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Business Segment Information | 3 Months Ended
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Mar. 31, 2024
Segment Reporting [Abstract] |
BUSINESS SEGMENT INFORMATION | BUSINESS SEGMENT INFORMATION Our reportable segments for the three months ended March 31, 2024 were North America Regions, U.S. Federal, Europe, Alternative Fuels and All Other. On January 1, 2024, we changed the structure of our internal organization, and our U.S. Regions and Canada are now included in North America Regions. Additionally, our Asset Sustainability Group was formerly included in Canada, but is now included in “All Other”. As a result, previously reported amounts have been reclassified for comparative purposes. Our North America Regions, U.S. Federal and Europe 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, thermal, renewable fuel, or biomethane using biogas as a feedstock from small-scale plants that we own and operate, and provides O&M services for customer-owned small-scale plants. The “All Other” category includes consulting services 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:
| North America Regions |  | U.S. Federal |  | Europe |  | Alternative Fuels |  | All Other |  | Total Consolidated
Three months ended March 31, 2024 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 138,285 |  |  | $ | 60,890 |  |  | $ | 44,122 |  |  | $ | 32,859 |  |  | $ | 22,250 |  |  | $ | 298,406 |
Gain on derivatives | (1,256) |  |  | (795) |  |  | — |  |  | (308) |  |  | — |  |  | (2,359) |
Interest expense, net of interest income | 1,697 |  |  | 775 |  |  | 918 |  |  | 5,682 |  |  | — |  |  | 9,072 |
Depreciation and amortization of intangible assets | 8,074 |  |  | 2,016 |  |  | 496 |  |  | 7,196 |  |  | 596 |  |  | 18,378 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (22,143) |
Income before taxes, excluding unallocated corporate activity | 5,593 |  |  | 7,357 |  |  | (592) |  |  | 1,176 |  |  | 2,431 |  |  | 15,965 |
| North America Regions |  | U.S. Federal |  | Europe |  | Alternative Fuels |  | All Other |  | Total Consolidated
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 140,542 |  |  | $ | 59,556 |  |  | $ | 19,096 |  |  | $ | 28,339 |  |  | $ | 23,509 |  |  | $ | 271,042 |
(Gain) loss on derivatives | (295) |  |  | (62) |  |  | — |  |  | 520 |  |  | — |  |  | 163 |
Interest expense, net of interest income | 1,585 |  |  | 298 |  |  | 121 |  |  | 2,351 |  |  | (2) |  |  | 4,353 |
Depreciation and amortization of intangible assets | 6,453 |  |  | 1,225 |  |  | 175 |  |  | 5,868 |  |  | 131 |  |  | 13,852 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (18,843) |
Income before taxes, excluding unallocated corporate activity | 8,250 |  |  | 5,212 |  |  | 123 |  |  | 3,515 |  |  | 2,797 |  |  | 19,897 |
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 -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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