Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 12, 2021
Document Information [Line Items]
Entity Registrant Name	Greenidge Generation Holdings Inc.
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Fiscal Year Focus	2021
Document Period End Date	Sep. 30, 2021
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001844971
Document Transition Report	false
Entity File Number	001-40808
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-1746728
Entity Address, Address Line One	590 Plant Road
Entity Address, City or Town	Dresden
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14441
City Area Code	315
Local Phone Number	536-2359
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	false
Entity Ex Transition Period	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	GREE
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		11,605,205
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		29,040,000
8.50% Senior Notes due 2026 [Member]
Document Information [Line Items]
Title of 12(b) Security	8.50% Senior Notes due 2026
Trading Symbol	GREEL
Security Exchange Name	NASDAQ