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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
For cash and cash equivalents, funds deposited by counterparties, restricted cash, accounts and other receivables, accounts payable, and cash collateral paid and received in support of energy risk management activities, the carrying amounts approximate fair values because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.
The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows:
March 31, 2021December 31, 2020
(In millions)Carrying AmountFair ValueCarrying AmountFair Value
Assets:    
Notes receivable
$$$$
Liabilities:
Long-term debt, including current portion (a)
9,609 10,007 8,781 9,446 
(a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt in the Company's consolidated balance sheets
The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The estimated fair value of the borrowing under the Revolving Credit Facility and Receivable Securitization Facilities approximates the carrying value because the interest rates vary with market interest rates, and is classified as Level 3 within the fair value hierarchy. The fair value of certain notes receivable of the Company is based on expected future cash flows discounted at market interest rate and is classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion, as of March 31, 2021 and December 31, 2020:
March 31, 2021December 31, 2020
(In millions)Level 2Level 3Level 2Level 3
Long-term debt, including current portion$9,182 $825 $9,446 $— 

Recurring Fair Value Measurements
Debt securities, equity securities, and trust fund investments, which are comprised of various U.S. debt and equity securities, and derivative assets and liabilities, are carried at fair market value.
The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:
March 31, 2021
(In millions)TotalLevel 1Level 2Level 3
Investments in securities (classified within other current and non-current assets)
$24 $10 $14 $— 
Nuclear trust fund investments: 
Cash and cash equivalents20 20 — — 
U.S. government and federal agency obligations73 72 — 
Federal agency mortgage-backed securities78 — 78 — 
Commercial mortgage-backed securities40 — 40 — 
Corporate debt securities136 — 136 — 
Equity securities466 466 — — 
Foreign government fixed income securities— 
Other trust fund investments:
U.S. government and federal agency obligations— — 
Derivative assets: 
Commodity contracts2,824 195 2,365 264 
Measured using net asset value practical expedient:
Equity securities — nuclear trust fund investments89 
       Equity securities
Total assets$3,766 $765 $2,640 $264 
Derivative liabilities: 
Foreign exchange contracts$$— $$— 
Commodity contracts2,438 205 2,128 105 
Total liabilities$2,440 $205 $2,130 $105 
December 31, 2020
(In millions)TotalLevel 1Level 2Level 3
Investments in securities (classified within other current and non-current assets)
$25 $10 $15 $— 
Nuclear trust fund investments:
Cash and cash equivalents23 23 — — 
U.S. government and federal agency obligations70 69 — 
Federal agency mortgage-backed securities89 — 89 — 
Commercial mortgage-backed securities36 — 36 — 
Corporate debt securities144 — 144 — 
Equity securities434 434 — — 
Foreign government fixed income securities— 
Other trust fund investments:
U.S. government and federal agency obligations— — 
Derivative assets: 
Commodity contracts821 59 623 139 
Measured using net asset value practical expedient:
Equity securities — nuclear trust fund investments87 
       Equity securities
Total assets$1,745 $597 $914 $139 
Derivative liabilities: 
Commodity contracts$884 $86 $643 $155 
Total liabilities$884 $86 $643 $155 

The following table reconciles, for the three months ended March 31, 2021 and 2020, the beginning and ending balances for financial instruments that are recognized at fair value in the condensed consolidated financial statements, using significant unobservable inputs:
Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
Three months ended March 31, 2021Three months ended March 31, 2020
(In millions)
Derivatives(a)
Derivatives(a)
Beginning balance $(16)$38 
Contracts added from Direct Energy acquisition
(15)— 
    Total gains realized/unrealized— included in earnings
180 22 
Purchases20 
Transfers into Level 3(b)
Transfers out of Level 3(b)
(14)(3)
Ending balance$159 $73 
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end
$146 $(9)
(a)Consists of derivative assets and liabilities, net
(b)Transfers into/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2

Derivative Fair Value Measurements
A portion of NRG's contracts are exchange-traded contracts with readily available quoted market prices. A majority of NRG's contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available. These contracts are valued based on various valuation techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of the observable market data with similar characteristics. As of March 31, 2021, contracts valued with prices provided by models and other valuation techniques make up 9% of derivative assets and 4% of derivative liabilities.
NRG's significant positions classified as Level 3 include physical and financial natural gas and power contracts executed in illiquid markets, as well as FTRs. The significant unobservable inputs used in developing fair value include illiquid natural gas and power location pricing, which is derived as a basis to liquid locations. The basis spread is based on observable market
data when available or derived from historic prices and forward market prices from similar observable markets when not available. For FTRs, NRG uses the most recent auction prices to derive the fair value.
The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of March 31, 2021 and December 31, 2020:
March 31, 2021
Fair ValueInput/Range
(In millions)AssetsLiabilitiesValuation TechniqueSignificant Unobservable InputLowHighWeighted Average
Natural Gas Contracts$$— Discounted Cash FlowForward Market Price (per MMBtu)$$16 $14 
Power Contracts234 91 Discounted Cash FlowForward Market Price (per MWh)237 29 
FTRs27 14 Discounted Cash FlowAuction Prices (per MWh)(33)320 0
$264 $105 

December 31, 2020
Fair ValueInput/Range
(In millions)AssetsLiabilitiesValuation TechniqueSignificant Unobservable InputLowHighWeighted Average
Power Contracts$111 $143 Discounted Cash FlowForward Market Price (per MWh)$10 $105 $21 
FTRs28 12 Discounted Cash FlowAuction Prices (per MWh)(28)43 0
$139 $155 

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of March 31, 2021 and December 31, 2020:
Significant Unobservable InputPositionChange In InputImpact on Fair Value Measurement
Forward Market Price Natural Gas/PowerBuyIncrease/(Decrease)Higher/(Lower)
Forward Market Price Natural Gas/PowerSellIncrease/(Decrease)Lower/(Higher)
FTR PricesBuyIncrease/(Decrease)Higher/(Lower)
FTR PricesSellIncrease/(Decrease)Lower/(Higher)
The fair value of each contract is discounted using a risk-free interest rate. In addition, the Company applies a credit reserve to reflect credit risk, which is calculated based on published default probabilities. As of March 31, 2021, the credit reserve resulted in a $14 million decrease primarily within cost of operations. As of December 31, 2020, the credit reserve resulted in a $2 million increase primarily within cost of operations.
Concentration of Credit Risk
In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Company's 2020 Form 10-K, the following is a discussion of the concentration of credit risk for the Company's contractual obligations. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. NRG is exposed to counterparty credit risk through various activities including wholesale sales, fuel purchases and retail supply arrangements, as well as retail customer credit risk through its retail load activities.
Counterparty Credit Risk
The Company's counterparty credit risk policies are disclosed in its 2020 Form 10-K. As of March 31, 2021, counterparty credit exposure, excluding credit exposure from RTOs, ISOs, registered commodity exchanges and certain long-term agreements, was $811 million and NRG held collateral (cash and letters of credit) against those positions of $140 million, resulting in a net exposure of $752 million. NRG periodically receives collateral from counterparties in excess of their exposure. Collateral amounts shown include such excess while net exposure shown excludes excess collateral received.
Approximately 43% of the Company's exposure before collateral is expected to roll off by the end of 2022. Counterparty credit exposure is valued through observable market quotes and discounted at a risk free interest rate. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables.
 
Net Exposure(a)(b)
Category by Industry Sector(% of Total)
Utilities, energy merchants, marketers and other79 %
Financial institutions21 
Total as of March 31, 2021100 %
 
Net Exposure (a)(b)
Category by Counterparty Credit Quality(% of Total)
Investment grade61 %
Non-investment grade/non-rated39 
Total as of March 31, 2021100 %
(a)Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices
(b)The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long-term contracts
The Company currently has no exposure to wholesale counterparties in excess of 10% of total net exposure discussed above as of March 31, 2021. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration.
During Winter Storm Uri, the Company experienced nonperformance by a counterparty in one of its bilateral financial hedging transactions, resulting in exposure of $393 million. The Company is pursuing all means available to enforce its obligations under this transaction but, given the size of the exposure, cannot determine with certainty what the amount of its ultimate recovery will be. The full exposure was recorded as a provision for credit losses as of March 31, 2021.
RTOs and ISOs
The Company participates in the organized markets of CAISO, ERCOT, AESO, IESO, ISO-NE, MISO, NYISO and PJM, known as RTOs or ISOs. Trading in the majority of these markets is approved by FERC, whereas in the case of ERCOT, it is approved by the PUCT, and whereas in the case of AESO and IESO, both exist provincially with AESO primarily subject to Alberta Utilities Commission and the IESO to the Ontario Energy Board. These ISOs may include credit policies that, under certain circumstances, require that losses arising from the default of one member on spot market transactions be shared by the remaining participants. As a result, the counterparty credit risk to these markets is limited to NRG’s share of the overall market and are excluded from the above exposures.
Exchange Traded Transactions
The Company enters into commodity transactions on registered exchanges, notably ICE, NYMEX and Nodal. These clearinghouses act as the counterparty and transactions are subject to extensive collateral and margining requirements. As a result, these commodity transactions have limited counterparty credit risk.
Long-Term Contracts
Counterparty credit exposure described above excludes credit risk exposure under certain long-term contracts, primarily solar PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company values these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of March 31, 2021, aggregate credit risk exposure managed by NRG to these counterparties was approximately $925 million for the next five years.
Retail Customer Credit Risk
The Company is exposed to retail credit risk through the Company's retail electricity and gas providers, which serve Home and Business customers. Retail credit risk results in losses when a customer fails to pay for services rendered. The losses may result from both non-payment of customer accounts receivable and the loss of in-the-money forward value. The Company manages retail credit risk through the use of established credit policies that include monitoring of the portfolio and the use of credit mitigation measures such as deposits or prepayment arrangements.
As of March 31, 2021, the Company's retail customer credit exposure to Home and Business customers was diversified across many customers and various industries, as well as government entities. As a result of Winter Storm Uri, the Company incurred additional credit losses from Business customers primarily due to a segment of customers whose contracts included a pass through of wholesale power prices which were significantly escalated during the storm and from customers who failed to meet their obligations in ERCOT load curtailment programs.