Get Paid by Tesla, Octopus or Axle to Share Your Solar Battery

Get Paid by Tesla, Octopus or Axle to Share Your Solar Battery: Virtual Power Plants Explained

Your home battery already saves you money on your own bills. In 2026, it can earn you extra cash too — by lending a hand to the national grid when it’s under pressure.

The “virtual power plant” sounds like something out of a sci-fi film. What it actually means is refreshingly simple: your battery already sits there most of the day doing very little once your evening’s covered. A VPP operator asks to briefly borrow that spare capacity when the national grid is under strain, and pays you for the privilege.

This isn’t a future promise, either. Three genuinely operating UK schemes exist right now, in 2026 — run by Axle Energy, Octopus’s Kraken platform, and Tesla — and I’ve dug into what each one actually pays, what they need from your battery, and what you’re really signing up to.

What a virtual power plant actually does

A traditional power station is one big site generating hundreds of megawatts. A virtual power plant does the same job differently: it links thousands of home batteries (and sometimes EV chargers and heat pumps) through software, so they can be told to discharge together in seconds when the grid needs a burst of power. Individually, your battery is nothing to the National Energy System Operator (NESO), which balances Great Britain’s grid second by second. Collectively, tens of thousands of batteries add up to a genuine power station’s worth of flexible capacity.

This sits within NESO’s official Demand Flexibility Service, which now has more than 2.46 million businesses and households signed up through their energy suppliers or third-party aggregators. Ofgem approved an updated design for the service on 25 March 2026, making it easier for households to take part at more times of day. If you want the regulatory detail, it’s all on Ofgem’s own site, the industry regulator overseeing the whole scheme.

The three real UK routes in 2026

Which one you can actually join comes down mostly to your battery brand and whether you’re already an Octopus customer.

How much can you actually earn?

This is where a lot of headlines get misleading. Tesla’s own “up to £300 a month” launch claim is a ceiling figure from an exceptional grid event, not a typical result. The realistic, sustained number across all three schemes is more modest — but it stacks with money you’re likely already making from a smart tariff.

To put Axle’s £1/kWh in concrete terms: a 5kW inverter discharging flat out for an hour during a single stress event earns around £5. Four events in a month brings in £20, comfortably past the £10 monthly minimum. Multiply that across a typical year and £120-£300 is a realistic range — not life-changing, but genuinely free money on top of a battery you already own. For the fuller picture on what a battery earns you day to day before VPP income even enters the equation, SolarBriton’s Make Money From Home Battery Storage guide and Best Solar Battery UK 2026 are worth reading alongside this one.

What you actually need to take part

• A compatible battery brand. Axle currently supports Fox ESS, GivEnergy, SigEnergy, Solax and Solis, and is adding more. Tesla’s route needs a Powerwall specifically.
• A smart meter with export data, the same requirement as claiming the Smart Export Guarantee.
• An MCS-certified original installation in most cases — see SolarBriton’s MCS Certified Installers guide if you’re not sure your setup qualifies.
• Willingness to hand over temporary control of your battery’s discharge during grid events — more on that below.

What you’re actually giving up

Joining a VPP means the operator can discharge your battery during a stress event without asking you first, typically with limited advance notice. For most households this is genuinely no big deal, since events are infrequent and battery apps let you set minimum reserve levels so you’re never left with an empty battery unexpectedly. But it’s worth being clear-eyed about before signing up:

Do you pay tax on it?

For most households, no. VPP payments typically fall well within HMRC’s £1,000 a year tax-free trading allowance, which covers small amounts of casual income like this. If your combined miscellaneous income from all sources tips over £1,000 in a tax year, it’s worth checking your position, but a typical single-battery household earning £120-£300 a year from VPP dispatch has nothing to declare.

My honest take

If you already own a compatible battery, joining a VPP is close to a no-brainer — it’s free money for spare capacity you weren’t using anyway, and you can generally opt out whenever you like. Axle is the most flexible starting point right now if your battery brand qualifies, since it doesn’t ask you to change supplier at all. If you’re already an Octopus customer on Flux or Intelligent Octopus Go, you’re likely already benefiting from Kraken without having done anything extra — worth double-checking your tariff against SolarBriton’s Octopus Flux vs Cosy Octopus comparison. And if a VPP is the deciding factor in buying a battery in the first place, remember it’s the smaller of two income streams — get the underlying battery economics right first using SolarBriton’s Solar Diverter vs Battery guide and Adding a Battery to Existing Solar Panels guide, and treat any VPP income as a genuine bonus on top.

Frequently asked questions