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<br />project. Similarly, if we recognize revenue based upon our current estimate of variable consideration, and our estimate is later adjusted, we may be required to increase or
<br />decrease cumulative revenue to date and gross profit on the project. Factors that may result in a change to our estimates include unforeseen engineering problems, construction
<br />delays, the performance of contractors and major material suppliers, and unusual weather conditions, among others.
<br />We have a long history of working with multiple types of projects and preparing cost estimates, and we rely on the expertise of key personnel to prepare what we believe are
<br />reasonable best estimates given available facts and circumstances. Due to the nature of the work involved, however, judgment is involved to estimate the costs to complete and
<br />the amounts estimated could have a material impact on the revenue we recognize in each accounting period. We cannot estimate unforeseen events and circumstances which
<br />may result in actual results being materially different from previous estimates.
<br />Impairment Assessments
<br />We evaluate our long-lived assets, including goodwill and intangible assets, for impairment as events or changes in circumstances indicate the carrying value of these assets
<br />may not be fully recoverable, and at least annually (fourth quarter) for goodwill and intangible assets that have indefinite lives. In 2023, we changed the assessment date from
<br />December 31, 2023 to October 31, 2023. Examples of such triggering events applicable to our assets include a significant decrease in the market price of a long-lived asset or
<br />asset group, a current -period operating or cash flow loss combined with a history of operating or cash flow losses, a projection or forecast that demonstrates continuing losses
<br />associated with the use of a long-lived asset or asset group, or adverse industry or economic trends.
<br />We evaluate recoverability of long-lived assets and definite -lived intangible assets by estimating the undiscounted future cash flows associated with the expected uses and
<br />eventual disposition of those assets. When these comparisons indicate that the carrying value of those assets is greater than the undiscounted cash flows, we recognize an
<br />impairment loss for the amount that the carrying value exceeds the fair value.
<br />The process of evaluating the potential impairment of long-lived assets, goodwill and intangible assets requires significant judgment. For goodwill, we estimate the reporting
<br />unit's fair value and compare it with the carrying value of the reporting unit, including goodwill. If the fair value is greater than the carrying value of its reporting unit, no
<br />impairment is recorded. Fair value is determined using both an income approach and a market approach. The estimates and assumptions used in our calculations include revenue
<br />growth rates, expense growth rates, expected capital expenditures to determine projected cash flows, expected tax rates and an estimated discount rate to determine present value
<br />of expected cash flows. These estimates are based on historical experiences, our projections of future operating activity and our weighted -average cost of capital. Unforeseen
<br />events and changes in circumstances or market conditions could adversely affect these estimates, which could result in an impairment charge.
<br />Based on our assessment during the year ended December 31, 2023, one reporting unit had a fair value that was 2% less than the carrying value and we recorded a $1,644
<br />goodwill impairment, which was $2,222 net of tax and was primarily driven by a decline in projected cash flows, including revenues and profitability. One reporting unit with
<br />goodwill had an estimated fair value that exceeded its carrying value by 16%. All other reporting units with goodwill had estimated fair values that exceeded their carrying
<br />values by at least 65% as of December 31, 2023.
<br />Income Taxes
<br />We are subject to income taxes in the U.S. and five foreign jurisdictions. Significant judgment is required in determining income tax expense, deferred tax assets and liabilities
<br />and uncertain tax positions. The underlying assumptions are also highly susceptible to change from period to period. We took advantage of the Safe Harbor commence -
<br />construction provisions contained in IRS Notice 2018-59 by pre -purchasing solar equipment in 2019 thereby preserving the ability to take 30% ITC for projects placed in service
<br />before 2024. However, the IRA signed by the President on August 16, 2022 increased the ITC rate back to 30% for projects placed in service after January 1, 2022 and before
<br />January 1, 2033. If these or other deductions and credits expire without being extended, or otherwise are reduced or eliminated, our effective tax rate would increase, which
<br />could increase our income tax expense and reduce our net income. In addition, our tax rate has historically been significantly impacted by the IRC Section 179D deduction.
<br />This deduction is related to energy -efficient improvements we provide under government contracts. The Consolidated Appropriations Act, 2021 made permanent the Section
<br />179D Energy Efficient Commercial Building Deduction. That Act made changes to the way the deduction is calculated. On December 23, 2022, the IRS issued Announcement
<br />2023-1 which clarified the energy efficiency standards which will be applied to projects placed in service for 2021 and 2022. If those changes result in lower levels of energy
<br />efficiency improvements, it could impact the deduction available and the tax rate.
<br />We accrue for the estimated additional tax and interest that may result from tax authorities disputing uncertain tax positions. We believe we have made adequate provisions for
<br />income taxes for all years that are subject to audit based upon the latest information available. We operate within multiple taxing jurisdictions and are subject to tax audits in
<br />these jurisdictions. These audits can
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