A long-running national accelerator competition for early clean technology companies in the United States.
Cleantech Open is one of the longest-running clean technology accelerator programmes anywhere, structured as a national competition with regional rounds across the United States.
It is largely volunteer-powered and takes no equity, which makes it accessible to founders at a stage where most programmes would not yet engage.
Thousands of companies have passed through the programme over its history, spanning energy efficiency, storage, water, transport, and agriculture.
Because it operates at a very early stage and takes no equity, it functions as a first structured step rather than a funding event.
Global Capital Network connects accelerator graduates with investors ready for the next round.
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