Grid batteries crossed 100 GW a year — now watch duration

1

In 2025 the world installed 104 GW of grid batteries — 257 GWh — the first year ever above the 100-gigawatt mark. Forty percent of all battery capacity ever connected to any grid was connected in that single year.

2

The driver is cost. Turnkey systems fell 31% in a single year to $117/kWh — roughly 70% below 2022 — so the same capital now buys about three times the storage it did three years ago, per Volta's 2025 Battery Report.

3

None of this is a blip; it's a thirty-year curve. Lithium-ion cells cost about $9,210/kWh in 1991 and $78/kWh recently — a 99% decline, improving ~19% per doubling of production, almost exactly solar's old trajectory (Our World in Data).

4

Scale check: China added 37 GW in 2024 — its fleet roughly doubled — and passed 100 GW of installed storage by mid-2025. Globally, battery demand crossed 1 TWh in 2024, with stationary demand growing over 60% a year.

5

California is what compounding looks like on the ground: 13.4 GW operating, doubling roughly every 1.2 years, against a legislated 52 GW target for 2045. Hold that pace and the state arrives about two decades early — provided interconnection queues clear, which is a genuine if (ESS News).

6

The honest gap: 8-hour-and-longer storage is barely real outside China — about half a gigawatt, operational. Today's batteries erase evening peaks; they don't cover a windless, overcast week. In my view, the highest-leverage fixes are long-duration pilots and market rules that pay for duration, not just megawatts.

7

On safety: the January 2025 Moss Landing fire, in an older nickel-chemistry facility, forced roughly 1,200 people from their homes — that matters. But failures aren't scaling with the fleet; industry counts ~10–20 incidents a year even as capacity multiplies, a falling rate. The fixes are unglamorous: newer chemistries, siting setbacks, updated fire codes.

8

I don't trade in utopia or doom; I trade in arithmetic. Storage is now scaling faster than solar ever did, on a learning curve we've watched for thirty years — the open questions are duration and safety, not whether batteries work.

Grid batteries crossed 100 GW a year — now watch duration

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