factors, including lack of near-term growth in the operating segment. The impairment test determined there was no implied value of goodwill, which resulted in an impairment charge of $55.9 million, which was recognized in goodwill impairment within the consolidated statement of operations for the year ended December 31, 2016. There was no goodwill impairment recognized during the year ended December 31, 2015.
Impairment of Renewable Energy Facilities
During 2016, the Company began exploring a sale of substantially all of its portfolio of residential rooftop solar assets located in the United States through a strategic sales process, and these assets were determined to meet the criteria to be classified as held for sale during the fourth quarter of 2016. The Company's analysis indicated that the carrying value of the assets exceeded the fair value less costs to sell, and thus an impairment charge of $15.7 million was recognized within impairment of renewable energy facilities in the consolidated statement of operations for the year ended December 31, 2016. The Company also recorded a $3.3 million charge within impairment of renewable energy facilities for the year ended December 31, 2016 due to the decision to abandon certain residential construction in progress assets that were not completed by SunEdison as a result of the SunEdison Bankruptcy. There was no impairment of renewable energy facilities recognized during the year ended December 31, 2015.
Depreciation, Accretion and Amortization
Depreciation, accretion and amortization expense increased by $82.1 million during the year ended December 31, 2016, compared to the same period in 2015, due to:
Increases in depreciation, accretion and amortization relating to acquisitions of renewable energy facilities from SunEdison and unaffiliated third parties
Decrease in depreciation, accretion and amortization related to the U.K. Portfolio assets held for sale classification as of the first quarter of 2016
Interest Expense, Net
Interest expense, net for the years ended December 31, 2016 and 2015 was as follows:
Year Ended December 31,
Total interest expense, net
Interest expense, net increased by $142.5 million during the year ended December 31, 2016, compared to the same period in 2015, due to increased indebtedness resulting from the acquisition of wind power plants and increased corporate-level indebtedness under the Revolver and the issuance of the Senior Notes due 2025. In addition, during the second quarter, the Company discontinued hedge accounting for interest rate swaps that were previously designated as cash flow hedges of the forecasted interest payments pertaining to variable rate project debt in the U.K. portfolio. This resulted in the reclassification of $16.9 million of losses from accumulated other comprehensive income into interest expense. Subsequent to the discontinuation of hedge accounting, the Company recognized additional unrealized losses of $7.3 million pertaining to these interest rate swaps that are also reported in interest expense. During the year ended December 31, 2015, we reported an inconsequential amount of interest income related to interest rate swap derivatives not designated as hedges within interest expense, net in the consolidated statement of operations.
Loss on Extinguishment of Debt, net
We incurred a net loss on extinguishment of debt of $1.1 million for the year ended December 31, 2016, driven by a reduction in borrowing capacity for the Revolver and corresponding write-off of a portion of the unamortized deferred financing costs, due to the Company entering into the consent agreement and ninth amendment to the terms of the Revolver and