Octopus Energy Generation and ZE Energy Back a 98.5 MW Battery Project in Southern Italy
On 16 June, Octopus Energy Generation and developer ZE Energy announced a joint investment in the Sessa Aurunca battery in Campania, southern Italy. The standalone system is rated 98.5 MW and 895 MWh, and is expected to enter service in 2028.
What was announced
ZE Energy will finish developing the project and deliver the battery and its grid connection. Octopus Energy Generation is investing through its Sky fund, and one report says it supplies about half of the equity needed. Neither company disclosed the amount, and we could not find one.
The battery connects through a private substation to a substation that already serves several power producers. Octopus describes it as the largest standalone battery in south-central Italy once running, and says construction is expected to begin in summer 2026.
How it will earn money
The project holds a fixed 15-year contract won through MACSE, the storage auction run by Italy's grid operator Terna. Octopus says it accounts for 42% of the capacity awarded in its region. A long contract like this reduces the revenue risk that has held back some large batteries elsewhere.
Octopus also says the battery could meet the daily electricity needs of about 130,000 Italian homes. That is the company's own illustration of scale, not a measured result, and a battery of this kind stores power for the grid rather than for individual households.
Why it matters for home battery owners
Large batteries and home batteries do different jobs, but they work on the same problem: surplus solar at midday and tight supply in the evening. The more storage a grid has, the easier it is to absorb cheap solar power. Italy is one of several European markets where that is becoming visible, and our Europe market deep dive covers how household storage fits in.
Octopus says it has more than 2 GW of battery, wind, solar and rooftop solar projects in Italy through developer investments. ZE Energy's chief executive described the deal as a step towards its 1.5 GW target by 2030. These are company targets, not commitments we can verify.
What we could not confirm
We could not find the project cost, the battery supplier or the exact start date for operations beyond 2028. Projects like this can slip, so treat the timeline as a plan. For household rules and incentives, see our Italy country guide.
Sources
- Octopus Energy: Octopus Energy Generation and ZE Energy plug into one of Italy's biggest battery projects
- Energy Storage (ESS News): ZE Energy, Octopus back 895 MWh battery project in Italy
Related guides
Want to know which battery size fits your home?
Use our free calculator to get a size, savings and payback estimate.