Energy and transition economics
2026-04-26
14 minute read
12 sources
Long duration storage 2026: the four day battery becomes bankable
The LDES Council target of 4 day median duration, the IRA Section 48E investment tax credit at 30 to 50 percent, and Form Energy's first commercial iron air block in Lincoln Maine pulled long duration storage from a thesis into a procurement category.
Long duration energy storage (LDES) became a bankable asset class between 2024 and 2026. The LDES Council 2024 update set a 4 day median discharge target for the technologies that would matter, defined as 10 to 24 hour systems for daily firming and 100 hour systems for multi day reliability. Form Energy energized its first commercial iron...