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Business Segment Information
 3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Business Segment Information BUSINESS SEGMENT INFORMATIONOur reportable segments for the three months ended March 31, 2022 were U.S. Regions, U.S. Federal, Canada, Non-Solar DG and All Other. On January 1, 2022, we changed the structure of our internal organization and our “All Other” segment now includes our U.S.-based enterprise energy management services previously included in our U.S Regions segment and our U.S. Regions segment now includes U.S. project revenue and associated costs previously included in our Non-Solar DG segment. As a result, previously reported amounts have been reclassified for comparative purposes.
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 Non-Solar DG segment sells electricity, processed renewable gas fuel, heat or cooling, produced from renewable sources of energy, other than solar, and generated by small-scale plants that we own and O&M services for customer-owned small-scale 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. FederalCanadaNon-Solar DGAll 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 
Three Months Ended March 31, 2021
Revenues$89,244 $102,214 $11,643 $25,580 $23,521 $252,202 
Loss (gain) on derivatives532 — 179 (1,074)— (363)
Interest expense, net of interest income1,443 321 207 610 159 2,740 
Depreciation and amortization of intangible assets3,486 1,010 415 4,862 377 10,150 
Unallocated corporate activity— — — — — (10,965)
Income before taxes, excluding unallocated corporate activity3,239 12,030 (85)8,772 1,645 25,601 
See Note 3 for additional information about our revenues by product line.