So Energy supplier profile

So Energy's ownership, supply tariffs, export offers and domestic low-carbon services.

So Energy is a domestic gas and electricity supplier in Great Britain. It also sells solar, battery and EV-charger installations and refers heat-pump enquiries to partner installers.

The legal supplier is So Energy Trading Limited, company number 09263295. Companies House recorded it as active on 22 July 2026. It should not be confused with a similarly named installer, product manufacturer or network operator.

Ownership and scale

So Energy began trading under that name in 2015. In 2021 it combined with ESB Energy, the UK retail operation of Ireland’s Electricity Supply Board. ESB announced that it would own 75% of the combined business, which would continue under the So Energy brand.

So Energy says it supplies around 300,000 UK homes. That makes it a meaningful national supplier but not one of the very largest retail groups.

The ownership matters mainly for identifying who stands behind the brand. It does not turn an ESB tariff, warranty or service in another country into a So Energy obligation in Great Britain. The customer’s contract identifies the responsible entity.

Import tariff range

So Energy’s household range is built around several different pricing structures:

So Fixed: fixed unit rates and standing charges for the agreed term, normally with an early-exit fee
So Flex: the standard variable tariff, whose prices follow changes to the Ofgem price cap
So Green Tracker: a price-cap-linked variable tariff that So Energy markets as sitting below its standard capped tariff
So EV: a time-of-use electricity tariff with a cheaper period from midnight to 5am
So Unique: personalised peak, off-peak and super off-peak periods derived from the home’s smart-meter data

The names do not reveal the full cost. A quote can vary with postcode, payment method, fuel, meter configuration and contract version. Compare unit rates, standing charges, term, exit fee and any smart-meter requirement on the actual tariff information label.

So Energy’s public tariff page displayed inconsistent So EV overnight prices when checked on 22 July 2026. The existence of the midnight-to-5am window is clear, but the rate shown in a dated article should not override the figure in the customer’s quote and contract.

So Unique also needs careful wording. So Energy describes it as a personalised tariff, but its public product page was still inviting people to join a waiting list on 22 July 2026. It should not be presented as generally available to every household until the sign-up journey confirms that.

What “renewable electricity” means here

So Energy says renewable electricity comes as standard on its fixed tariffs and on So Green Tracker, while So Flex is its non-green standard variable tariff.

This is a supplier accounting claim, not a promise that renewable generation is physically routed to the property at every moment. Electricity from all generators is mixed on the public network. Renewable-backed retail tariffs normally use Renewable Energy Guarantees of Origin and, in some cases, direct purchasing arrangements to match customer consumption over an accounting period.

So Energy also describes power-purchase arrangements with named renewable generators and lets customers vote on the generation technologies it should support. Those arrangements can provide a closer commercial link to generators than buying certificates alone, but they do not change how electricity flows through the grid.

The statutory fuel-mix disclosure is updated annually. A previous year’s percentages should remain labelled with their reporting period rather than being presented as the supplier’s permanent mix. Check So Energy’s current fuel-mix disclosure if the composition matters to a purchasing decision.

Export tariffs

So Energy is a mandatory SEG (Smart Export Guarantee) licensee for the SEG year from 1 April 2026 to 31 March 2027. Its export offer is separate from its import supply: the open tariff can be used even if another company supplies the household’s imported electricity.

So Energy advertised two export rates as at 22 July 2026:

So Export Flex at 4.5p/kWh
So Bright Export at 20p/kWh for 12 months

The higher rate is tied to the qualifying So Energy solar installation offer rather than being the default open SEG rate. Eligibility, duration and what happens after the 12-month period must be checked in the current plan terms and installation quote.

Both figures are market prices, not permanent features of the supplier. For a current cross-supplier comparison, use the dedicated SEG rates article rather than preserving this snapshot indefinitely.

The application page asks for suitable certification, DNO connection evidence, proof of generator ownership and an export MPAN or the information needed to arrange one. A suitable smart meter is needed for measured export. FIT export and SEG export cannot both be paid on the same installation, although FIT generation payments can continue after the export element is opted out.

Solar and battery installation

So Energy contracts for domestic solar PV, battery storage and related equipment. Its public material states that the installation service is MCS certified and belongs to the Renewable Energy Consumer Code and Energy Performance Validation Scheme.

The current solar terms provide a five-year workmanship warranty from commissioning and refer to insurance-backed protection. Equipment guarantees are the relevant manufacturers’ promises and are set out in the accepted quote. That distinction matters: a panel or battery’s advertised product warranty is not an extension of So Energy’s own workmanship cover.

The product catalogue, finance offers, equipment capacities and manufacturer warranties can change. A useful comparison should therefore use the proposed system design and contract rather than a supplier-profile list. Confirm:

the exact panel, inverter, battery and gateway models
usable battery capacity and charge/discharge power
whether backup is whole-home, selected-circuit or not included
workmanship and product-warranty providers
performance assumptions and exclusions
deposit and insurance-backed protection
who provides service if the product manufacturer or installer stops trading

So Energy’s terms also make clear that generation and financial estimates in an initial proposal are estimates, not guarantees. The final design, survey findings and accepted full quote govern the installation.

EV chargers and EV tariff

So Energy sells domestic EV-charger installations as well as the So EV import tariff. They are separate purchases: buying a charger does not itself guarantee access to a particular energy rate, and taking the tariff does not mean every charger feature is supported.

The tariff is marketed as working with any EV and charger because the cheap period applies to household electricity during a fixed overnight window rather than requiring So Energy to control a named vehicle. A communicating smart meter is still required for time-of-use billing.

Before combining the two, check the charger’s maximum power, cable and earthing arrangement, load management, solar integration and warranty, then confirm the tariff’s current off-peak rate, day rate, standing charge and term. An attractive overnight price can be outweighed by the rest of the tariff if most household consumption occurs outside the window.

Heat pumps

So Energy’s heat-pump pages refer customers to Heat Geek and Installio rather than presenting So Energy as the installing contractor. The selected partner’s survey, design, performance promise, contract and warranty therefore need to be reviewed on their own terms.

The partner can assess eligibility for the Boiler Upgrade Scheme, but the grant belongs to a government scheme with its own live rules. A supplier profile should not treat the current grant value or an assessment charge as a permanent part of So Energy’s offer.

For a heat-pump purchase, compare the room-by-room heat-loss calculation, design temperatures, emitter and hot-water changes, expected seasonal efficiency, electrical work and aftercare. The brand relationship is less important than the named installer’s design and contractual responsibility.

How to assess So Energy

Use the same evidence as for any supplier:

Confirm the legal company and current regulatory status.
Compare the full annual import cost using the home’s actual consumption and timing.
Treat export income as a separate calculation with its own eligibility conditions.
Read installation, finance and warranty contracts independently of the energy tariff.
Check current service and complaints data at the time of the decision rather than relying on an award or rating copied into a static profile.

So Energy’s breadth can be convenient, but buying supply, export and equipment from one brand does not make the contracts interchangeable. Each can be changed, ended or enforced under different terms.