A new wave of public and private support will be required to reboot investment in cleantech with slower capital event horizons. Without a likely pathway to a profitable takeover and facing a long grind to win support for an IPO, the heavy lifting requires supportive public policies that could attract such capital from institutional investors such as pension funds and family offices. Government procurement could also be used to create market beachheads for advanced technologies. But a new wave of public and private support will be required to reboot investment in the sector for it to advance forward at all.