|NRG ENERGY, INC. filed this Form 10-K on 03/01/2018|
The following table presents NRG's amortization of intangible assets for each of the past three years:
The following table presents estimated amortization of NRG's intangible assets for each of the next five years:
Intangible assets held for sale — From time to time, management may authorize the transfer from the Company's emission bank of emission allowances held-for-use to intangible assets held-for-sale. Emission allowances held-for-sale are included in other non-current assets on the Company's consolidated balance sheet and are not amortized, but rather expensed as sold. As of December 31, 2017, the value of emission allowances held-for-sale is $9 million and is managed within the Corporate segment. Once transferred to held-for-sale, these emission allowances are prohibited from moving back to held-for-use.
Out-of-market contracts — Due primarily to business acquisitions, NRG acquired certain out-of-market contracts, which are classified as non-current liabilities on NRG's consolidated balance sheet. These include out-of-market lease contracts of $159 million acquired in the acquisition of EME. These out-of-market contracts are amortized to cost of operations. As of December 31, 2017 and 2016, the Company had accumulated amortization for out-of-market contracts of $358 million and $457 million, respectively.
The following table summarizes the estimated amortization related to NRG's out-of-market contracts: