As of June 30, 2020, prepaid expenses and other current assets primarily consisted of alternative fuel credits of $199,069. As of December 31, 2019, alternative fuel credits were $476,992.

As of June 30, 2020 and December 31, 2019, the Company had a remaining purchase commitment of $3,599,503 and $3,156,629, respectively, which will become payable upon the supplier’s delivery of the charging stations. The purchase commitments were made primarily for future sales and deployments of these charging stations.