    <SEC-DOCUMENT>0001628280-26-034367-index.html : 20260513
    <SEC-HEADER>0001628280-26-034367.hdr.sgml : 20260513
    <ACCEPTANCE-DATETIME>20260513063659
    ACCESSION NUMBER:		0001628280-26-034367
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		28
    CONFORMED PERIOD OF REPORT:	20260512
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Unregistered Sales of Equity Securities
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20260513
    DATE AS OF CHANGE:		20260513

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Eos Energy Enterprises, Inc.
    		CENTRAL INDEX KEY:			0001805077
    		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
    		ORGANIZATION NAME:           	04 Manufacturing
    		EIN:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-39291
    		FILM NUMBER:		26970824

    	BUSINESS ADDRESS:
    		STREET 1:		3920 PARK AVENUE
    		CITY:			EDISON
    		STATE:			NJ
    		ZIP:			08820
    		BUSINESS PHONE:		(732) 225-8400

    	MAIL ADDRESS:
    		STREET 1:		3920 PARK AVENUE
    		CITY:			EDISON
    		STATE:			NJ
    		ZIP:			08820

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	B. Riley Principal Merger Corp. II
    		DATE OF NAME CHANGE:	20200227
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>eose-20260512.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: eose-20260512.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>eoseq1fy26earningsreleas.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: eoseq1fy26earningsreleas.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>eosepressreleasefrontier.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: eosepressreleasefrontier.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>eose-20260512.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: eose-20260512.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>eose-20260512_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: eose-20260512_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>eose-20260512_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: eose-20260512_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>eose-20260512_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: eose-20260512_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>eosepressreleasefrontier001.jpg
    <TEXT>
    Document 8 - file: eosepressreleasefrontier001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>eosepressreleasefrontier002.jpg
    <TEXT>
    Document 9 - file: eosepressreleasefrontier002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>eosepressreleasefrontier003.jpg
    <TEXT>
    Document 10 - file: eosepressreleasefrontier003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>eosepressreleasefrontier004.jpg
    <TEXT>
    Document 11 - file: eosepressreleasefrontier004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>eosepressreleasefrontier005.jpg
    <TEXT>
    Document 12 - file: eosepressreleasefrontier005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>eosepressreleasefrontier006.jpg
    <TEXT>
    Document 13 - file: eosepressreleasefrontier006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>eoseq1fy26earningsreleas001.jpg
    <TEXT>
    Document 14 - file: eoseq1fy26earningsreleas001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>eoseq1fy26earningsreleas002.jpg
    <TEXT>
    Document 15 - file: eoseq1fy26earningsreleas002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>eoseq1fy26earningsreleas003.jpg
    <TEXT>
    Document 16 - file: eoseq1fy26earningsreleas003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>eoseq1fy26earningsreleas004.jpg
    <TEXT>
    Document 17 - file: eoseq1fy26earningsreleas004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>eoseq1fy26earningsreleas005.jpg
    <TEXT>
    Document 18 - file: eoseq1fy26earningsreleas005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>eoseq1fy26earningsreleas006.jpg
    <TEXT>
    Document 19 - file: eoseq1fy26earningsreleas006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>eoseq1fy26earningsreleas007.jpg
    <TEXT>
    Document 20 - file: eoseq1fy26earningsreleas007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>eoseq1fy26earningsreleas008.jpg
    <TEXT>
    Document 21 - file: eoseq1fy26earningsreleas008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>25
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>27
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: FilingSummary.html

    Document 27 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>29
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 29 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>30
    <FILENAME>0001628280-26-034367-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 30 - file: 0001628280-26-034367-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>31
    <FILENAME>eose-20260512_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 31 - file: eose-20260512_htm.html

    Document 31 - RAW XML: eose-20260512_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>