Mainspring Energy Mainspring Energy (formerly known as EtaGen) is a technology company that provides clean energy solutions. | ![]() Tecogen Tecogen is a company that designs, manufactures, markets, installs, and maintains combined heat and power products. | ![]() CarbonCure Technologies CarbonCure Technologies is a company that develops carbon utilization technologies for the concrete industry. | ![]() Bayeco Bay Environmental Technology (Beijing) Corp. (hereinafter referred to as Bayeco) is a clean tech company. It provides a comprehensive and diverse range of air pollution control solutions for industrial VOC (Volatile Organic Compound), NOx and PM2.5. | |
Founding Date | Founding Date 2010 | Founding Date 2000 | Founding Date 2012 | Founding Date 1994 |
Type | Type Private | Type Public | Type Private | Type Private |
Tags | ||||
Locations | Locations Menlo Park, US HQ | Locations North Billerica, US HQ Toronto, CA Portland, US Waltham, US | Locations Dartmouth, CA HQ | Locations CN HQ |
Employees | Employees 5011% increase | Employees 911% decrease | Employees 874% decrease | Employees 11 |
Funding | ||||
Latest funding round | Latest funding round $ 95m (about 5 years ago) | Latest funding round N/A | Latest funding round $ 1.8m (about 10 years ago) | Latest funding round N/A |
Total funding raised | Total funding raised $ 178m | Total funding raised N/A | Total funding raised $ 6.9m | Total funding raised N/A |

Tecogen is a company that designs, manufactures, markets, installs, and maintains combined heat and power products.
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CarbonCure Technologies is a company that develops carbon utilization technologies for the concrete industry.
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Bay Environmental Technology (Beijing) Corp. (hereinafter referred to as Bayeco) is a clean tech company. It provides a comprehensive and diverse range of air pollution control solutions for industrial VOC (Volatile Organic Compound), NOx and PM2.5.
View company