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

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	December 31,
	2022			2021
	(Dollars in thousands)
Limited and non-recourse agreements (1):
Limited recourse:
Loan agreement with DFC (the Olkaria III power plant)	$	138,663		$	156,657
Loan agreement with DFC (the Platanares power plant)	$	79,880			88,073
Loan agreement with Banco Industrial S.A. and Westrust Bank (International) Limited	$	15,750			19,250
Loan agreement with a global industrial company (the Plumstriker battery energy storage projects)	$	11,392			14,726
Loans assumed in the purchase of USG	$	119,392			79,064
Other loans	$	4,585			5,930
OFC 2 Senior Secured Notes	$	158,036			173,321
Non-recourse:
DAC 1 Senior Secured Notes	$	62,698			67,939
Other loans	$	5,805			7,697
Total limited and non-recourse agreements	$	596,201			612,657
Less current portion	$	(64,044	)		(61,695	)
Noncurrent portion	$	532,157		$	550,962
Full recourse agreements (1):
Senior Unsecured Bonds (Series 3 and Series 4)	$	255,754		$	539,567
Senior Unsecured Loan (Migdal)	$	174,800			191,600
Hapoalim, Mizrahi, HSBC and Discount loans	$	298,884			266,071
Loan agreements with DEG (the Olkaria III and power plants 4 and 1 upgrade)	$	51,528			60,896
Total full recourse agreements	$	780,966			1,058,134
Less current portion	$	(101,460	)		(313,846	)
Noncurrent portion	$	679,506		$	744,288
Convertible senior notes (all noncurrent) (1)	$	431,250		$	—
Financing liability	$	242,029		$	252,864
Less current portion	$	(16,270	)	$	(10,835	)
Noncurrent portion	$	225,759		$	242,029

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Mizrahi Loan	$	75.0	$	70.3		4.10	%	April 2030

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Hapoalim Loan	$	125.0	$	98.2		3.45	%	June 2028

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
HSBC Loan	$	50.0	$	42.9		3.45	%	July 2028

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Discount Loan	$	100.0	$	87.5		2.9	%	September 2029

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Senior Unsecured Bonds - Series 4	$	289.8	$	255.8		3.35	%	June 2031

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Migdal Loan	$	100.0	$	87.4		4.80	%	March 2029
Additional Migdal Loan		50.0		43.7		4.60	%	March 2029
Second Addendum Migdal Loan		50.0		43.7		5.44	%	March 2029
Total Senior Unsecured Loan	$	200.0	$	174.8

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
DEG 2 Loan	$	50.0	$	27.5		6.28	%	June 2028
DEG 3 Loan		41.5		24.0		6.04	%	June 2028
	$	91.5	$	51.5

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
OPIC Loan - Tranche I	$	85.0	$	37.8		6.34	%	December 2030
OPIC Loan - Tranche II		180.0		79.4		6.29	%	June 2030
OPIC Loan - Tranche III		45.0		21.5		6.12	%	December 2030
Total OPIC Loan	$	310.0	$	138.7

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
DFC - Platanares Loan	$	114.7	$	79.9		7.02	%	September 2032

	Amount		Amount Outstanding as of		Annual	Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)	Date
	(Dollars in millions)
Amatitlan Loan	$	42.0	$	15.8	LIBOR+4.35%	June 2027

	Amount		Amount Outstanding as of		Annual	Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)	Date
	(Dollars in millions)
Plumstriker Loan	$	23.5	$	11.4	LIBOR+3.5%	May 2026

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
DAC 1 Senior Secured Notes	$	92.5	$	62.7		4.03	%	September 2033

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
OFC 2 Senior Secured Notes - Series A	$	151.7	$	71.8		4.69	%	December 2032
OFC 2 Senior Secured Notes - Series C		140.0		86.3		4.61	%	December 2032
Total OFC 2 Senior Secured Notes	$	291.7	$	158.1

	Amount		Amount Outstanding as of		Annual			Maturity
Loan	Issued		December 31, 2022		Interest Rate (1)			Date
	(Dollars in millions)
Idaho Refinancing Note	$	61.6	$	61.6		6.26	%	March 2038
U.S. Department of Energy		96.8		32.8		2.60	%	February 2035
Prudential Capital Group – Nevada		30.7		25.0		6.75	%	December 2037
Total	$	189.1	$	119.4

	Amount Outstanding as of		Annual			Maturity
Loan	December 31, 2022		Interest Rate (1)			Date (2)
	(Dollar in millions)
Financing Liability - Dixie Valley	$	242.0		2.55	%	March 2033

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

	(Dollars in thousands)
Year ending December 31:
2023	$	181,660
2024		261,622
2025		176,309
2026		177,539
2027		605,013
Thereafter		650,458
Total	$	2,052,601