Long-duration storage
A grid with more variable generation needs ways to keep energy for longer. I’m watching which approaches can become dependable, financeable projects.
What I’m watching: A dated change in how independent sources describe this technology’s possibilities, followed by new voices and sustained attention.
What could change the picture?
- What the evidence says
- The saved cost figure is a modelled future case for a particular flow-battery system. It is a useful reference, rather than an observed project quote or evidence that a financed installation earns an adequate return.
- Early recognition to watch
- A dated change in how independent sources describe this technology’s possibilities, followed by new voices and sustained attention
- Commercial confirmation
- A financed project demonstrates bankable operating economics. Next evidence: Collect contracted durations, demonstrated efficiency, warranties and bankable project finance.
- What people used to expect
- Working expectation to monitor: Cost per dependable hour of firm power remains constrained by Duration, degradation, siting and project finance. This is a research hypothesis, not measured consensus.
- What may be changing
- Potential change to investigate: A financed project demonstrates bankable operating economics. Current evidence does not yet demonstrate a broad change in belief.
- Who could benefit
- Candidate how a business could benefit in Long-duration storage: Test proprietary chemistry and project integration against lithium systems, pumped storage and flexible demand.
- Timing
- Catalyst dependent; no supported repricing date yet
- What the market may already expect
- Current price, expectations and investable exposure have not been assessed in this packet. Existing source evidence is not a buy or sell cue.
- The strongest reason to be cautious
- A low capital-cost claim can conceal low round-trip efficiency or infrequent revenue opportunities.
- What would change the view
- Reassess if measured dispatch revenue cannot cover capital and maintenance under plausible tariffs.
Detailed research notes
Dated research baseline, imported today rather than a new event: DOE modelled a USD 160/MWh 2030 baseline LCOS for a 100 MW, ten-hour flow-battery system before prospective innovation portfolios. (2024-08). This is a modelled future baseline, not an observed current project cost, buyer quote, revenue stack, financed return or delivered firm-power price. It covers one technology and one 100 MW, ten-hour specification; the report's lower scenarios require prospective innovations and investment.
Follow the evidence
DOE modelled a USD 160/MWh 2030 baseline LCOS for a 100 MW, ten-hour flow-battery system before prospective innovation portfolios. Limitation: This is a modelled future baseline, not an observed current project cost, buyer quote, revenue stack, financed return or delivered firm-power price. It covers one technology and one 100 MW, ten-hour specification; the report's lower scenarios require prospective innovations and investment. Existing research checked 2026-10-05.
low confidence · Assessment 17 Oct 2026. Evidence dates are shown separately.