In 2026, building Battery Energy Storage in Estonia is getting even more profitable

From 1 January 2026, Estonian network and renewable charges for Battery Energy Storage Systems are calculated on net consumption only — not gross. The change cuts the cost basis of grid-scale BESS by roughly 30–40%, materially shifting the IRR of every battery project under construction in Estonia and turning previously borderline projects firmly profitable.

Since 1 January 2026, national charges and grid fees for Battery Energy Storage are calculated only on net consumption.

Flexibility in the electricity system gets talked about a lot, but storage has been treated more as an expensive exception than as a real part of the system. Since 1 January 2026 that has changed. An amendment to the Electricity Market Act sets a clearer, fairer rule for energy storage: both grid fees and the renewable-energy charge are now calculated on net consumption only. The upshot is that battery storage and other storage projects are meaningfully more economic, and they get built faster.

Under the old rule, a storage device was treated as both consumer and producer, so fees were charged on both the inbound and the outbound flows. That never reflected what storage actually does — its job is not to consume energy, it is to shift production and consumption in time. Net-based accounting gives storage a clearer regulatory home and an easier path to being built.

Under these rules, owners of storage systems no longer pay fees on all electricity that flows through the system during charging and discharging. Grid fees and renewable energy charges apply only to the amount of energy that is the final consumption in the system — called net consumption. This means that electricity temporarily taken from the grid and later fed back no longer incurs double charges.

The impact is biggest for large-scale battery systems. When both grid fees and the renewable-energy charge land on net consumption only, annual costs drop substantially.

For a 100 MW storage facility, the rule change is worth more than €3 million a year in saved fees. On a standard front-of-the-meter 1 MW / 2 MWh industrial battery, savings reach €30,000 a year — close to a 10% lift in net profit on top of a typical Estonian mFRR-led case.

That improves the case for new investment and makes storage projects more competitive, exactly when the system needs them most: renewable share is climbing fast and the demand for large-scale storage with it.

The change is part of a wider modernisation of the electricity market — one designed to support storage and demand response and to take some of the volatility out of prices. A clearer fee structure lets storage do what it is actually good at: keeping the grid stable, integrating renewables, and making the system more flexible and resilient. Estonia moving first is a useful signal for the rest of Europe — a hint that the regulatory frame, not just the technology, is what unlocks the next phase of the energy transition.

Read more on Elektrilevi’s website: Elektrilevi.ee