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Battery storage is one of the fastest growing asset classes in energy, and one of the hardest to finance well. The technology is proven. The problem is revenue. A standalone battery earns from a stack of capacity payments, grid services and trading margins, much of it merchant, and lenders will only lend against the parts they can underwrite.
Financely builds and reviews financial models for battery energy storage systems (BESS) so that sponsors present a debt case lenders can size on. This article explains how lenders look at storage revenue, where most BESS models fall short, and how our modelling engagement works.
In this article
A solar or wind model starts from an energy yield and a contracted price. A storage model starts from a dispatch strategy. How often the battery cycles, which markets it serves and at what prices all depend on assumptions about future market conditions, and those assumptions drive almost every line of the cash flow.
That creates a gap between how sponsors and lenders view the same project. An equity investor may accept a merchant revenue forecast from a price curve provider at face value. A lender will haircut it, size debt mainly on the contracted portion, and want to see what happens to debt service if merchant revenue comes in well below forecast. A model that cannot show both views clearly will slow down or stop the financing.
Credit teams at banks, development finance institutions and private credit funds active in project finance focus on four areas when they review a storage model.
Each revenue stream is modelled separately, with contracted revenue from capacity contracts, tolling agreements or floors kept apart from merchant arbitrage and ancillary income. Lenders apply their own haircuts to merchant revenue and want independent price curves behind the forecast.
Usable capacity falls with every cycle. The model must track state of health against the warranty, cap cycling at warranted levels, and schedule augmentation capex to restore capacity where contracts require it. Missing augmentation is one of the most common gaps lenders find.
Round-trip efficiency, auxiliary consumption, availability guarantees, grid connection limits and any shared export capacity with co-located solar all reduce the energy that can actually be sold. Lenders expect these to tie to the supply contract and the technical adviser's report.
Storage debt is usually sized on a contracted case with a higher DSCR on any merchant revenue, shorter tenors and stronger protections such as cash sweeps, lock-up tests and reserve accounts. Where the contracted floor is thin, credit enhancement can close the gap.
The most common failure we see. A model that runs one blended revenue forecast, cycles the battery harder than the warranty allows and ignores augmentation. It shows attractive returns on paper, but once a lender separates contracted from merchant revenue and applies its own haircuts, the supportable debt can fall sharply and the equity requirement rises late in the process.
| Area | What lenders need to see |
|---|---|
| Revenue | Each stream modelled separately, with contracted and merchant revenue split, independent price curves sourced and documented, and a lender sizing case that applies merchant haircuts in one switch. |
| Dispatch and cycling | Annual cycles and depth of discharge consistent with the battery warranty and the revenue strategy, not set to maximise returns. |
| Capacity over time | A degradation curve tied to the supplier's warranty, with state of health tracked yearly and augmentation capex scheduled and funded. |
| Operating costs | Long-term service agreement, warranty extensions, insurance, grid charges, optimiser or route-to-market fees and auxiliary power costs, all indexed. |
| Debt | Debt sized on the lender case with sculpted repayment, cash sweep and lock-up mechanics, reserve accounts and a tenor matched to the contracted period. |
| Sensitivities | Merchant price, spread compression, degradation, availability, capex overrun, delay and interest rate cases, each showing DSCR and equity IRR. |
Tolling agreements. A creditworthy offtaker pays a fixed fee for the right to use the battery and takes the market risk. This is the closest storage gets to a solar PPA, and it supports the highest leverage and longest tenors.
Capacity contracts. Capacity market awards and resource adequacy contracts give multi-year fixed payments for being available. They often form the core of the senior debt case, with merchant income layered on top.
Revenue floors and swaps. An optimiser, trader or insurer guarantees a minimum revenue in return for a share of upside. Lenders can size against the floor, which turns a merchant asset into a partly contracted one.
Co-location with solar or wind. Pairing storage with a generation asset under a shared PPA can firm the output and improve the combined credit case, but the model has to allocate grid capacity, losses and costs between the assets correctly.
Part of a modelling engagement is testing which structure, or combination, gives the project the most debt at an acceptable risk. That analysis often changes how a sponsor negotiates with offtakers and optimisers.
We start with a deal assessment. You submit the project through a paid quote request. Our team reviews the project, any existing model, the supply and offtake contracts and the capital requirement, then issues an estimate with scope, fee and delivery schedule. The USD 500 assessment fee is credited against the retainer if you proceed.
We build or rebuild the model to lender standard. That can be a full build from the battery supply agreement, price curves and grid terms, or a structured review and repair of your existing model. The output is a clean, auditable model with separate revenue streams, a lender sizing case, degradation and augmentation, sculpted debt and a full sensitivity suite.
We tie the model to the credit story. We align the model with the information memorandum, risk matrix and data room so every assumption has a source document behind it. The full scope is on our project finance advisory deliverables page.
We take it to market when you are ready. Financely can run lender outreach across our network of more than 12,700 verified lenders, compare term sheets and support you through financial close. Sponsors who want the credit file built first, without placement, can start with our fixed-fee Lender-Ready Package, which includes model review and debt sizing. For an independent view of the debt case, see our debt underwriting services.
Storage is scaling fast. BloombergNEF expected global energy storage additions of 92 GW (247 GWh) in 2025, 23% above 2024, with cumulative capacity forecast to reach 2 TW by 2035 (BloombergNEF, 2025). The International Energy Agency estimated that battery storage investment would rise above USD 65 billion in 2025(IEA, World Energy Investment, 2025).
As more batteries come online, trading spreads in many markets compress and lenders get more cautious about merchant forecasts. Projects that can show a clear contracted case and a disciplined downside will keep raising debt on good terms. Projects that rely on a single optimistic revenue line will find it harder.
Send us your project details, revenue strategy, current model and capital requirement. We will assess the deal and issue an estimate covering scope, fee and delivery schedule for the modelling work and any wider capital raising support.
If your offtake or floor contract is still under negotiation, now is the best time to model it. The structure you sign will decide how much debt the project can carry.
It is possible but harder, and leverage is usually lower with shorter tenors and tighter covenants. Most lenders want some contracted revenue, such as a capacity contract, toll or revenue floor, to anchor the debt case.
Yes. We model standalone BESS and storage co-located with solar or wind, including shared grid connections and hybrid offtake structures.
We use the independent price curves the project has commissioned or that lenders accept, and model the lender's haircut on top. Lenders generally expect curves from a recognised independent market adviser.
It depends on project size, the number of revenue streams, whether storage is co-located and whether we build or review. Every engagement starts with a USD 500 deal assessment, which is credited against the retainer, and you receive a fixed one-off fee in the estimate.
Yes. Financely is a debt advisory and arranging firm. Once the model and credit package are ready, we can run lender outreach, compare term sheets and support the transaction through financial close.
This article is for general information only and does not constitute legal, tax or investment advice. Financely is an advisory and arranging firm, not a lender or broker-dealer. Any financing is subject to lender underwriting, due diligence, credit approval, documentation and conditions precedent. No financing outcome, amount or timeline is guaranteed.
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