Long-Term Debt and Financing Obligations Outstanding Balance (Details)
$ in Thousands

In 2010, the Company and RGRT, a Texas grantor trust through which the Company finances its portion of fuel for Palo Verde, entered into a note purchase agreement with various institutional purchasers. Under the terms of the agreement, RGRT issued and sold to the purchasers $110.0 million aggregate principal amount of Senior Notes ("RGRT Notes"). In August 2015 and 2017, $15.0 million and $50.0 million of the RGRT Notes, respectively, matured and were paid with borrowings from the RCF. The Company guarantees the payment of principal and interest on the RGRT Notes. In the Company’s financial statements, the assets and liabilities of RGRT are reported as assets and liabilities of the Company. In August 2020, the remaining $45.0 million of these RGRT Notes mature.

The sale of the RGRT Notes was made by RGRT in reliance on a private placement exemption from registration under the Securities Act. The proceeds of $109.4 million, net of issuance costs, from the sale of the RGRT Notes was used by RGRT to repay amounts borrowed under the RCF and enabled future nuclear fuel financing requirements of RGRT to be met with a combination of the RGRT Notes and amounts borrowed from the RCF.

On June 28, 2018, the RGRT and the Company entered into a note purchase agreement with several institutional purchasers under which the RGRT issued and sold $65.0 million aggregate principal amount of 4.07% Senior Guaranteed Notes due August 15, 2025 ("RGRT Senior Notes"). The net proceeds from the RGRT Senior Notes were used to repay outstanding short-term borrowings under the RCF to finance nuclear fuel purchases. The Company guaranteed the payment of principal and interest on the RGRT Senior Notes. RGRT’s assets, liabilities and operations are consolidated in the Company’s financial statements and the RGRT Senior Notes are included as long-term debt on the balance sheet. The issuance and sale of the RGRT Senior Notes was made in reliance on a private placement exemption from the registration provisions of the Securities Act.

RGRT pays interest on the senior notes above on February 15 and August 15 of each year until maturity, beginning on February 15, 2019. RGRT may redeem the senior notes, in whole or in part, at any time at a redemption price equal to 100% of the principal amount to be redeemed together with the interest on such principal amount accrued to the date of redemption, plus a make-whole amount based on the prevailing market interest rates.

Pollution Control Bonds

The Company has three series of tax exempt unsecured PCBs in aggregate principal amount of $159.8 million as of December 31, 2019. The 2009 Series A 7.25% and the 2009 Series B 7.25% PCBs with an aggregate principal amount, together, of $100.6 million had optional redemptions beginning in February 2019 and April 2019, respectively. The principal and related unamortized issuance cost on these PCBs were classified as current maturities of long-term debt as of December 31, 2018.

The Company purchased in lieu of redemption all of the 2009 Series A 7.25% PCBs with an aggregate principal amount of $63.5 million, and all of the 2009 Series B 7.25% PCBs with an aggregate principal amount of $37.1 million, on February 1, 2019 and April 1, 2019, respectively, utilizing funds borrowed under the RCF.

On May 22, 2019, the Company reoffered and sold $63.5 million aggregate principal amount of 2009 Series A 7.25% PCBs and $37.1 million aggregate principal amount of 2009 Series B 7.25% PCBs with a fixed interest rate of 3.60% per annum

until the PCBs mature on February 1, 2040 and April 1, 2040, respectively. The PCBs are subject to optional redemption at a redemption price of par on or after June 1, 2029. Proceeds from the remarketing of the PCBs were primarily used to repay outstanding short-term borrowings under the RCF.

The Senior Notes are unsecured obligations of the Company. They were issued pursuant to bond covenants that provide limitations on the Company’s ability to enter into certain transactions. The 6.00% Senior Notes have an aggregate principal amount of $400.0 million and were issued in May 2005. The proceeds, net of a $2.3 million discount, were used to fund the retirement of the Company's first mortgage bonds. The Company amortizes the loss associated with a cash flow hedge recorded in AOCI to earnings as interest expense over the life of the 6.00% Senior Notes. See Part II, Item 8, Financial Statements and Supplementary Data, Note Q of Notes to Financial Statements. This amortization is included in the effective interest rate of the 6.00% Senior Notes.

The 7.50% Senior Notes have an aggregate principal amount of $150.0 million and were issued in June 2008. The proceeds, net of a $1.3 million discount, were used to repay outstanding short-term borrowings of $44.0 million, fund capital expenditures and for other general corporate purposes.

The 3.30% Senior Notes have an aggregate principal amount of $150.0 million were issued in December 2012. The proceeds, net of a $0.3 million discount, were used to repay outstanding short-term borrowings, fund construction expenditures and for working capital and general corporate purposes.

In December 2014, the Company issued 5.00% Senior Notes with an aggregate principal amount of $150.0 million. The proceeds, net of a $0.5 million discount, were used to fund construction expenditures and for working capital and general corporate purposes. In March 2016, the Company issued additional 5.00% Senior Notes with an aggregate principal amount of $150.0 million. The proceeds from this issuance, after deducting the underwriters' commission, were $158.1 million. These proceeds included accrued interest of $2.4 million and a $7.1 million premium before expenses. The net proceeds from the sale of these senior notes were used to repay outstanding short-term borrowings under the RCF. After the March 2016 issuance, the Company's 5.00% Senior Notes due 2044 had a total principal amount outstanding of $300.0 million.

On June 28, 2018, the Company entered into a note purchase agreement with several institutional purchasers under which the Company issued and sold $125.0 million aggregate principal amount of 4.22% Senior Notes due August 15, 2028. The net proceeds from the issuance of these senior notes were used to repay outstanding short-term borrowings under the RCF for working capital and general corporate purposes. The Company pays interest on the notes semi-annually on February 15 and August 15 of each year until maturity, beginning on February 15, 2019. The Company may redeem the notes, in whole or in part, at any time at a redemption price equal to 100% of the principal amount to be redeemed together with the interest on such principal amount accrued to the date of redemption, plus a make-whole amount based on the prevailing market interest rates. The issuance and sale of these senior notes was made in reliance on a private placement exemption from the registration provisions of the Securities Act of 1933, as amended (the "Securities Act").

Revolving Credit Facility

On January 14, 2014, the Company and RGRT entered into a second amended and restated credit agreement related to the RCF with JP Morgan Chase Bank, N.A., as administrative agent and issuing bank, and Union Bank, N.A., as syndication agent, and various lending banks party thereto. As of December 31, 2016, the Company had available $300.0 million and the ability to increase the RCF by up to $100.0 million with a term ending January 2019. On January 9, 2017, the Company exercised its option to extend the maturity of the RCF by one year to January 14, 2020 and to increase the size of the facility by $50.0 million to $350.0 million.

On September 13, 2018, the Company and The Bank of New York Mellon Trust Company, N.A., as trustee of the RGRT, entered into a third amended and restated credit agreement ("RCF Agreement") with MUFG Union Bank, N.A., as administrative agent and as syndication agent, various issuing banks and lending banks party thereto. Under the terms of the RCF Agreement, the Company has available a $350.0 million RCF with a $50.0 million subfacility for the issuance of letters of credit, and the Company extended the term of the Company's existing $350.0 million revolving credit agreement from January 14, 2020 to September 13, 2023 ("Maturity Date"). The Company may increase the RCF by up to $50.0 million (to a total of $400.0 million) during the term of the RCF Agreement, upon the satisfaction of certain conditions more fully set forth in the RCF Agreement, including obtaining commitments from lenders or third party financial institutions. In addition, the Company may extend the Maturity Date up to two times, in each case for an additional one year period, upon the satisfaction of certain conditions more fully set forth in the RCF Agreement, including requisite lender approval.

The RCF Agreement provides that amounts borrowed by the Company may be used for, among other things, working capital

and general corporate purposes. Any amounts borrowed by the RGRT may be used, among other things, to finance the acquisition and cost to process nuclear fuel. Amounts borrowed by the RGRT are guaranteed by the Company and the balance borrowed under the RCF Agreement is recorded as short-term borrowings on the balance sheet. The RCF Agreement is unsecured. In August 2017, $50.0 million aggregate principal amount of Series B 4.47% Senior Notes of the RGRT matured and was paid with borrowings from the RCF. On February 1, 2019 and April 1, 2019, respectively, the Company purchased in lieu of redemption all of the 2009 Series A 7.25% PCBs with a principal amount of $63.5 million and 2009 Series B 7.25% PCBs with a principal amount of $37.1 million, utilizing funds borrowed under the RCF. On May 22, 2019, the Company reoffered and sold $63.5 million aggregate principal amount of 2009 Series A 7.25% PCBs and $37.1 million aggregate principal amount of 2009 Series B 7.25% PCBs. The proceeds from the remarketing of the PCBs were principally used to repay outstanding short-term borrowings under the RCF. As of December 31, 2019, the total amount borrowed by the RGRT was $29.8 million for nuclear fuel under the RCF. As of December 31, 2019, $84.0 million of borrowings were outstanding under this facility for working capital and general corporate purposes. The weighted average interest rate on the RCF was 3.0% as of December 31, 2019, with an additional $236.0 million available to borrow.

The Merger would constitute a "Change in Control" under the RCF and the consummation of the Merger would result in an event of default under the RCF. On and subject to the terms and conditions of the Merger Agreement, the Company requested that the lenders under the RCF consent to the Merger and waive any default or event of default that would occur as a result of the Merger. On August 9, 2019, the lenders agreed to such consent and waiver.

Under the Merger Agreement, subject to certain exceptions, the Company cannot incur additional indebtedness over $200.0 million (excluding borrowings up to the existing borrowing capacity of the RCF), without the prior written consent of Parent.