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Asset retirement obligations
3 Months Ended
Mar. 31, 2022
Asset retirement obligations  
Asset retirement obligations

Note 8 – Asset Retirement Obligations

Asset retirement obligations represent the present value of the estimated costs to remove the commercial charging stations and restore the sites to the condition prior to installation. The Company reviews estimates of removal costs on an ongoing basis. Accretion expense was $0.5 million and $0.3 million for the three months ended March 31, 2022 and 2021, respectively. Asset retirement obligation activity for the three months ended March 31, 2022 was as follows:

    

March 31, 

(in thousands)

2022

Beginning balance

$

12,833

Liabilities incurred

 

1,001

Accretion expense

 

459

Liabilities settled

 

(219)

Ending balance

$

14,074