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Contractual Obligations.  Our contractual obligations as of December 31, 2019 are as follows (in thousands): 

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(1) We have five outstanding issuances of senior notes. In May 2005, we issued $400.0 million aggregate principal amount of 6% Senior Notes due May 15, 2035. In June 2008, we issued $150.0 million aggregate principal amount of 7.5% Senior Notes due March 15, 2038. In December 2012, we issued $150.0 million aggregate principal amount of 3.3% Senior Notes due December 15, 2022. In December 2014, we issued $150.0 million aggregate principal amount of 5.0% Senior Notes due December 1, 2044. In March 2016, we issued an additional $150.0 million aggregate principal amount of 5.0% Senior Notes due December 1, 2044, for a total principal amount outstanding of 5.0% Senior Notes due December 1, 2044 of $300.0 million. In June 2018, we issued in a private placement offering $125.0 million aggregate principal amount of 4.22% Senior Notes due August 15, 2028. 

(2) We have three series of PCBs outstanding, two of which mature in 2040, and one of which matures in 2042. On February 1, 2019 and April 1, 2019, the Company purchased in lieu of redemption the 2009 Series A 7.25% PCBs with an aggregate principal amount of $63.5 million and the 2009 Series B 7.25% PCBs with an aggregate principal amount of $37.1 million, 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. These two bonds are subject to optional redemption at a redemption price of par on or after June 1, 2029. 

(3) In 2010, we and RGRT entered into a note purchase agreement pursuant to which the RGRT issued and sold $45.0 million aggregate principal amount of 5.04% RGRT Senior Notes, Series C, due August 15, 2020. In June 2018, we and RGRT entered into a note purchase agreement pursuant to which the RGRT issued and sold $65.0 million aggregate principal amount of 4.07% Senior Guaranteed Notes due August 15, 2025. 

(4) This reflects obligations outstanding under the $350.0 million RCF. At December 31, 2019, $84.0 million was borrowed for working capital and general corporate purposes and $29.8 million was borrowed by RGRT for nuclear fuel. This balance includes interest based on actual interest rates at the end of 2019 and assumes this amount will be outstanding for the entire year of 2020. 

(5) Amount is based on the minimum volumes per the contract and market and/or contract price at the end of 2019. Gas obligation includes a gas storage contract and a gas transportation contract. 

(6) Some of the nuclear fuel contracts are based on a fixed price, adjusted for a market index. The index used here is the index at the end of 2019. 

(7) At December 31, 2019, the Company met the minimum pension funding levels required under the Employee Retirement Income Security Act of 1974. We also may decide to fund at higher levels and expect to contribute $10.0 million to our retirement plans in 2020. Minimum funding requirements for 2021 and beyond are not included due to the uncertainty of the applicable interest rates and the related return on assets. 

