XML 51 R38.htm IDEA: XBRL DOCUMENT v3.20.2
Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Fair value of APS's nuclear decommissioning trust fund assets
The following tables present the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS's Nuclear Decommissioning Trusts and other special use fund assets (dollars in thousands):  
September 30, 2020
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$570,382 $8,090 $578,472 $359,112 $(36)
Available for sale-fixed income securities513,603 258,758 772,361 (a)47,158 (674)
Other(14,148)1,444 (12,704)(b)— — 
Total$1,069,837 $268,292 $1,338,129 $406,270 $(710)

(a)As of September 30, 2020, the amortized cost basis of these available-for-sale investments is $726 million.
(b)Represents net pending securities sales and purchases.
December 31, 2019
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$529,716 $7,142 $536,858 $337,681 $— 
Available for sale-fixed income securities478,658 237,479 716,137 (a)25,795 (669)
Other2,401 474 2,875 (b)— — 
Total$1,010,775 $245,095 $1,255,870 $363,476 $(669)

(a)As of December 31, 2019, the amortized cost basis of these available-for-sale investments is $691 million.
(b)Represents net pending securities sales and purchases.
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
The following tables set forth APS's realized gains and losses relating to the sale and maturity of available-for-sale debt securities and equity securities, and the proceeds from the sale and maturity of these investment securities (dollars in thousands):
 Three Months Ended September 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2020
Realized gains$2,933 $— $2,933 
Realized losses(750)(15)(765)
Proceeds from the sale of securities (a)178,919 37,107 216,026 
2019
Realized gains$4,732 $4 $4,736 
Realized losses(2,360)— (2,360)
Proceeds from the sale of securities (a)155,386 56,255 211,641 

(a)    Proceeds are reinvested in the Nuclear Decommissioning Trusts and other special use funds, excluding amounts reimbursed to the Company for active union employee medical claims from the active union employee medical account.
 Nine Months Ended September 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2020
Realized gains$10,746 $— $10,746 
Realized losses(4,598)(15)(4,613)
Proceeds from the sale of securities (a)534,057 73,828 607,885 
2019
Realized gains$8,478 $4 $8,482 
Realized losses(5,465)— (5,465)
Proceeds from the sale of securities (a)371,538 149,458 520,996 

(a)    Proceeds are reinvested in the Nuclear Decommissioning Trusts and other special use funds, excluding amounts reimbursed to the Company for active union employee medical claims from the active union employee medical account.
Fair value of fixed income securities, summarized by contractual maturities
The fair value of APS's fixed income securities, summarized by contractual maturities, at September 30, 2020, is as follows (dollars in thousands):
 Nuclear Decommissioning TrustCoal Mine Reclamation Escrow AccountActive Union Employee Medical AccountTotal
Less than one year$23,079 $34,578 $40,506 $98,163 
1 year – 5 years146,885 29,041 142,938 318,864 
5 years – 10 years122,619 2,772 — 125,391 
Greater than 10 years221,020 8,923 — 229,943 
Total$513,603 $75,314 $183,444 $772,361