Note 12 - Long-term Debt, Credit Agreements and Finance Liability (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Long-term Debt Instruments [Table Text Block]

	December 31,
	2021			2020
	(Dollars in thousands)
Limited and non-recourse agreements:
Limited recourse:
Loan agreement with DFC (the Olkaria III power plant)	$	156,657		$	174,652
Loan agreement with DFC (the Platanares power plant)		88,073			96,266
Loan agreement with Banco Industrial S.A. and Westrust Bank (International) Limited		19,250			22,750
Loan agreement with a global industrial company (the Plumstriker battery energy storage projects)		14,726			18,081
Other loans (assumed in the purchase of USG)		79,064			84,118
Other loans		5,930			7,807
OFC 2 Senior Secured Notes		173,321			188,223
Non-recourse:
DAC 1 Senior Secured Notes		67,939			73,121
Other loans		7,697			9,838
Total limited and non-recourse agreements		612,657			674,856
Less current portion		(61,695	)		(60,846	)
Noncurrent portion	$	550,962		$	614,010
Full recourse agreements:
Senior Unsecured Bonds (Series 3 and Series 4)	$	539,567		$	529,066
Senior Unsecured Loan (Migdal)		191,600			200,000
Hapoalim, HSBC and Discount loans		266,071			—
Loan agreements with DEG (the Olkaria III and power plants 4 and 1 upgrade)		60,896			70,264
Revolving credit lines with banks		—			—
Total full recourse agreements		1,058,134			799,330
Less current portion		(313,846	)		(17,768	)
Noncurrent portion	$	744,288		$	781,562

	Amount		Amount Outstanding as of		Annual		Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)		Date
	(Dollars in millions)
Hapoalim Loan		$125.0		$116.1		3.45%	June 2028

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
HSBC Loan	$	50.0	$	50.0		3.45	%	July 2028

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
Discount Loan	$	100.0	$	100.0		2.9	%	September 2029

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
Senior Unsecured Bonds - Series 4	$	289.8	$	321.5		3.35	%	June 2031

	Amount		Amount Outstanding as of		Annual		Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)		Date
	(Dollars in millions)
Senior Unsecured Bonds - Series 3		$218.0		$218.0		4.45%	September 2022

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
Migdal Loan	$	100.0	$	95.8		4.80	%	March 2029
Additional Migdal Loan		50.0		47.9		4.60	%	March 2029
Second Addendum Migdal Loan		50.0		47.9		5.44	%	March 2029
Total Senior Unsecured Loan	$	200.0	$	191.6

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
DEG 2 Loan	$	50.0	$	32.5		6.28	%	June 2028
DEG 3 Loan		41.5		28.4		6.04	%	June 2028
	$	91.5	$	60.9

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
OPIC Loan - Tranche I	$	85.0	$	42.5		6.34	%	December 2030
OPIC Loan - Tranche II		180.0		90.0		6.29	%	June 2030
OPIC Loan - Tranche III		45.0		24.2		6.12	%	December 2030
Total OPIC Loan	$	310.0	$	156.7

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
DFC - Platanares Loan	$	114.7	$	88.1		7.02	%	September 2032

	Amount		Amount Outstanding as of		Annual	Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)	Date
	(Dollars in millions)
Amatitlan Loan	$	42.0	$	19.3	LIBOR+4.35%	June 2027

	Amount		Amount Outstanding as of		Annual	Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)	Date
	(Dollars in millions)
Plumstriker Loan		$23.5		$14.7	LIBOR+3.5%	May 2026

	Amount		Amount Outstanding as of		Annual		Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)		Date
	(Dollars in millions)
DAC 1 Senior Secured Notes		$92.5		$67.9		4.03%	September 2033

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
OFC 2 Senior Secured Notes - Series A	$	151.7	$	79.6		4.69	%	December 2032
OFC 2 Senior Secured Notes - Series C		140.0		93.8		4.61	%	December 2032
Total OFC 2 Senior Secured Notes	$	291.7	$	173.4

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2021		Interest Rate (1)			Date
	(Dollars in millions)
Prudential Capital Group – Idaho non-recourse	$	20.0	$	16.8		5.80	%	March 2023
U.S. Department of Energy – non-recourse		96.8		39.0		2.60	%	February 2035
Prudential Capital Group – Nevada non-recourse		30.7		25.1		6.75	%	December 2037
Total	$	147.5	$	80.9

	Amount Outstanding as of		Annual			Maturity
Loan	December 31, 2021		Interest Rate (1)			Date (2)
	(Dollar in millions)
Financing Liability - Dixie Valley	$	252.9		2.55	%	March 2033

Schedule of Maturities of Long-term Debt [Table Text Block]

	(Dollars in thousands)
Year ending December 31:
2022	$	386,289
2023		189,103
2024		253,044
2025		167,193
2026		168,468
Thereafter		761,433
Total	$	1,925,530