BESS Revenue Stacking: valuing hybrid projects in 2026

How do we model flexible assets today?

One of the biggest sources of confusion in the energy sector is assuming that a BESS project can be valued the same way as a renewable project.

At first glance they look similar: both are electrical assets, both take part in energy markets and both aim to maximise revenue in a volatile environment. But they are completely different assets.

• A solar or wind project depends on the resource it receives.
• A battery depends on how it decides to operate.

A wind or solar plant has a more or less fixed profile, conditioned by weather patterns. A battery has thousands of possible profiles every day, because its value lies not in producing energy but in choosing when to charge, when to discharge and in which market to do so.

This means that valuing energy-storage projects, whether standalone or hybridised with renewables, requires a completely different methodology.

Revenue stacking: a completely different revenue model

While traditional renewable assets depend on one or two main markets, a battery's revenue comes from a simultaneous, strategic combination of multiple markets.

Batteries can generate revenue by arbitraging the day-ahead market, repositioning in intraday, providing balancing services such as secondary (aFRR) or tertiary (mFRR) frequency regulation and Replacement Reserve (RR), supporting congested nodes or through capacity mechanisms. On top of this come bilateral agreements and BESS-specific contracts, still emerging but growing.

Operational flexibility is the core of the business model.

The technical challenge: battery physics matters

Storage is not a "virtual" asset that can be assumed ideal in a spreadsheet. Its physical behaviour directly conditions its ability to generate revenue:

• Charge and discharge efficiency is not constant; it varies with state of charge, applied power and temperature.
• Degradation is not uniform: each cycle has a different cost depending on its depth and intensity.
• Every battery is subject to real operating limits: maximum power, point-of-interconnection (PoI) constraints, allowed ramps, state-of-charge limits and the electrical limitations of each installation.

Price is no longer an input: it is a simulation

A battery's value lies in spreads, intraday volatility, steep system ramps and extreme days. That is why "battery-ready" price-forecast curves are needed, able to reproduce extreme events and real market behaviour.

A battery does not always operate the same way: it can adopt aggressive, balanced or conservative strategies, and each leads to very different financial outcomes. There is no single "correct" number: the result is a strategic range of possible outcomes.

Multi-market valuation: the real bottleneck

A battery can take part, sometimes simultaneously, in several markets. When is it better to arbitrage and when to reserve capacity for balancing? When should it not operate to avoid degradation? What happens if the operator does not execute the optimal strategy, or if a regulatory reform changes the rules?

Building uncertainty into the model makes it possible to define alternative futures, modify grid conditions, liquidity and renewable penetration, compare configurations and analyse the resulting cashflows.

Modelling a BESS means modelling its behaviour

Proper valuation models treat uncertainty as a central piece. Tools such as One Hub Analytics simulate the real behaviour of a BESS or hybrid project across different futures, assess its participation in all relevant markets and show how operational decisions impact revenue, degradation and financial KPIs.