Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 16, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0001296445
Entity Registrant Name	ORMAT TECHNOLOGIES, INC.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-32347
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-0326081
Entity Address, Address Line One	6140 Plumas Street
Entity Address, City or Town	Reno
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89519-6075
City Area Code	775
Local Phone Number	356-9029
Title of 12(b) Security	Common Stock $0.001 Par Value
Trading Symbol	ORA
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3,126,510,918
Entity Common Stock, Shares Outstanding		56,056,450
Auditor Name	Kesselman & Kesselman
Auditor Location	Tel Aviv, Israel
Auditor Firm ID	1309
ICFR Auditor Attestation Flag	true