EXHIBIT 31.1

TECOGEN INC.
CERTIFICATION

I, Benjamin M. Locke, certify that:
1.    I have reviewed this Annual Report on Form 10-K of Tecogen Inc.;
2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state
    a material fact necessary to make the statements made, in light of the circumstances under which such statements     were made, not misleading with respect to the period covered by this report;
3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly     present in all material respects the financial condition, results of operations and cash flows of the registrant as of,     and for, the periods presented in this report;

4.    I am responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
    a.    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be             designed under our supervision, to ensure that material information relating to the registrant, including its             consolidated subsidiaries, is made known to us by others within those entities, particularly during the             period in which this report is being prepared;
    b.    Designed such internal control over financial reporting, or caused such internal control over financial             reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of             financial reporting and the preparation of financial statements for external purposes in accordance with             generally accepted accounting principles;
    c.    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this             report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the         period covered by this report based on such evaluation; and
    d.    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred             during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an             annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's             internal control over financial reporting; and
5.    I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's     auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):
    a.    All significant deficiencies and material weaknesses in the design or operation of internal control over                 financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process,                 summarize and report financial information;    and
    b.    Any fraud, whether or not material, that involves management or other employees who have a significant             role in the registrant's internal control over financial reporting.
Date: March 18, 2021

/s/ Benjamin M. Locke
Benjamin M. Locke
Chief Executive and Financial Officer