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Geographic Information | 12 Months Ended
--- | ---
Dec. 31, 2023
Segments, Geographical Areas [Abstract] |
Geographic Information | GEOGRAPHIC INFORMATION The following table presents our long-lived assets related to our operations by geographic area:
| As of December 31,
| 2023 |  | 2022
Long-lived Tangible Assets |  |  |
United States | $ | 1,670,322 |  |  | $ | 1,162,705 |
Canada | 23,549 |  | 24,590
Europe | 12,948 |  |  | 9,937 |
Total long-lived assets | $ | 1,706,819 |  |  | $ | 1,197,232 |
We attribute revenues to customers based on the location of the customer. The following table presents revenues by geographic region:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Revenues |  |  |  |  |
United States | $ | 1,161,775 |  |  | $ | 1,712,326 |  |  | $ | 1,126,141 |
Canada | 63,367 |  | 53,461 |  | 45,782
Europe | 149,491 |  |  | 58,635 |  |  | 43,774 |
Total revenues | $ | 1,374,633 |  |  | $ | 1,824,422 |  |  | $ | 1,215,697 |
BUSINESS SEGMENT INFORMATION Our reportable segments for the year ended December 31, 2023 were U.S. Regions, U.S. Federal, Canada, Alternative Fuels, and Europe. The remaining amounts are included in “All Other”. Europe was formerly included in “All Other” but was disaggregated due to growth in the segment in 2023. As a result, previously reported amounts have been reclassified for comparative purposes. Our U.S. Regions, U.S. Federal, Canada, 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 which include the 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, 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. Our U.S. Regions segment also includes certain small-scale solar grid-tie plants developed for customers. The “All Other” category offers 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. For the years ended December 31, 2023, 2022, and 2021, 71.8%, 46.0%, and 67.0%, respectively, of our revenues have been derived from federal, state, provincial, or local government entities, including public housing authorities, public universities and municipal utilities. The U.S. federal government, which is considered a single customer for reporting purposes, constituted 29.3%, 21.5%, and 32.3% of our consolidated revenues for the years ended December 31, 2023, 2022, and 2021, respectively. Revenues from the U.S. federal government are included in our U.S. Federal segment. Other than the U.S. federal government, one customer represented 39.6% of our revenues during the year ended December 31, 2022. Revenues from this customer is included in our U.S. Regions segment. The reports of our chief operating decision maker do not include assets at the operating segment level. The table below presents our business segment information and reconciliation to our consolidated financial statements:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Alternative Fuels |  | Europe |  | All Other |  | Total
2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 557,122 |  |  | $ | 402,884 |  |  | $ | 70,110 |  |  | $ | 117,075 |  |  | $ | 152,842 |  |  | $ | 74,600 |  |  | $ | 1,374,633 |
Earnings from unconsolidated entities | — |  |  | 1,758 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,758 |
(Gain) loss on derivatives | (2,326) |  |  | 857 |  |  | (136) |  |  | 497 |  |  | — |  |  | — |  |  | (1,108) |
Net interest expense (income) | 6,169 |  |  | 1,429 |  |  | 834 |  |  | 16,019 |  |  | 2,477 |  |  | (6) |  |  | 26,922 |
Depreciation and intangible asset amortization | 27,060 |  |  | 5,343 |  |  | 1,626 |  |  | 26,160 |  |  | 2,290 |  |  | 1,650 |  |  | 64,129 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (68,372) |
Income before taxes, excluding unallocated corporate activity | 38,746 |  |  | 49,237 |  |  | 3,813 |  |  | 6,215 |  |  | 4,188 |  |  | 4,442 |  |  | 106,641 |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 1,123,343 |  |  | 391,891 |  |  | 58,558 |  |  | 114,459 |  |  | 61,645 |  |  | 74,526 |  |  | 1,824,422 |
Earnings from unconsolidated entities | — |  |  | 1,647 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,647 |
(Gain) loss on derivatives | (354) |  |  | — |  |  | (152) |  |  | 294 |  |  | — |  |  | — |  |  | (212) |
Net interest expense (income) | 6,948 |  |  | 1,231 |  |  | 917 |  |  | 8,657 |  |  | 25 |  |  | (3) |  |  | 17,775 |
Depreciation and intangible asset amortization | 21,463 |  |  | 4,905 |  |  | 1,702 |  |  | 23,354 |  |  | 575 |  |  | 433 |  |  | 52,432 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (71,180) |
Income before taxes, excluding unallocated corporate activity | 88,531 |  |  | 50,866 |  |  | 2,554 |  |  | 22,989 |  |  | 5,589 |  |  | 6,370 |  |  | 176,899 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 551,118 |  |  | 392,948 |  |  | 49,483 |  |  | 111,223 |  |  | 46,164 |  |  | 64,761 |  |  | 1,215,697 |
Loss from unconsolidated entities | (56) |  |  | — |  |  | — |  |  | — |  |  | (62) |  |  | — |  |  | (118) |
(Gain) loss on derivatives | (1,017) |  |  | — |  |  | (73) |  |  | 1,330 |  |  | — |  |  | — |  |  | 240 |
Net interest expense | 6,255 |  |  | 1,294 |  |  | 879 |  |  | 5,793 |  |  | 378 |  |  | — |  |  | 14,599 |
Depreciation and intangible asset amortization | 15,699 |  |  | 4,666 |  |  | 1,872 |  |  | 21,080 |  |  | 716 |  |  | 724 |  |  | 44,757 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (47,361) |
Income before taxes, excluding unallocated corporate activity | 38,285 |  |  | 52,388 |  |  | 1,581 |  |  | 27,774 |  |  | 2,997 |  |  | 2,480 |  |  | 125,505 |
See Note 3 for additional information about our revenues by product line.

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