Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We hereby consent to the use in the prospectus constituting a part of this Registration Statement on Form S-1 of our report dated April 23, 2021 (which includes an explanatory paragraph relating to Stem Inc. (f/k/a Star Peak Energy Transition Corp.) ability to continue as a going concern), relating to the consolidated financial statements of Stem, Inc. (f/k/a Star Peak Energy Transition Corp.) which is contained in that prospectus, and to the reference to our Firm under the caption “Experts” in the prospectus.

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