<SEC-DOCUMENT>0001104659-21-142362-index.html : 20211122
<SEC-HEADER>0001104659-21-142362.hdr.sgml : 20211122
<ACCEPTANCE-DATETIME>20211122132127
ACCESSION NUMBER:		0001104659-21-142362
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20211122
DATE AS OF CHANGE:		20211122
GROUP MEMBERS:		BREAKTHROUGH ENERGY VENTURES, LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ESS Tech, Inc.
		CENTRAL INDEX KEY:			0001819438
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91696
		FILM NUMBER:		211431239

	BUSINESS ADDRESS:	
		STREET 1:		26440 SW PARKWAY AVE.
		STREET 2:		BLDG. 83
		CITY:			WILSONVILLE
		STATE:			OR
		ZIP:			97070
		BUSINESS PHONE:		(855) 423-9920

	MAIL ADDRESS:	
		STREET 1:		26440 SW PARKWAY AVE.
		STREET 2:		BLDG. 83
		CITY:			WILSONVILLE
		STATE:			OR
		ZIP:			97070

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACON S2 Acquisition Corp.
		DATE OF NAME CHANGE:	20200728

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BREAKTHROUGH ENERGY INVESTMENTS LLC
		CENTRAL INDEX KEY:			0001888406
		IRS NUMBER:				852618609
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		250 SUMMER STREET, 4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		857-327-8780

	MAIL ADDRESS:	
		STREET 1:		250 SUMMER STREET, 4TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>tm2132816d1_sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
Document 1 - file: tm2132816d1_sc13da.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-3
<SEQUENCE>2
<FILENAME>tm2132816d1_ex3.htm
<DESCRIPTION>EXHIBIT 3
<TEXT>
Document 2 - file: tm2132816d1_ex3.htm

</DOCUMENT>
</SEC-DOCUMENT>