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Europe's Battery Storage Boom Shifts Toward Energy Arbitrage, Wood Mackenzie Says

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Revenue opportunities for utility-scale battery storage projects in the Netherlands and Belgium are shifting away from ancillary grid services toward energy arbitrage as growing deployment intensifies competition and erodes traditional income streams, Wood Mackenzie said on Thursday.

Wood Mackenzie analysts said that revenues from frequency containment reserve and automatic frequency restoration reserve have dropped in both markets as battery capacity expands, mirroring trends in Britain and other European countries.

Alex Cipolla, senior research analyst, Energy Storage at Wood Mackenzie, said that as battery capacity scales, competitive pressure on ancillary services intensifies, prices fall, and the revenue stack rebalances toward energy arbitrage.

Energy arbitrage, buying electricity when prices are low and selling when prices are high, is projected to account for the largest share of battery revenues in both countries over the lifetime of projects, with that contribution increasing through the 2030s.

Wood Mackenzie said that while the Dutch and Belgian markets share similar geographic characteristics, their regulatory frameworks differ.

Belgium remains one of Europe's most attractive battery investment destinations due to its established capacity remuneration mechanism and a 10-year exemption from grid fees for transmission-connected assets, the consultancy said.

The combination of merchant revenues and capacity market payments helps support project returns even under challenging market conditions.

However, Wood Mackenzie said that the key risk facing developers is regulatory uncertainty surrounding the future of the grid-fee exemption, which may not remain in place indefinitely.

Dutch battery projects, in contrast, face higher cost pressures despite strong market fundamentals, including high levels of renewable energy penetration, persistent grid congestion, and rising power price volatility.

"The structural case for storage is strong," Cipolla said, adding that Dutch market fundamentals rival those of Germany and in some areas exceed them.

However, grid connection fees remain a major obstacle to profitability. Depending on the scenario, Wood Mackenzie said battery projects in the Netherlands can lose between five and 10 percentage points of internal rate of return compared with similar projects in Germany.

Recent regulatory reforms aimed at introducing more flexible grid connection arrangements and emerging congestion management revenue streams could improve project economics, but developers continue to face narrow margins.

The consultancy said four-hour battery systems currently offer the strongest economic performance in both markets, benefiting from a balance between energy arbitrage opportunities, cycling requirements, and exposure to grid fees.

Meanwhile, falling battery costs are emerging as a major tailwind for the sector, helping offset pressure from declining ancillary service revenues.

Wood Mackenzie said that as Europe's utility-scale battery market evolves into a broader investment class, investors are increasingly scrutinizing revenue assumptions that underpin project valuations and financing decisions.

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