TECOGEN INC. | Business Contracts

Form of Non-Qualified Stock Option Award Agreement (Non-Employee Director Form) (Filed With SEC on March 9, 2022)

Tecogen Inc. Policy Regarding Compensation of Non-Employee Directors (Filed With SEC on March 9, 2022)

Description of Registrant's Securities (Filed With SEC on March 12, 2020)

Letter Agreement dated July 22, 2019 between Registrant and John N. Hatsopoulos amending Advisory Agreement (Filed With SEC on July 25, 2019)

Form of Restricted Stock Award Agreement (Filed With SEC on March 9, 2022)

Form of Non-Qualified Stock Option Award Agreement (Employee Form) (Filed With SEC on March 9, 2022)

Form of Incentive Stock Option Award Agreement (Employee Form) (Filed With SEC on March 9, 2022)

Tecogen Inc. 2022 Stock Incentive Plan (Filed With SEC on March 9, 2022)

Webster Bank, NA letter dated January 11, 2021, confirming receipt of payment in full of registrant's obligation under the Paycheck Protection Loan dated April 17, 2020 (Filed With SEC on March 18, 2021)

Loan Documentation for Paycheck Protection Program Loan through Webster Bank dated April 17, 2020 (Filed With SEC on May 14, 2020)

Waiver No. 2 under Credit Agreement dated May 4, 2018 (Filed With SEC on March 12, 2020)

Transition Agreement dated as of June 6, 2019 by and between Tecogen Inc. and Ms. Bonnie Brown (Filed With SEC on June 10, 2019)

Waiver No. 2 under Credit Agreement dated May 4, 2018 (Filed With SEC on March 29, 2019)

Amendment No. 2 to, and Waiver No. 3 under, Credit Agreement dated as of March 5, 2019 (Filed With SEC on March 8, 2019)

Billing and Asset Management Agreement by and between Tecogen Inc. and CogenOne LLC, as amended and restated as of March 5, 2019 (Filed With SEC on March 8, 2019)

Billing and Asset Management Agreement dated as of March 5, 2019 by and between Tecogen Inc. and CogenTwo LLC (Filed With SEC on March 8, 2019)

Guaranty Agreement by Tecogen Inc. dated as of March 5, 2019 relating to Membership Interest Purchase Agreement dated March 5, 2019 (Filed With SEC on March 8, 2019)

Membership Interest Purchase Agreement dated as of March 5, 2019 between American DG Energy, Inc. and SDCL TG Cogen LLC (Filed With SEC on March 8, 2019)

Guaranty Agreement by Tecogen Inc. dated as of December 14, 2018 relating to Membership Interest Purchase Agreement dated December 14, 2018 (Filed With SEC on March 8, 2019)

Membership Interest Purchase Agreement dated as of December 14, 2018 between American DG Energy, Inc. and SDCL TG Cogen LLC (Filed With SEC on March 8, 2019)

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