Macquarie and Infrastructure Funds Assert Dominance in European Battery Storage

Enel, RWE and Iberdrola were the first major players to invest in battery energy storage systems (BESS) in Europe over a decade ago. These large utilities mobilized their corporate balance sheets and internal capabilities—engineering, project construction, electricity market trading and asset management—to develop and operate the first generation of storage projects. According to industry analysts, their investments responded to strategic and technical logic rather than commercial considerations.

An Asset Now Accessible to Institutional Investors

This pioneering positioning has transformed battery storage into an established asset class now accessible to institutional private capital. Infrastructure funds are acquiring or creating BESS developer platforms equipped with advanced go-to-market capabilities. By supporting agile operators focused on optimization, these sponsors are accelerating sector institutionalization across fragmented European markets.

The operational model of these sponsors often relies on acquiring stakes in developer platforms to access project pipelines. These funds then provide construction financing or asset greening to deploy projects. This approach combines access to ongoing developments and industrial execution capabilities, according to available data.

Macquarie Asset Management Illustrates the Trend With Island Green Power

In May 2025, Macquarie Asset Management acquired Island Green Power, a British developer specializing in solar and BESS. This transaction constitutes, according to sector observers, a representative example of this dynamic. It reflects growing interest from infrastructure asset managers in platforms capable of executing projects end-to-end.

The entry of financial sponsors marks a maturity milestone for European BESS, historically structured around major utilities. The trend of acquiring developer platforms reflects a shift in sector financing. These players now combine access to project pipelines and execution capabilities to position themselves in growing European storage markets.