This revision of the government’s National Infrastructure Investment Plan, 2021–2030 (NIIP3) to include the government’s response to the HTHH event (NIIP3-HTHH) is part of the longer-term mobilization of resources to repair the resulting infrastructure damage within the context of the wider infrastructure needs. As a result, this report covers the needs directly attributable to the HTHH event and the needs that have emerged since the start of the NIIP3. There are 47 new projects identified for the NIIP3-HTHH, 21 of which are fully attributable to the HTHH event (including the eruption, tsunami, and ashfall), and 7 partly attributable.