Filed by Broadscale Acquisition Corp.

Pursuant to Rule 425 under the Securities Act of 1933, as amended

and deemed filed pursuant to Rule 14a-12

of the Securities Exchange Act of 1934, as amended

Subject Company: Voltus, Inc.

Commission File No. 001-40057

SUBJECT: Voltus to Become Publicly Traded Company on the Nasdaq

Dear [Customer/Partner Name],

As a valued partner to Voltus, we wanted to take a moment to let you know about some exciting news. Today, we are thrilled to announce a significant milestone for Voltus as we plan to go public and list our stock on the Nasdaq through a business combination with a special purpose acquisition company (SPAC), Broadscale Acquisition Corp. (Nasdaq: SCLE). We issued a release this morning about the transaction, which can be read at the following link: Link.

Because Broadscale is already publicly traded, Voltus will become a public company when the deal is complete, trading on the Nasdaq under the ticker symbol “VLTS.” We expect to complete the transaction in the first half of 2022. We will continue to operate under the Voltus name and there will be no meaningful changes to the team or how we operate day to day. It’s business as usual at Voltus.

We believe that this event provides significant financial resources to fund our accelerated growth and globally scale our distributed energy resource technology platform to deliver even more value to our customers and partners. We are excited to kick off the next chapter in our journey and further partner with you to deliver on our collective vision to transform the grid and scale our technology platform for the future of electricity.

On behalf of our incredibly dedicated team of Voltans, I want to say “Thank You!” for believing in us. Voltus doesn’t exist without your trust and commitment to being part of an incredibly important energy transition. We’re excited about the road ahead and what that means for our partnership: better energy, more cash!

As we work through the process of transitioning to a public company, please continue to consider our partnership confidential beyond information that is already in the public domain.

Please don’t hesitate to reach out with any questions

All the Best,

Gregg Dixon

Co-Founder & Chief Executive Officer

Voltus

Forward-Looking Statements

This communication contains certain “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including certain financial forecasts and projections. All statements other than statements of historical fact contained in this communication, including statements as to future results of operations and financial position, revenue and other metrics planned products and services, business strategy and plans, objectives of management for future operations of Voltus, market size and growth opportunities, competitive position and technological and market trends, are forward-looking statements. Some of these forward-looking statements can be identified by the use of forward-looking words, including “may,” “should,” “expect,” “intend,” “will,” “estimate,” “anticipate,” “believe,” “predict,” “plan,” “targets,” “projects,” “could,” “would,” “continue,” “forecast” or the negatives of these terms or variations of them or similar expressions. All forward-looking statements are subject to risks, uncertainties, and other factors which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. All forward-looking statements are based upon estimates, forecasts and assumptions that, while considered reasonable by Broadscale and its management, and Voltus and its management, as the case may be, are inherently uncertain and many factors may cause the actual results to differ materially from current expectations which include, but are not limited to: 1) the occurrence of any event, change or other circumstances that could give rise to the termination of the definitive merger agreement with respect to the business combination; 2) the outcome of any legal proceedings that may be instituted against Voltus, Broadscale, the combined company or others following the announcement of the business combination and any definitive agreements with respect thereto; 3) the inability to complete the business combination due to the failure to obtain approval of the stockholders of Broadscale or Voltus, or to satisfy other conditions to closing the business combination; 4) changes to the proposed structure of the business combination that may be required or appropriate as a result of applicable laws or regulations or as a condition to obtaining regulatory approval of the business combination; 5) the ability to meet Nasdaq’s listing standards following the consummation of the business combination; 6) the risk that the business combination disrupts current plans and operations of Voltus as a result of the announcement and consummation of the business combination; 7) the inability to recognize the anticipated benefits of the business combination, which may be affected by, among other things, competition, the ability of the combined company to grow and manage growth profitably, maintain relationships with customers and suppliers and retain its management and key employees; 8) costs related to the business combination; 9) changes in applicable laws or regulations; 10) the possibility that Voltus or the combined company may be adversely affected by other economic, business and/or competitive factors; 11) Voltus’s estimates of its financial performance; 12) the risk that the business combination may not be completed in a timely manner or at all, which may adversely affect the price of Broadscale’s securities; 13) the risk that the transaction may not be completed by Broadscale’s business combination deadline and the potential failure to obtain an extension of the business combination deadline if sought by Broadscale; 14) the impact of the novel coronavirus disease pandemic, including any mutations or variants thereof, and its effect on business and financial conditions; 15) inability to complete the PIPE investment in connection with the business combination; and 16) other risks and uncertainties set forth in the sections entitled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in Broadscale’s Form S-1 (File Nos. 333-252449 and 333-253016), Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2021 and registration statement on Form S-4 with the SEC, which will include a document that serves as a prospectus and proxy statement of Broadscale, referred to as a proxy statement/prospectus and other documents filed by Broadscale from time to time with the SEC. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Nothing in this communication should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward looking statements will be achieved. You should not place undue reliance on forward-looking statements, which speak only as of the date they are made. Neither Broadscale nor Voltus gives any assurance that either Broadscale or Voltus or the combined company will achieve its expected results. Neither Broadscale nor Voltus undertakes any duty to update these forward-looking statements, except as otherwise required by law.

Use of Projections

This communication may contain financial forecasts of Voltus. Neither Voltus’s independent auditors, nor the independent registered public accounting firm of Broadscale, audited, reviewed, compiled or performed any procedures with respect to the projections for the purpose of their inclusion in this communication, and accordingly, neither of them expressed an opinion or provided any other form of assurance with respect thereto for the purpose of this communication. These projections should not be relied upon as being necessarily indicative of future results. The projected financial information contained in this communication constitutes forward-looking information. The assumptions and estimates underlying such projected financial information are inherently uncertain and are subject to a wide variety of significant business, economic, competitive and other risks and uncertainties that could cause actual results to differ materially from those contained in the prospective financial information. See “Forward-Looking Statements” above. Actual results may differ materially from the results contemplated by the projected financial information contained in this communication, and the inclusion of such information in this communication should not be regarded as a representation by any person that the results reflected in such projections will be achieved.

2

Additional Information and Where to Find It

This communication relates to a proposed transaction between Broadscale and Voltus. Broadscale intends to file a registration statement on Form S-4 with the SEC, which will include a document that serves as a prospectus and proxy statement of Broadscale, referred to as a proxy statement/prospectus. A proxy statement/prospectus will be sent to all Broadscale stockholders. Broadscale also will file other documents regarding the proposed transaction with the SEC. Before making any voting decision, investors and security holders of Broadscale are urged to read the registration statement, the proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC in connection with the proposed transaction as they become available because they will contain important information about the proposed transaction.

Investors and security holders will be able to obtain free copies of the registration statement, the proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC by Broadscale through the website maintained by the SEC at www.sec.gov.

The documents filed by Broadscale with the SEC also may be obtained free of charge at Broadscale’s website at https://www.broadscalespac.com or upon written request to 1845 Walnut Street, Suite 1111, Philadelphia, PA 19103.

NEITHER THE SEC NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR DISAPPROVED THE TRANSACTIONS DESCRIBED IN THIS COMMUNICATION, PASSED UPON THE MERITS OR FAIRNESS OF THE BUSINESS COMBINATION OR RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS COMMUNICATION. ANY REPRESENTATION TO THE CONTRARY CONSTITUTES A CRIMINAL OFFENSE.

Participants in the Solicitation

Broadscale and Voltus and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from Broadscale’s stockholders in connection with the proposed transactions. Broadscale’s stockholders and other interested persons may obtain, without charge, more detailed information regarding the directors and executive officers of Broadscale listed in Broadscale’s registration statement on Form S-4, which is expected to be filed by Broadscale with the SEC in connection with the business combination. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies to Broadscale’s stockholders in connection with the proposed business combination will be set forth in the proxy statement/prospectus on Form S-4 for the proposed business combination, which is expected to be filed by Broadscale with the SEC in connection with the business combination.

No Offer or Solicitation

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to buy, sell or solicit any securities or any proxy, vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be deemed to be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act.

3