CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Secured Long-term debt:
Total Secured Long-term debt	$ 9,726,428	$ 8,910,680
Unsecured debt:
Total Long-term debt	9,726,428	9,347,307
Obligations under finance leases	81,730
Obligations under finance leases		87,191
Obligation under Rocky Mountain transactions	25,196	21,428
Patronage capital and membership fees	1,016,747	962,286
Subtotal	10,850,101	10,418,212
Less: long-term debt and finance leases due within one year	(217,440)	(522,289)
Less: unamortized debt issuance costs	(100,680)	(92,377)
Less: unamortized bond discounts on long-term debt	(10,542)	(10,954)
Total capitalization	10,521,439	9,792,592
Commercial paper
Unsecured debt:
Commercial paper refinanced on a long-term basis	0	436,627
Federal Financing Bank (FFB) | First mortgage notes payable to the Federal Financing Bank at interest rates varying from 1.84% to 8.43% (average rate of 3.85% at December 31, 2019) due in quarterly installments through 2046
Secured Long-term debt:
Total Secured Long-term debt	2,526,867	2,577,699
Federal Financing Bank (FFB) | First mortgage notes payable to the Federal Financing Bank at interest rates varying from 2.51% to 3.87% (average rate of 3.37% at December 31, 2019) due in quarterly installments through 2044
Secured Long-term debt:
Total Secured Long-term debt	3,013,348	1,794,723
National Rural Utilities Cooperative Finance Corporation (CFC) | First mortgage notes payable to National Rural Utilities Cooperative Finance Corporation at interest rates varying from 4.75% to 4.90% (average rate of 4.79% at December 31, 2019) due in quarterly installments through 2020
Secured Long-term debt:
Total Secured Long-term debt	391	1,426
Public | First mortgage bonds payable: Series 2006 First Mortgage Bonds, 5.534%, due 2031 through 2035
Secured Long-term debt:
Total Secured Long-term debt	300,000	300,000
Public | First mortgage bonds payable: Series 2007 First Mortgage Bonds, 6.191%, due 2024 through 2031
Secured Long-term debt:
Total Secured Long-term debt	500,000	500,000
Public | First mortgage bonds payable: Series 2009A First Mortgage Bonds, 6.10%, due 2019
Secured Long-term debt:
Total Secured Long-term debt	0	350,000
Public | First mortgage bonds payable: Series 2009B First Mortgage Bonds, 5.95%, due 2039
Secured Long-term debt:
Total Secured Long-term debt	400,000	400,000
Public | First mortgage bonds payable: Series 2009 Clean renewable energy bond, 1.81%, due 2024
Secured Long-term debt:
Total Secured Long-term debt	5,052	6,062
Public | First mortgage bonds payable: Series 2010A First Mortgage Bonds, 5.375% due 2040
Secured Long-term debt:
Total Secured Long-term debt	450,000	450,000
Public | First mortgage bonds payable: Series 2011A First Mortgage Bonds, 5.25% due 2050
Secured Long-term debt:
Total Secured Long-term debt	300,000	300,000
Public | First mortgage bonds payable: Series 2012A First Mortgage Bonds, 4.20% due 2042
Secured Long-term debt:
Total Secured Long-term debt	250,000	250,000
Public | First mortgage bonds payable: Series 2014A First Mortgage Bonds, 4.55% due 2044
Secured Long-term debt:
Total Secured Long-term debt	250,000	250,000
Public | First mortgage bonds payable: Series 2016A First Mortgage Bonds, 4.25% due 2046
Secured Long-term debt:
Total Secured Long-term debt	250,000	250,000
Public | First Mortgage Bonds Payable: Series 2018A First Mortgage Bonds, 5.05% Due 2048
Secured Long-term debt:
Total Secured Long-term debt	500,000	500,000
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: 2009A Heard and Monroe, and 2009B Monroe, Weekly rate bonds, 1.80%, due 2030 through 2038
Secured Long-term debt:
Total Secured Long-term debt	112,055	112,055
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: 2010A Burke and Monroe, and 2010B Burke, Weekly rate bonds, 1.71% to 1.82%, due 2036 through 2037
Secured Long-term debt:
Total Secured Long-term debt	133,550	133,550
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: 2013A Appling, Burke and Monroe, Term rate bonds, 2.40% through April 1, 2020, due 2038 through 2040
Secured Long-term debt:
Total Secured Long-term debt	212,760	212,760
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: Series 2017 A Burke, Heard, Monroe and 2017B Burke, Indexed put bonds - weekly reset, 2.81% due 2040 through 2045
Secured Long-term debt:
Total Secured Long-term debt	122,620	122,620
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: Series 2017 C, D Burke, Remarketed in 2018 to fixed rate bonds, 4.125%, due 2041 through 2045
Secured Long-term debt:
Total Secured Long-term debt	200,000	200,000
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: Series 2017E Burke, Remarketed in 2018 to term rate bonds, 3.25% through February 3, 2025, due 2041 through 2045
Secured Long-term debt:
Total Secured Long-term debt	100,000	100,000
Georgia Development Authorities | First mortgage notes issued in connection with the sale of pollution control revenue bonds: Series 2017 F Burke, Remarketed in 2018 to term rate bonds, 3.00% through February 1, 2023, due 2041 through 2045
Secured Long-term debt:
Total Secured Long-term debt	$ 99,785	$ 99,785