The headline number: 29 GW

According to ENTSO-E's Summer Outlook 2026, installed battery storage capacity in Europe roughly doubled year on year to around 29 GW by summer 2026. Over the same period, 126 GW of additional renewable generation capacity was added, predominantly photovoltaics — a ratio that illustrates both the scale of the storage build-out and the size of the gap that remains.

ENTSO-E's assessment is deliberately measured. Batteries can absorb short-term surpluses, release energy later, and provide balancing energy and other system services, but they do not replace grids or additional generation capacity. The outlook also flags that project economics depend heavily on procurement conditions — a reminder that megawatt figures alone do not describe a bankable market.

Austria's EVN anchors a 300 MW target

At company level, Austrian energy group EVN AG (ISIN AT0000741053) confirmed at its Capital Markets Day on 1 October 2026 a goal of building a battery storage portfolio totalling 300 MW of power by 2030. The Lower Austria-based utility said the technology complements its investments in wind power and photovoltaics by better aligning electricity generation and consumption over time — the classic flexibility argument now being made by incumbent EU utilities across the bloc.

Where the growth is expected next

Investment in battery storage is expected to accelerate in major markets including Germany and Italy, driven by high energy prices and supply disruption concerns. Those two markets, together with the Netherlands and Bulgaria, are forming the core of the EU's near-term pipeline, while smaller member states depend more heavily on EU grants and auction schemes to get projects over the line.

Reading the data carefully

Three caveats are worth keeping in view. First, capacity additions are not evenly distributed: Bulgaria alone accounts for roughly 6 GW of the European total, an outsized share for a mid-sized member state. Second, duration matters as much as power rating — a gigawatt of two-hour batteries and a gigawatt of five-hour batteries deliver very different system value. Third, storage growth is running into grid and permitting limits: long waits for regulatory approvals and grid connections have delayed projects across the EU, and narrowing wholesale price spreads are eroding the arbitrage revenue that early business cases relied on.

The next test for the 29 GW figure will be whether the 2030 targets announced by utilities such as EVN, and the national plans of Germany, Italy, Greece and Bulgaria, translate into commissioned assets rather than announced pipelines.

Source: wallstreet-online.de / ENTSO-E Summer Outlook 2026

This article was assisted by AI analysis. Please refer to the original source for official information.