statements will not be prevented or detected on a timely basis, and therefore we concluded that the deficiencies represent material weaknesses in our internal control over financial reporting and our internal control over financial reporting was not effective as of December 31, 2018.
The existence of these or other material weaknesses in our internal control over financial reporting could also result in errors in our financial statements that could require us to restate our financial statements, cause us to fail to meet our reporting obligations and cause stockholders to lose confidence in our reported financial information, all of which could materially and adversely affect our business and stock price.
A significant portion of our assets consists of long-lived assets, the value of which may be reduced if we determine that those assets are impaired.
As of December 31, 2018, the net carrying value of long-lived assets represented $8,587.0 million, or 92%, of our total assets and consisted of renewable energy facilities, intangible assets and goodwill from the acquisition of Saeta. Renewable energy facilities and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate carrying values may not be recoverable. An impairment loss is recognized if the total future estimated undiscounted cash flows expected from an asset are less than its carrying value.
We currently have a REC sales agreement with a customer expiring December 31, 2021 that is significant to a distributed generation solar project, and on March 31, 2018, this customer filed for protection under Chapter 11 of the U.S. Bankruptcy Code. The potential replacement of this contract would likely result in a significant decrease in our expected revenues. Our analysis indicated that the bankruptcy filing was a triggering event to perform an impairment evaluation, and the carrying amount of $19.5 million as of March 31, 2018 was no longer considered recoverable based on an undiscounted cash flow forecast. We estimated the fair value of the operating project at $4.3 million as of March 31, 2018 and recognized an impairment charge of $15.2 million equal to the difference between the carrying amount and the estimated fair value, which is reflected within impairment of renewable energy facilities in our consolidated statements of operations for the year ended December 31, 2018. There has been no impairment of intangible assets to date. If intangible assets or additional renewable energy facilities are impaired based on a future impairment test, we could be required to record further non-cash impairment charges to our operating income. Such non-cash impairment charges, if significant, could materially and adversely affect our results of operations in the period recognized.
Goodwill is reviewed for impairment at least annually and whenever facts and circumstances indicate that it is more-likely-than-not that the fair value of a reporting unit that has goodwill is less than its carrying value. An impairment loss is recognized if the fair value of a reporting unit exceeds its carrying value. As of December 1, 2018, we performed a qualitative impairment test for the goodwill balance in Saeta of $120.6 million and determined that it is more-likely-than-not that the fair values of the reporting units exceed their carrying amounts. We concluded that further evaluation of impairment was not necessary and goodwill associated with the Saeta acquisition was not impaired at December 31, 2018.
Risks Related to our Relationship with Brookfield
We may not realize the expected benefits of Brookfield sponsorship.
Following the transition to Brookfield sponsorship, we may not perform as we expect, or as the market expects, which could have an adverse effect on the price of our Class A common stock. The Company and Brookfield are party to certain sponsorship agreements, which include, among other things, for Brookfield to provide strategic and investment management services to us, for Brookfield, subject to certain terms and conditions, to provide us with a right of first offer on certain operating wind and solar assets that are located in North America and Western Europe and developed by persons sponsored by or under the control of Brookfield and for Brookfield to provide TerraForm Power with a $500 million secured revolving credit facility to fund certain acquisitions or growth capital expenditures.
We may not realize expected benefits of Brookfield’s management services and the other aspects of the sponsorship arrangements. For example, we may fail to realize expected operational or margin improvements, synergies or other cost savings or reductions, may not achieve expected growth in its portfolio through organic growth or third-party acquisitions and may not be able to acquire assets from Brookfield. We may also not be able to effectively utilize the $500 million revolving credit facility provided by Brookfield for accretive acquisitions or at all. Our failure to realize these aspects of Brookfield sponsorship may have an adverse effect on the price of our Class A common stock and on our business, growth and the results of our operations.