Grid-scale energy storage is on track to absorb more capital over the next decade than onshore wind did in the last one. The IEA projects global storage capacity to grow more than fifteenfold by 2035, with the bulk of that build-out concentrated in the US, China, the EU, the Gulf, and India. Yet the majority of founders we advise are financing storage with the wrong capital type at the wrong stage, costing them speed, equity, and balance-sheet flexibility.

The correct capital stack shifts by maturity. At early stage (technology validation), venture capital and strategic corporate equity are appropriate — and the corporate LPs often bring the offtake commitments that catalyze the next round. At pilot and first-of-a-kind scale, grant capital, DFI debt, technology-risk insurance wraps, and blended-finance structures are dominant; equity at this stage is dramatically over-priced relative to the milestones being funded. At commercial deployment, tax equity (where applicable), project-level debt, infrastructure equity, and sovereign-anchored offtake agreements take over; raising further dilutive equity at this stage is a sign that the company has not built the project-finance relationships it needs. At fleet scale, structured-note programs, securitization, and yield-co spinouts open up — and the parent company can recycle capital out of seasoned assets to fund the next cohort.

The companies that understand this sequence raise efficiently. The companies that do not raise seven rounds of dilutive equity to fund what should have been infrastructure debt — and end up with a cap table that no infrastructure investor will touch when the time comes. Brillwood's Capital practice has advised on the full sequence — the sequencing is the strategy, and getting it right at the first project-finance milestone changes the trajectory of every round that follows.