Why Italy's Latest Battery Deal Is Counted in Grid Connections, Not Megawatt Hours

ZE Energy has bought a 200 MW battery project near Troia, in Apulia, from Aura Power. It is ready to build, stores more than 1 GWh and connects straight into the Italian transmission grid. The company now describes its Italian storage holdings as 300 MW of grid connection capacity. That is a different thing from 300 MW of batteries, and the distinction is the deal.

Key takeaways

• ZE Energy has acquired the 200 MW Elena BESS project near Troia in Apulia, southern Italy, from CVC DIF-backed Aura Power. Terms were not disclosed. BonelliErede and Kroll advised ZE Energy; Legance and JLL Capital Markets advised Aura Power.
• The project holds more than 1 GWh of storage behind 200 MW of power, a duration of five hours, and received Single Authorisation from Italy's Ministry of the Environment and Energy Security in July 2025. It is at ready-to-build stage.
• Elena will connect directly to an existing Terna substation on the 380 kV extra-high-voltage network at Troia, not through a distribution-level link.
• This is ZE Energy's second standalone Italian battery after the 98.5 MW Sessa Aurunca project in Campania, and takes its secured Italian position to 300 MW of grid connection capacity. ZE Energy targets 1.5 GW of installed capacity across France, Italy and Germany by 2030.
• Enerdatics calculates the project's investment at $280 million, or $1.4 million per MW, and expects commercial operations by December 2027. Both are Enerdatics estimates drawn from comparable regional projects rather than disclosed figures.

Why does ZE Energy count grid connections rather than megawatts?

Because the connection is the part of the project that cannot be bought twice. Grid connection capacity is the amount of power a site may push into or pull from the network at a specific point, issued by the network operator and finite at any given substation. A battery's megawatt rating is a procurement decision. Its connection right is not.

Add Sessa Aurunca at 98.5 MW to Elena at 200 MW and the arithmetic lands just short of 300 MW, but the number describes the grid access behind those two sites rather than the hardware on them. Italy has far more announced storage pipeline than Terna can physically accommodate, so the scarce asset is the queue position, and it takes years to obtain rather than an order placed with a supplier. At ready-to-build stage there is no battery yet. What changed hands is a permit, a site, a set of contracts and a point of connection.

What does a 380 kV connection change?

It puts the asset on the transmission backbone rather than behind a local network. 380 kV is Italy's extra-high-voltage level, the system that moves bulk power between regions, and a battery plugged in there is visible to the transmission operator as a unit it can call on directly. A distribution-level connection limits the asset to whatever the local feeder can carry.

The contrast with ZE Energy's first Italian asset is instructive. When Octopus Energy took a 50 percent stake in Sessa Aurunca, that project's connection was described as linking into a substation serving multiple power producers, positioning it as a local flexibility hub. Elena is built to sell into the national system instead.

Why size an Italian battery for five hours when the market builds four?

Duration is energy capacity divided by power rating, the number of hours a battery can sustain full output before it is empty, and it decides what the asset is commercially for. Short systems earn from responding quickly; long systems earn from moving energy across the day. Italy has settled on four hours. Of the Italian battery transactions Enerdatics records since the start of 2024 that state both power and energy capacity, eight sit at or just below four hours and only three go beyond it. ZE Energy owns two of those three. Sessa Aurunca runs for just over nine hours and Elena runs for five, which makes long duration a house preference rather than a one-off specification.

What the record does not contain is a contract. The revenue plan is described as storing electricity and returning it to the grid when required, supporting balancing and the integration of renewable generation. No offtake agreement is named. The extra hour beyond the Italian norm is therefore an unhedged view about how wide Italian price spreads will be when the asset starts operating, not a requirement written into a signed deal. In Spain, BW ESS bought a Valencia portfolio sized for five hours where the rest of the market builds four. In the Baltic states, where storage is paid mainly for being available, Estonia's largest battery deal runs for just over two hours. Duration is a statement about which problem the owner expects to be paid to solve.

Enerdatics records 29 Italian battery storage transactions since the start of 2024, and only five carry a disclosed value. Four are development-stage asset deals: a 196 MW portfolio bought by N2OFF, a 509 MW project bought by Airengy and B7 Energy, 1,100 MW bought by Renewable Power Capital from Altea Green Power, and ZE Energy's own $11.74 million purchase of Sessa Aurunca. Grossing minority stakes up to 100 percent places the four between $0.02 million and $0.12 million per MW, Sessa Aurunca highest at $0.12 million. The only priced Italian battery already in construction is Sosteneo's 49 percent of Enel Libra Flexsys, grossing up to $1.04 million per MW across 2,600 MW. On that record, Italian development rights have been changing hands at roughly 2 to 12 percent of what a battery under construction is worth.

What does the deal signal for the Italian storage market?

It signals that Italian pipeline is being routed rather than auctioned. Aura Power has just merged with Verdant Energy under CVC DIF to become a UK independent power producer, and continues to develop a European battery pipeline of around 7 GW across Italy, Portugal, Lithuania and Germany. It intends to work with ZE Energy again, and ZE Energy says several further acquisitions are at an advanced stage. A developer that has decided to keep its UK assets still needs an outlet for its Italian ones, and this looks like the start of a channel rather than a single clearing event.

The pricing picture is unchanged, which is itself the finding. Five disclosed values across 29 transactions means anyone valuing an Italian ready-to-build battery today works from four usable observations, across portfolios of very different quality and stage. The gap between those development prints and the single construction-stage print is wide enough that stage, not technology, is doing most of the work. Expect the next Italian storage trades to look like this one: longer than the market average, connected at transmission level, and closed without a number.

Frequently asked questions

How much did ZE Energy pay for the Elena BESS project?Terms were not disclosed. The closest comparable is ZE Energy's own purchase of the 98.5 MW Sessa Aurunca project for $11.74 million in October 2025, or $0.12 million per MW, the highest of four priced development-stage Italian battery deals Enerdatics records since the start of 2024.

What is grid connection capacity?It is the amount of power a site is authorised to inject into or draw from the network at a defined connection point. It is granted by the network operator, limited at each substation and slow to obtain, which is why a portfolio of secured connections is harder to replicate than a portfolio of batteries.

When will the Elena project start operating?Enerdatics expects commercial operations by December 2027 and believes construction financing will be secured by December 2026. Both are Enerdatics estimates based on comparable Italian projects rather than disclosed timelines.

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