Segment
Energy storage: shifting electricity through time
A grid with a large share of solar and wind has energy at the wrong times. Storage moves it, and lithium-ion batteries have become cheap enough to do that at scale for a few hours — which covers the daily cycle and leaves the seasonal problem unsolved.
In one sentence
Grid energy storage absorbs electricity when supply exceeds demand and returns it later, using batteries for short durations and a range of mechanical, thermal and chemical approaches for longer ones.
Battery storage grew explosively once cells became cheap, and it has been remarkably useful: it shifts solar generation into the evening peak, provides frequency response faster than any generator can, and defers network upgrades. Almost all of it is iron-phosphate lithium-ion, where cycle life and safety matter more than mass.
What batteries do not solve is duration. Four hours is economic; a hundred hours is not, because cost scales with energy stored while revenue comes mostly from a few high-value hours. Bridging days of low wind and sun requires either a different technology or firm generation, and that gap is where the interesting arguments about decarbonisation now sit.
How this breaks down
Split by how long the storage can discharge for, and by what the connecting electronics can do.
- Utility-scale batteriesHow grid battery systems are built, what they earn, and why duration settles where it does.Definition pageChokepoint
- Long-duration storagePumped hydro, flow batteries, compressed air, thermal and hydrogen — and why none has taken over.Definition pageChokepoint
- Grid-forming invertersInertia, frequency stability, and what replaces the physics that large generators used to provide free.Definition pageChokepoint
What this depends on
2 of these are marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
- Supply chainChokepoint
Battery cells
Grid storage draws on the same cell supply chain as vehicles, mostly iron-phosphate chemistry.
Battery cells - Supply chainChokepoint
Grid connection
Storage projects sit in the same interconnection queues as generation and face the same delays.
Interconnection queues - Supply chain
Lithium supply
Stationary storage is now a large share of lithium demand, and the cell price that decides whether a project is viable tracks that market.
Lithium
Companies across Storage
Every company named on a step below this page, ordered by how many of those steps it appears at. Compiled from the pages themselves rather than written separately, so the two cannot disagree. Not a ranking and not a recommendation.
- Form EnergyPrivate1 step
- Huawei TechnologiesPrivate1 step
6 more companies appear at a single step each; they are named on the pages for those steps.
How these pages are written
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.
Plutux is not an investment adviser. Market data and AI-generated analysis are for information and education only, not investment advice. Disclaimer