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Business Segment Information
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Business Segment Information BUSINESS SEGMENT INFORMATION
Our reportable segments for the three months ended March 31, 2023 were U.S. Regions, U.S. Federal, Canada, Alternative Fuels and All Other.
Our U.S. Regions, U.S. Federal and Canada segments offer energy efficiency products and services which include the design, engineering and installation of equipment and other measures to improve the efficiency and control the operation of a facility’s energy infrastructure, renewable energy solutions and services and the development and construction of small-scale plants that Ameresco owns or develops for customers that produce electricity, gas, heat or cooling from renewable sources of energy and O&M services.
Our Alternative Fuels segment sells electricity and processed renewable natural gas (“RNG”) derived from biomethane from small-scale plants that we own and operate, and provides O&M services for customer-owned small-scale RNG plants.
The “All Other” category includes enterprise energy management services, other than the U.S.-based portion; consulting services, energy efficiency products and services outside of the U.S. and Canada; and the sale of solar PV energy products and systems which we refer to as integrated-PV.
These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. Certain reportable segments are an aggregation of operating segments.
The tables below present our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements:
U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal Consolidated
Three Months Ended March 31, 2023
Revenues$124,369 $59,556 $18,411 $28,339 $40,367 $271,042 
(Gain) loss on derivatives(303)(62)8 520 — 163 
Interest expense, net of interest income1,403 298 182 2,351 119 4,353 
Depreciation and amortization of intangible assets6,049 1,225 405 5,868 304 13,851 
Unallocated corporate activity— — — — — (18,843)
Income before taxes, excluding unallocated corporate activity7,956 5,212 732 3,515 2,482 19,897 

U.S. RegionsU.S. FederalCanadaAlternative FuelsAll OtherTotal Consolidated
Three Months Ended March 31, 2022
Revenues$314,520 $75,646 $17,172 $29,261 $37,403 $474,002 
Loss on derivatives227 51 — 1,344 — 1,622 
Interest expense, net of interest income1,642 306 222 1,790 (7)3,953 
Depreciation and amortization of intangible assets5,278 1,245 447 5,416 271 12,657 
Unallocated corporate activity— — — — — (15,909)
Income before taxes, excluding unallocated corporate activity18,218 8,886 279 7,422 2,709 37,514 
See Note 3 for additional information about our revenues by product line.