Tolling Agreements: The smart way to secure your BESS returns in Sweden

Battery Energy Storage Systems (BESS) are now a critical part of Sweden’s energy infrastructure. They help balance the grid, support renewables, and respond quickly when supply dips or demand peaks.

But owning a BESS doesn’t guarantee a return.

Energy markets are unpredictable. Spot prices rise and fall. Merchant revenues are hard to forecast. For investors, this uncertainty makes it harder to justify building or buying into storage assets.

That’s where tolling agreements come in.

They offer a straightforward solution: trade market risk for predictable income.

How tolling agreements work

A tolling agreement is a contract between a BESS asset owner and an operator like GreenVoltis. You give us the right to run your battery. In return, you get a fixed payment over the contract period, usually several years.

We decide when to charge, when to discharge, and how to earn revenue from different energy markets. We take on the risks and the responsibility. You receive steady income, no matter how the market performs.

It’s not complex. It’s built for clarity and control.

Why BESS owners are choosing tolling

• Stable income

  You know what’s coming in, month after month. That makes it easier to plan—and easier to get financing.

• No exposure to market swings

  You’re not tied to energy price volatility. You get paid whether the market is high or low.

• Less operational burden

  You don’t need to monitor energy markets, manage charging strategies, or optimise bids. We do all of that for you.

• More investor confidence

  Predictable cash flows make your asset more attractive to banks and funding partners.

What it means for Sweden's storage market

More certainty means more investment. And more investment means more batteries in the ground, supporting a cleaner, more flexible grid.

Tolling agreements are already common in mature markets like the UK. They’re now coming to Sweden because they work. They turn a technical asset into a financial one, backed by a clear, contractual return.

They don’t rely on guesswork. They don’t need perfect market timing. They allow BESS owners to focus on long-term returns, not short-term trading.

GreenVoltis makes it work

We don’t just write the contract, we run the asset. With our Aether VPP platform and Chronos Edge optimisation, we manage performance, tap into the right markets, and aim to make more than the fixed payment we owe you. That’s how we make it worth our while.

You win by locking in a return. We win by running the asset well.

Think long-term. Choose stability.

Tolling agreements don’t eliminate every risk. But they remove the biggest one: the market itself. They give BESS owners a clear path to returns. And they give Sweden a faster route to building the energy storage it needs.

If you’re building or owning a battery, this is the model that makes the numbers work.

Get in touch with GreenVoltis. We’ll help you put a price on certainty.