Sector · Battery Storage (BESS)
BESS investment: what makes battery storage investable, and who funds it
Battery energy storage has moved from niche to mainstream infrastructure, and investors have become more discriminating as revenue models have shifted. We help BESS developers and owners raising £10m and above evidence what storage investors now check first.
How investors see it
Battery Storage (BESS): where capital comes from, and what it needs.
Early battery storage projects earned much of their revenue from frequency response services. As those markets have filled, revenue has shifted towards wholesale trading and the balancing mechanism, with capacity market contracts providing a contracted floor. Investors now underwrite a stacked, largely merchant revenue profile, and they scrutinise the assumptions behind it accordingly.
That shift is why tolling agreements, floor arrangements and optimisation contracts with credible counterparties have become central to the financeability of a storage project, and why the duration of the battery, the route to market and the degradation and augmentation strategy all sit near the top of an investor's checklist.
Who we work with
- Developers of standalone, front of meter BESS projects
- Solar and wind developers adding colocated storage
- Owners of operational storage portfolios seeking refinancing or sale
- Platforms seeking growth equity to build a storage pipeline
Investor criteria
What investors check before they invest
The Investor Readiness Review tests each of these against your materials before an investor does.
| What investors check | What they expect to see |
|---|---|
| Grid connection | Import and export capacity, connection date and any non firm or curtailment terms, all documented. |
| Revenue stack | Independent revenue forecasts by service, capacity market position, and any tolling, floor or optimisation agreement with counterparty details. |
| Duration and technology | Battery duration matched to the revenue strategy, cell chemistry, supplier track record and warranty terms. |
| Degradation and augmentation | A modelled degradation curve, cycling assumptions consistent with the revenue case, and an augmentation plan and budget. |
| Safety and consent | Planning consent, fire safety strategy and engagement with the local fire service. |
| Model | A financial model that separates revenue streams, links cycling to degradation and supports any debt sizing. |
Capital providers
Who invests
Infrastructure funds
Ready to build and operational portfolios
Specialist energy transition funds
Development pipelines and platforms
Private credit and debt funds
Construction and holdco financing, often against floor or tolling contracts
Strategic investors
Utilities and trading houses seeking flexible capacity
Family offices
Co investment in projects alongside sponsors
Common issues
Where raises stall
Revenue forecasts without provenance
A single revenue line with no independent forecast and no breakdown by service.
Cycling and degradation disconnected
Revenue assumes heavy cycling while the degradation curve assumes light use.
Grid terms misunderstood
Non firm connections or curtailment exposure not reflected in the model.
No route to market
No optimiser, toller or trading strategy identified.
FAQ
Battery Storage (BESS): questions
Who are the main BESS investors?
Can a merchant BESS project raise debt?
What do BESS investors check first?
Find out what an investor will see before approaching the market.
The Investor Readiness Review is a fixed fee assessment of your opportunity, written from the investor side of the table. You receive a scored report, the issues most likely to stop an investor, and the order in which to address them.