---
schema_version: "secwatch.filing_event.v1"
accession: "0001537435-24-000054"
form_type: "8-K"
ticker: "TGEN"
cik: "0001537435"
company_name: "TECOGEN INC."
filed_at: "2024-05-03T23:59:59+00:00"
generated_at: "2026-06-02T23:08:18.960172+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Tecogen expands maintenance portfolio by 31 cogeneration units; 48 more potential

## Summary
- Second Amendment effective May 1, 2024 adds maintenance agreements for 31 cogeneration units to Tecogen.
- Aegis will use commercially reasonable efforts to support assignment of 48 additional units.
- Amendment extends March 2023 agreement, increasing Tecogen's recurring service revenue stream.

## SEC filing metadata
- accession: 0001537435-24-000054
- form_type: 8-K
- ticker: TGEN
- cik: 0001537435
- company_name: TECOGEN INC.
- filed_at: 2024-05-03T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1537435/000153743524000054/0001537435-24-000054-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1537435/000153743524000054/tgen-20240501.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001537435-24-000054
- JSON: https://secwatch.observer/filing/0001537435-24-000054.json
- Plain text: https://secwatch.observer/filing/0001537435-24-000054.txt

## Key facts
- Material Agreements
  TECOGEN INC. amended Agreement Regarding Assignment of Certain Maintenance Agreements with Aegis Energy Services LLC (effective 2024-05-01).
  - Action: amendment
  - Counterparty: Aegis Energy Services LLC
  - Effective: 2024-05-01
  source text: Effective May 1, 2024 Tecogen Inc. (“Tecogen”) and Aegis Energy Services LLC (“Aegis”) amended the Agreement Regarding Assignment of Certain Maintenance Agreements dated as of March 15, 2023 by and between Tecogen and Aegis, as amended, to add to the agreements assigned to Tecogen by Aegis maintenance services agreements for thirty-one (31) cogeneration units (the “Second Amendment”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1537435/000153743524000054/0001537435-24-000054-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.