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Organization and nature of business (Details)
12 Months Ended
Sep. 30, 2023
Subsidiary One [Member]  
Name of Entity CN Energy
Date of Incoporation Nov. 23, 2018
Percentage of Ownership Parent
Place of Incorporation British Virgin Islands
Principal Activities Holding company
Subsidiary Two [Member]  
Name of Entity Energy Holdings
Date of Incoporation Aug. 29, 2013
Percentage of Ownership 100.00%
Place of Incorporation Hong Kong, China
Principal Activities Holding company
Subsidiary Three [Member]  
Name of Entity Zhejiang CN Energy
Date of Incoporation Jan. 14, 2019
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Holding company
Subsidiary Four [Member]  
Name of Entity Manzhouli CN Energy
Date of Incoporation Jan. 24, 2019
Percentage of Ownership 100.00%
Place of Incorporation Inner Mongolia, China
Principal Activities Holding company
Subsidiary Five [Member]  
Name of Entity Manzhouli CN Technology
Date of Incoporation Jun. 10, 2019
Percentage of Ownership 100.00%
Place of Incorporation Inner Mongolia, China
Principal Activities Holding company
Subsidiary Six [Member]  
Name of Entity CN Energy Development
Date of Incoporation Apr. 18, 2019
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Holding company
Subsidiary Seven [Member]  
Name of Entity Khingan Forasen
Date of Incoporation Mar. 05, 2009
Percentage of Ownership 100.00%
Place of Incorporation Heilongjiang, China
Principal Activities Produces and distributes activated carbon and biomass electricity
Subsidiary Eight [Member]  
Name of Entity Hangzhou Forasen
Date of Incoporation Mar. 16, 2006
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Distributes activated carbon products
Subsidiary Nine [Member]  
Name of Entity Zhongxing Energy
Date of Incoporation May 21, 2018
Percentage of Ownership 100.00%
Place of Incorporation Inner Mongolia, China
Principal Activities Produce activated carbon and steam for heating
Subsidiary Ten [Member]  
Name of Entity Zhejiang New Material
Date of Incoporation May 24, 2021
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Produce and sell wading activated carbon in the future
Subsidiary Eleven [Member]  
Name of Entity CN Energy USA
Date of Incoporation Mar. 31, 2022
Percentage of Ownership 100.00%
Place of Incorporation Delaware, U.S.
Principal Activities Investment, consultation and trading, inactive
Subsidiary Twelve [Member]  
Name of Entity Zhoushan Trading
Date of Incoporation Apr. 08, 2022
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Trading
Subsidiary Thirteen [Member]  
Name of Entity Ningbo Trading
Date of Incoporation Apr. 13, 2022
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Trading
Subsidiary Fourteen [Member]  
Name of Entity Zhejiang Yongfeng New Material
Date of Incoporation Oct. 11, 2022
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Trading
Subsidiary Fifteen [Member]  
Name of Entity MZ HK
Date of Incoporation Dec. 06, 2018
Percentage of Ownership 100.00%
Place of Incorporation Hong Kong, China
Principal Activities Holding company
Subsidiary Sixteen [Member]  
Name of Entity MZ Pintai
Date of Incoporation Jan. 22, 2019
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Holding company
Subsidiary Seventeen [Member]  
Name of Entity Yunnan Yuemu
Date of Incoporation Sep. 02, 2022
Percentage of Ownership 100.00%
Place of Incorporation Yunnan, China
Principal Activities Holding company
Subsidiary Eighteen [Member]  
Name of Entity Yunnan Honghao
Date of Incoporation May 06, 2013
Percentage of Ownership 100.00%
Place of Incorporation Yunnan, China
Principal Activities Forestry project investment and development
Subsidiary Nineteen [Member]  
Name of Entity Zhejiang Yongfeng
Date of Incoporation Oct. 11, 2022
Percentage of Ownership 100.00%
Place of Incorporation Zhejiang, China
Principal Activities Holding company