Tesla and NatPower signed a multi-year agreement this week to deploy 25 GWh of Megapack battery storage across Italy and the UK — the first phase of a program with construction costs of $4 to $5 billion and a stated ceiling above 100 GWh. The deal is the largest single Megapack commitment Tesla has ever announced in Europe.
The number that matters isn't $5 billion or 25 GWh. It's this: phase one alone is more than half of all the energy storage Tesla deployed globally in all of 2025.
That fact reframes the deal. Tesla isn't just announcing a European expansion. It's announcing that its energy storage business is now operating at a scale where a single customer commitment equals half a year's global output. The rest of the conversation about Tesla — the cars, the robotaxis, the humanoid robots, the brand drama — is happening alongside a storage business that has quietly become structurally more important than the cars ever were.
What's actually being built
Under the agreement announced Tuesday:
- Phase 1: 25 GWh of Megapack storage across 5 initial projects in Italy and the UK
- Construction cost: $4-5 billion
- Long-term program ceiling: >100 GWh
- 20-year revenue potential: >$15 billion (per NatPower framing)
- Beyond hardware: Tesla provides its trading software for energy arbitrage and market participation
The trading software piece is more important than it sounds. Megapack hardware is a battery. With trading software, a Megapack site becomes a revenue-generating grid asset — buying electricity when prices are low, selling when prices are high, and participating in balancing markets for additional revenue. The same physical equipment, with the dispatch intelligence, captures materially more value.
Tesla has been quietly building this hardware-plus-software model for years. The NatPower agreement is the most explicit acknowledgment yet that Tesla's competitive moat in storage is the dispatch software, not the cells.
What NatPower is
NatPower is an Italy-headquartered battery storage developer. CEO Fabrizio Zago framed the deal as solving the sector's biggest operational problem:
"The sector has access to technology and capital but still struggles to deliver infrastructure consistently and within the required timelines. What we have built with Tesla is an ecosystem that enables alignment between capital and execution, and that can be replicated across multiple markets."
The "delivery within required timelines" language is the key. Battery storage developers routinely announce gigawatt-hour-scale projects and deliver them years late, if at all. Permitting, interconnection, and supply chain bottlenecks are the constraints. Zago is signaling that the Tesla partnership is the answer — pre-integrated Megapack systems (the new Megablock and Megapack 3 unveiled September) cut installation time dramatically.
Why Europe right now
The deal lands at a specific moment in European energy policy. Italy and the UK have leaned heavily on battery storage to firm up renewables and avoid curtailment. Both countries have aggressive renewable energy targets, and both have hit the practical problem that solar and wind produce power when the weather cooperates, not when the grid needs it.
Battery storage is the firming layer that turns intermittent renewables into dispatchable capacity. Without storage, a country that builds 50 GW of solar has to over-build by a factor of two or three to guarantee capacity at peak demand. With storage, the same solar build can be sized closer to the average demand and stored until peak.
Italy and the UK are buying storage not because they want batteries, but because they want the firming capacity batteries provide as they continue adding intermittent renewables to their grids.
What this means for Tesla's storage business
Tesla's energy storage division has been the standout performer in the company over the past two years:
- 2025 deployments: 46.7 GWh, up roughly 48% year-over-year
- Q1 2026 deployments: ~14.4 GWh (record quarter)
- Megablock + Megapack 3 launched September (pre-integrated systems designed for faster installation)
- Storage is now a multi-billion-dollar annual revenue line that is growing faster than the car business
The NatPower deal phase-one alone (25 GWh) is roughly 54% of all 2025 deployments. If executed, the long-term ceiling (>100 GWh) is more than double Tesla's entire 2025 deployment volume.
What the smart part of the deal actually is
Electrek's analysis — and the underlying reality of how the storage business works — points to a conclusion that most Tesla coverage misses:
Tesla isn't just shipping steel boxes full of cells. It's embedding its trading and dispatch platform into the projects.
The hardware margin on a Megapack is real but bounded. The trading software margin is much higher and stickier. A Megapack site that runs on Tesla's dispatch platform is a Tesla-integrated asset, the same way an iPhone on Apple's App Store is an Apple-integrated customer. The hardware is the entry point; the software is the moat.
When investors and analysts debate Tesla's intrinsic value, they almost always focus on the car business — deliveries, margins, Cybertruck demand, FSD progress. The energy storage business, with its recurring software revenue across a fleet that's growing by 50% annually, is structurally similar to a SaaS business running on top of a hardware install base. The recurring revenue profile and the margin expansion as software scales are not visible in the car-centric framing.
What the broader deal pipeline means
The NatPower agreement fits a pattern Tesla has been building for years. Multi-billion-dollar Megapack contracts are no longer unusual. In 2024, Tesla secured an "absurdly large" multi-billion-dollar Megapack contract. NatPower extends that into a multi-market European framework with a stated 100 GWh ceiling.
If the broader 100 GWh program actually executes:
- Tesla's storage deployments would more than double from current run rate
- The storage business alone would generate $15B+ in revenue over 20 years from this single customer
- The dispatch software would compound as each additional Megapack site becomes another customer for the trading platform
The numbers aren't hypothetical. The 25 GWh phase one has named projects, named countries, named budget, and a named customer. The execution risk is real but the deal structure is concrete.
What to watch over the next 12 months
- Whether the 5 phase-one projects break ground. The single biggest risk to the deal is execution speed. European interconnection queues are notoriously slow. If the projects move forward on Tesla's stated timeline, the broader 100 GWh program is real. If they're stuck in permitting, the program is aspirational.
- Tesla's Q2 and Q3 2026 deployment numbers. Quarterly deployment volumes will tell us whether the Megapack business is still ramping at 50%+ annually or whether the supply chain has hit constraints.
- Whether other European Megapack contracts follow. If Italy-UK works, expect Germany, France, Spain, and the Nordics to be next. The NatPower agreement establishes a template for European expansion.
- Tesla energy storage as a stand-alone business reporting line. If Tesla starts reporting the storage business more granularly in earnings, the segment's contribution to company valuation becomes legible to investors.
The verdict
The NatPower-Tesla deal is the moment the Tesla energy storage business stops being a side story and starts being the structural story. A 25 GWh phase-one that exceeds half a year of all prior global deployment is not an incremental announcement. It's a signal that the storage business has reached the scale where single-customer commitments move the company's overall direction.
The cars are still Tesla's brand and identity. The storage business is increasingly Tesla's actual business. Investors who only look at the cars are missing the segment that's growing faster, generating higher-margin recurring software revenue, and now landing multi-billion-dollar multi-year contracts with European grid developers.
The 25 GWh phase one is what was announced. The >100 GWh ceiling is what makes the deal historically large. The trading software is what makes it strategically durable.
Tesla is, quietly, becoming an energy company.
Source: Electrek — Tesla, NatPower strike $5B deal for 25 GWh of Megapack storage. By Fred Lambert, 23 June 2026. AutoWheeler analysis built on the source reporting; opinion and interpretation are our own.