X0306 4 2020-06-11 0 0001709682 NESCO HOLDINGS, INC. NSCO 0001707921 ECP ControlCo, LLC 40 BEECHWOOD ROAD SUMMIT NJ 07901 0 0 1 0 Restricted Stock Unit 2020-06-11 4 J 0 60000 0.00 A Common Stock 60000 60000 I See footnotes Stock Option 4.00 2020-06-11 4 J 0 80000 0.00 A 2030-06-11 Common Stock 80000 80000 I See footnotes Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. Represents securities held directly by Energy Capital Partners Management, LP ("ECP Management"). Each of Jennifer Gray, Rahman D'Argenio, Matthew Himler and Douglas Kimmelman have entered into an agreement with ECP Management pursuant to which each of the foregoing individuals has irrevocably assigned any and all compensation, including the equity awards reported herein, that he or she may receive from serving as a director of the Issuer to ECP Management. The award will vest in three equal, annual installments beginning on June 11, 2021. ECP ControlCo, LLC ("ECP ControlCo") is the sole member of ECP Management GP, LLC, which is the general partner of ECP Management. As a result, each of the foregoing entities may be deemed to share beneficial ownership of the securities held by ECP Management. The managing members of ECP ControlCo are Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. Each such individual disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. Each of ECP Management GP, LLC and Energy Capital Partners Management, LP are separately filing a Form 3 to report beneficial ownership of the securities reported herein. ECP ControlCo, LLC By: /s/ Rahman D'Argenio, Managing Member 2020-06-15