Tecogen

Tecogen

Tecogen was founded in 1987 by Benjamin Locke and a team spun out of Thermo Electron, the conglomerate that birthed a generation of energy and analytical-instrument companies. The original thesis was simple: a natural-gas engine driving a compressor could produce chilled water more efficiently than grid-dependent electric chillers, especially in the Northeast where spark spreads were wide. The firm took that core technology public on Nasdaq under the ticker TGEN, and it now operates as a commercial-stage manufacturer of combined heat and power (CHP) modules and chilling equipment for multifamily residential, healthcare, and hospitality buildings. The equipment line is bifurcated into two product families: the Tecochill gas-engine-driven chillers and heat-pump water heaters, and the InVerde cogeneration units that produce electricity and hot water simultaneously. The firm has placed more than 3,000 units across North America, with notable installations at NewYork-Presbyterian Hospital and multiple senior living communities in the Northeast (per public record). It sources through a direct sales force and manufacturer's representatives, covering the Eastern US, California, and select international markets including India via a joint venture. The service stack includes a unique Ultera emissions-control catalyst, which cuts CO, NOx, and formaldehyde at the engine exhaust — a compliance advantage in California's South Coast Air Quality Management District that few rival CHP manufacturers can match. Beyond the hardware, Tecogen operates a service business with roughly 1,000 long-term maintenance contracts, and a nascent energy-as-a-service arm that owns and operates the equipment on customer sites, selling chilled water, heat, and power under multiyear agreements (per the firm's official communications). In May 2024 the firm announced a $2.1 million project to install InVerde cogeneration units at a Connecticut multifamily complex (per the firm, May 2024). The company has historically operated at an annual revenue run rate in the $20–30 million range, with single-digit full-time employee count in the low hundreds. Tecogen's structural quirk is that it is not a private family office or a venture-stage startup but a small, publicly listed original equipment manufacturer that functions like an energy-infrastructure pure play. It competes against subsidiaries of much larger industrial conglomerates while maintaining its own vertically integrated service fleet, giving it a direct line to customer sites that larger rivals often outsource. This combination — public listing, own manufacturing, captive service, and energy-as-a-service financing — is unusual among sub-$100-million market-cap climate-hardware companies.