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Business Segment Information | 3 Months Ended
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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. Regions |  | U.S. Federal |  | Canada |  | Alternative Fuels |  | All Other |  | Total 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 income | 1,403 |  |  | 298 |  |  | 182 |  |  | 2,351 |  |  | 119 |  |  | 4,353 |
Depreciation and amortization of intangible assets | 6,049 |  |  | 1,225 |  |  | 405 |  |  | 5,868 |  |  | 304 |  |  | 13,851 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (18,843) |
Income before taxes, excluding unallocated corporate activity | 7,956 |  |  | 5,212 |  |  | 732 |  |  | 3,515 |  |  | 2,482 |  |  | 19,897 |
| U.S. Regions |  | U.S. Federal |  | Canada |  | Alternative Fuels |  | All Other |  | Total Consolidated
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 314,520 |  |  | $ | 75,646 |  |  | $ | 17,172 |  |  | $ | 29,261 |  |  | $ | 37,403 |  |  | $ | 474,002 |
Loss on derivatives | 227 |  |  | 51 |  |  | — |  |  | 1,344 |  |  | — |  |  | 1,622 |
Interest expense, net of interest income | 1,642 |  |  | 306 |  |  | 222 |  |  | 1,790 |  |  | (7) |  |  | 3,953 |
Depreciation and amortization of intangible assets | 5,278 |  |  | 1,245 |  |  | 447 |  |  | 5,416 |  |  | 271 |  |  | 12,657 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (15,909) |
Income before taxes, excluding unallocated corporate activity | 18,218 |  |  | 8,886 |  |  | 279 |  |  | 7,422 |  |  | 2,709 |  |  | 37,514 |
See Note 3 for additional information about our revenues by product line.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI https://asc.fasb.org/topic&trid=2134510 + Details
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