved from 95.2 kBtu/ft² (2014) to 44.7 kBtu/ft² (2024), a 53% decrease. Reported emissions went from 852 tCO₂e to 266 tCO₂e over the same span (down 69%).

What does an ENERGY STAR score of 85 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 85 means the building performs better than about 85% of its national peers. BuildingCensus bands the score into report-card grades; 85 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. 1666 Connecticut Ave NW's 44.7 kBtu/ft² across 79,044 sq ft works out to about 3.5 billion Btu (1,035 MWh-equivalent) in 2024. Its source EUI of 97.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 662,558 kWh of electricity, 12,764 therms of natural gas and 689 thousand gallons of water for the year.

Which law requires 1666 Connecticut Ave NW to report its energy use?

1666 Connecticut Ave NW 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:PM3955321:2024). 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.