Run by Halcyon.
An eight-week in-person residency at Halcyon's house in Washington, DC, this accelerator takes climate and energy ventures. Neither an investment amount nor an equity stake is published.
This programme has notes explaining its undisclosed figures, available in the full dataset.
Every figure above is taken from these pages, published by the programme or its parent organisation.
Compare all 2 Halcyon programmes.
Last verified 2026-09-07.