CONCENTRATIONS	9 Months Ended
Sep. 30, 2021
Risks and Uncertainties [Abstract]
Concentrations	14. CONCENTRATIONS The Company has one major power customer, NYISO, that accounted for 9% and 11% of its revenue for the three and nine months ended September 30, 2021, respectively, and 50% and 38% for the three and nine months ended September 30, 2020. 6% and 100% of accounts receivable were due from this customer at September 30, 2021 and December 31, 2020, respectively. For cryptocurrency mining, Greenidge considers its mining pool operators to be its customers. Greenidge has historically used a limited number of pool operators that have operated under contracts with a one-day term, which allows Greenidge the option to change pool operators at any time. Revenue from one of the Company’s pool operator customers accounted for approximately 62% and 37% of total revenue for the three and nine months ended September 30, 2021, respectively, and none of the revenue for the three and nine months ended September 30, 2020. Revenue from a different pool operator customer accounted for approximately 24% and 46% of total revenue for the three and nine months ended September 30, 2021, respectively, and approximately 50% and 59% of total revenue for the three and nine months ended September 30, 2020, respectively. The Support Services segment's largest and second largest customers accounted for approximately 60% and 25%, respectively, of the Company's consolidated accounts receivable balance at September 30, 2021.

CONCENTRATIONS

9 Months Ended

Sep. 30, 2021

14. CONCENTRATIONS

The Company has one major power customer, NYISO, that accounted for 9% and 11% of its revenue for the three and nine months ended September 30, 2021, respectively, and 50% and 38% for the three and nine months ended September 30, 2020. 6% and 100% of accounts receivable were due from this customer at September 30, 2021 and December 31, 2020, respectively.

For cryptocurrency mining, Greenidge considers its mining pool operators to be its customers. Greenidge has historically used a limited number of pool operators that have operated under contracts with a one-day term, which allows Greenidge the option to change pool operators at any time. Revenue from one of the Company’s pool operator customers accounted for approximately 62% and 37% of total revenue for the three and nine months ended September 30, 2021, respectively, and none of the revenue for the three and nine months ended September 30, 2020. Revenue from a different pool operator customer accounted for approximately 24% and 46% of total revenue for the three and nine months ended September 30, 2021, respectively, and approximately 50% and 59% of total revenue for the three and nine months ended September 30, 2020, respectively.

The Support Services segment's largest and second largest customers accounted for approximately 60% and 25%, respectively, of the Company's consolidated accounts receivable balance at September 30, 2021.