United States securities and exchange commission logo





                                July 16, 2021

       Adam Kriger
       Chief Executive Officer
       ACON S2 Acquisition Corp.
       1133 Connecticut Avenue NW, Ste. 700
       Washington, DC 20036

                                                        Re: ACON S2 Acquisition
Corp.
                                                            Registration
statement on Form S-4
                                                            Filed June 21, 2021
                                                            File No. 333-257232

       Dear Mr. Kriger:

              We have reviewed your registration statement and have the
following comments. In
       some of our comments, we may ask you to provide us with information so
we may better
       understand your disclosure.

              Please respond to this letter by amending your registration
statement and providing the
       requested information. If you do not believe our comments apply to your
facts and
       circumstances or do not believe an amendment is appropriate, please tell
us why in your
       response.

              After reviewing any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.

       Form S-4 filed June 21, 2021

       General

   1.                                                   Please highlight the
risk that the sponsor will benefit from the completion of a business
                                                        combination and may be
incentivized to complete an acquisition of a less favorable target
                                                        company or on terms
less favorable to shareholders rather than liquidate.
   2.                                                   Please clarify if the
sponsor and its affiliates can earn a positive rate of return on their
                                                        investment, even if
other SPAC shareholders experience a negative rate of return in the
                                                        post-business
combination company.
   3.                                                   Please disclose the
sponsor and its affiliates    total potential ownership interest in the
                                                        combined company,
assuming exercise and conversion of all securities.
   4.                                                   Clarify whether recent
common stock trading prices exceed the threshold that would allow
 Adam Kriger
FirstName  LastNameAdam
ACON S2 Acquisition Corp.Kriger
Comapany
July       NameACON S2 Acquisition Corp.
     16, 2021
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         the company to redeem public warrants. Clearly explain the steps, if
any, the company
         will take to notify all shareholders, including beneficial owners,
regarding when the
         warrants become eligible for redemption.
5.       Disclose the material risks to unaffiliated investors presented by
taking the company
         public through a merger rather than an underwritten offering. These
risks could include
         the absence of due diligence conducted by an underwriter that would be
subject to liability
         for any material misstatements or omissions in a registration
statement.
6.       Revise your disclosure to show the potential impact of redemptions on
the per share value
         of the shares owned by non-redeeming shareholders by including a
sensitivity analysis
         showing a range of redemption scenarios, including minimum, maximum
and interim
         redemption levels.
7.       Please revise to disclose all possible sources and extent of dilution
that shareholders who
         elect not to redeem their shares may experience in connection with the
business
         combination. Provide disclosure of the impact of each significant
source of dilution,
         including the amount of equity held by founders, convertible
securities, including warrants
         retained by redeeming shareholders, at each of the redemption levels
detailed in your
         sensitivity analysis, including any needed assumptions.
8.       Quantify the value of warrants, based on recent trading prices, that
may be retained by
         redeeming stockholders assuming maximum redemptions and identify any
material
         resulting risks.
9.       It appears that underwriting fees remain constant and are not adjusted
based on
         redemptions. Revise your disclosure to disclose the effective
underwriting fee on a
         percentage basis for shares at each redemption level presented in your
sensitivity analysis
         related to dilution.
10.      Please highlight material differences in the terms and price of
securities issued at the time
         of the IPO as compared to private placements contemplated at the time
of the business
         combination. Disclose if the SPAC   s sponsors, directors, officers or
their affiliates will
         participate in the private placement.
11.      So that shareholders may better understand the consideration to be
received following
         consummation of the transactions, please include a table in an
appropriate location of the
         prospectus that quantifies in separate columns a range of potential
values shareholders can
         expect to receive based on the formula disclosed for the conversion of
each ESS Common
         Stock and ESS Preferred Stock. For example, since New ESS Common Stock
   will be
         issued based on an adjusted equity value with the ESS Preferred Stock
receiving the
         consideration calculated on an as-converted basis as set forth in the
allocation schedule,
         plus earnout stock pursuant to the terms and conditions of the Merger
Agreement,    we
         would expect to see disclosure that identifies the dollar value of
such per share values
         based on share prices as of the most recent practicable date.
 Adam Kriger
FirstName  LastNameAdam
ACON S2 Acquisition Corp.Kriger
Comapany
July       NameACON S2 Acquisition Corp.
     16, 2021
July 16,
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Interests of STWO Directors and Executive Officers in the Business Combination,
page 4

12.      Please revise to quantify the aggregate dollar amount of the
securities held by the sponsor
         and its affiliates as of the most recent practicable date. Please
include the current value of
         loans extended, fees due, and out-of-pocket expenses for which the
sponsor and its
         affiliates are awaiting reimbursement. Provide similar disclosure for
the company   s
         officers and directors, if material.
Unaudited Pro Forma Condensed Combined Financial Information, page 20

13.      We note the tabular disclosure of the pro forma New ESS common stock
issued and
         outstanding immediately after the business combination on page 23.
Please clarify or
         revise the share numbers disclosed in footnotes (3) and (4) so that
they reconcile to the
         ESS Stockholders share number presented in the table.
14.      Refer to adjustments (J) and (K) in Note 3 on page 29. Please address
the need to reflect
         transaction costs in the pro forma statement of operations pursuant to
Rule 11-
         02(a)(i)(6)(B) of Regulation S-X.
15.      Refer to footnote 5 on page 32. Please disclose the specific terms and
conditions
         associated with the Earnout shares that will result in the shares
being vested.
The Background of the Business Combination, page 101

16.      Please elaborate on the business, attributes, due diligence and level
of negotiations with
         the 3 companies that you exchanged term draft sheets with.
17.      Please identify the consulting firms that provided a written report or
analysis to the STWO
         Board and management team.
18.      Please identify the second investment bank engaged as placement agents
for the PIPE.
19.      Please revise your disclosure in this section to include negotiations
relating to material
         terms of the transaction, including, but not limited to, structure,
consideration, proposals
         and counter-proposals, and size of PIPE. In your revised disclosure,
please explain the
         reasons for the terms, each party's position on the
         issues, and how you reached agreement on the final terms.
20.      We note your statement the projections were not intended to be used by
investors or
         shareholders. Please describe the reasons the projections were
prepared and the purpose
         for their inclusion in the registration statement.

Certain ESS Projected Financial Information, page 110

21.      We note your disclosure on page 111 that the financial projections
reflect numerous
         estimates and assumptions, including estimates and assumptions with
respect to general
         business, economic, industry, market, regulatory and financial
conditions, trends and other
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FirstName  LastNameAdam
ACON S2 Acquisition Corp.Kriger
Comapany
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         future events, and various other factors, as well as factors specific
to ESS    business.
         Please revise to describe such estimates and assumptions with greater
specificity and
         quantify where practicable.
22.      We note that your projected revenue is $2 million for 2021 and $3.5
billion for
         2027. Please explain the basis for the projections beyond year three
and justify the
         projections of year-over-year sustained revenue growth rates. The
disclosure relating to
         projected revenue of 3.5 billion in 2027 should be substantially
enhanced so that investors
         can understand how you derived this value.
23.      We note the following disclosure "[n]either ESS    nor STWO   s
management nor any of
         their representatives has made or makes any representation to any
person regarding the
         ultimate performance of ESS compared to the information contained in
the projections,
         and none of them intends to or undertakes any obligation to update or
otherwise revise the
         projections to reflect circumstances existing after the date when made
or to reflect the
         occurrence of future events in the event that any or all of the
assumptions underlying the
         projections are shown to be in error." Please revise your disclosure
to clarify that you will
         update this information to the extent required by law.
24.      Please explain why you believe the projections are in line with your
historic operating
         trends. If they are not, please explain why the change in trends is
appropriate to make your
         assumptions about growth reasonable under the circumstances.
25.      Please elaborate on the process you undertook to formulate the
projections and
         assumptions, including the parties who participated in the preparation
of the projections,
         and how they were used.
U.S. FEDERAL INCOME TAX CONSIDERATIONS OF THE REDEMPTION AND THE
BUSINESS COMBINATION, page 129

26.      We note your disclosure that it is intended that the Domestication
constitute a
            reorganization    within the meaning of Section 368(a)(l)(F) of the
U.S. Internal Revenue
         Code of 1986, as amended. Please revise your disclosure in this
section to clearly identify
         and articulate the opinion being rendered as to the tax consequences
of the Business
         Combination and clearly state in both the disclosure and short-form
opinion that the
         disclosure in this section is the opinion of counsel. If there is
uncertainty regarding the tax
         treatment of the transactions, counsel may issue a "should" or "more
likely than not"
         opinion to make clear that the opinion is subject to a degree of
uncertainty, and explain
         why it cannot give a firm opinion. Please revise your risk factor
disclosure accordingly.
         Please also remove language stating that this section is a
"discussion" or "summary."
         Refer to Section III of Staff Legal Bulletin 19.

ESS Management's Discussion and Analysis of Financial Condition and Results of
Operations,
page 191
 Adam Kriger
FirstName  LastNameAdam
ACON S2 Acquisition Corp.Kriger
Comapany
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27.      Refer to the liquidity discussion on page 198. Please quantify and
more fully disclose and
         discuss your long term liquidity requirements and priorities,
including potential changes in
         those priorities based on the impact of changes in the amount of cash
available to the post-
         combination company based on the amount of cash redemptions. In this
regard we note
         your disclosure on page 199 which indicates that you expect your
expenses related to
         personnel, manufacturing, research and development, sales and
marketing, and general
         and administrative activities to increase. And, we note your
disclosure on page 40 which
         indicates you are currently in discussions with a potential joint
venture partner that will
         include building manufacturing facilities.
28.      Please refer to the disclosure under Common Stock Valuation on page
201. Please
         disclose and discuss changes in the estimated fair value of your
common stock during the
         periods presented. Please address material differences between the
valuations used to
         determine the fair value of your common stock relative to the fair
value implied by the
         current merger transaction.
SBE Framework Agreement, page 207

29.      Please revise to clarify, if true, that there is no assurance that you
will achieve any portion
         of the $300 million in revenue opportunities.
Redemption Rights for Public Shareholders upon Completion of the Business
Combination, page
210

30.      We note that certain shareholders agreed to waive their redemption
rights. Please describe
         any consideration provided in exchange for this agreement.
Experts, page 243

31.      We note ESS was formed in 2011 and the current auditor was engaged in
2020. Please
         confirm that ESS did not change auditors during its two most recent
fiscal years or
         subsequent interim period; alternatively, please provide the
disclosures required by Item
         304 of Regulation S-K, including a letter from the former auditors,
filed as an exhibit to
         the registration statement.
Index to Financial Statements, page F-1

32.      Please revise the index to the financial statements to remove
redundant items.
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       Refer to Rules 460 and 461 regarding requests for acceleration. Please
allow adequate
time for us to review any amendment prior to the requested effective date of
the registration
statement.
 Adam Kriger
ACON S2 Acquisition Corp.
July 16, 2021
Page 6

       You may contact Mindy Hooker at 202-551-3732 or Kevin Stertzel at
202-551-3723 if
you have questions regarding comments on the financial statements and related
matters. Please
contact Asia Timmons-Pierce at 202-551-3754 or Jay Ingram at 202-551-3397 with
any other
questions.



FirstName LastNameAdam Kriger                             Sincerely,
Comapany NameACON S2 Acquisition Corp.
                                                          Division of
Corporation Finance
July 16, 2021 Page 6                                      Office of
Manufacturing
FirstName LastName