Plug-in solar is now legal to use in Great Britain. SI 2026/848 came into force on 27 August 2026 and Ofgem has approved the G98 connection changes — only kits listed on the ENA Type Test Register may be used, and Northern Ireland is not covered. Read the UK legal status

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Thunder Bolt kits now Compliant on ENA register

Four Thunder Energy entries that were Non-compliant on Sunday were Compliant when we read the register on Wednesday. One entry vanished altogether. The date of your check matters more than you might think.

Written and edited by Christopher Panteli

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Christopher is the founder and editor of MyPlugInSolar. He oversees the site’s research standards, data tools and editorial process. He is not an electrician or solar installer, and specialist technical claims are sourced from official documentation or reviewed by appropriately qualified professionals.

At a glance

  • We read the register on 7 October 2026: 120 Compliant plug-in solar entries from 26 suppliers, and 15 Non-compliant. On 5 October it was 115 from 25, and 20.
  • Thunder Energy’s four Thunder Bolt entries, added on 5 October as Non-compliant, are now Compliant. The brand has six Compliant entries.
  • Smith Bros’ SolarGo-One 435 also moved to Compliant, taking it onto the list of suppliers with a compliant kit.
  • The Solen Energy UK entry added on 5 October has been removed entirely. Entries can disappear, not just change status.
  • HEPA Solar, a German maker, appears for the first time with one Non-compliant entry.

We read the ENA Type Test Register on 7 October 2026, two days after our last check. The headline totals moved from 115 Compliant entries to 120, from 26 suppliers, with 15 now marked Non-compliant. The number of entries in total did not change: 135 both times.

That stability hides a lot of movement, and this is the clearest illustration yet of why we date every check.

Five entries changed status

All five moved the same way, from Non-compliant to Compliant. Four belong to one brand:

  • THUNE/21748/V1/A1 — “Thunder Bolt 460W (Flat Roof)”
  • THUNE/21749/V1/A1 — “Thunder Bolt 920W (Flat Roof)”
  • THUNE/21750/V1/A1 — “Thunder Bolt Max 530W”
  • THUNE/21751/V1/A1 — “Thunder Bolt Max 530W (Flat Roof)”

Those four were added to the register on 5 October as Non-compliant and were Compliant two days later. Their references gained an /A1 suffix in the process, which is worth noting: the reference you wrote down last week may not be the reference today. Thunder Energy now has six Compliant entries, alongside its original “Thunder Bolt 460W” (THUNE/21203/V1) and “Thunder Bolt 920W” (THUNE/21204/V1).

The fifth is SMITH/21648/V1/A2, “SolarGo-One 435”, from the electrical wholesaler Smith Bros. That change is what took the number of suppliers with a compliant kit from 25 to 26.

One entry disappeared

The Solen Energy UK entry we recorded on 5 October — SOLEO/21743/V1/A1, a kit pairing a Hoymiles HMS-800-2WB with two Longi panels — is no longer on the register. It was Non-compliant when we saw it, and now it is not there at all.

We do not know why, and we are not going to speculate. The point for a buyer is simply that an entry is not a permanent record. It can be added, change status in either direction, be amended, or be withdrawn.

Also changed

  • A new supplier, not yet compliant. HEPA Solar, a German maker, appears for the first time with one Non-compliant entry, HEPAS/21725/V1, “HEPA Premium 880”.
  • Two amendments. Voltacon’s two Non-compliant entries were amended to /A3 references, and their model strings now name the panels: “JA Solar 465W Microinverter Voltacon BYM500” and “JA Solar Max 930W + Microinverter HMS-800-2WB”. Both are still Non-compliant.

What it means for UK buyers

  • Check on the day you buy, not the week before. Five statuses changed and one entry vanished in 48 hours. A kit that looked unusable on Sunday may be fine today — and the reverse is possible too.
  • Match the reference and the model string, not the brand. Thunder Energy has six Compliant entries, but they are six specific kits. The register distinguishes “Thunder Bolt 460W” from “Thunder Bolt 460W (Flat Roof)”.
  • Watch for the suffix. References gain /A1, /A2 and /A3 parts as entries are amended. If a seller quotes a reference that no longer resolves, ask for the current one rather than assuming the worst.
  • Non-compliant still does not mean failed. On this register it means the ENA is waiting for information it needs. These five moves are what that looks like when the information arrives.

Every kit the register marks Compliant, by brand with its reference and the date we checked, is in our ENA register list. For who actually sells them, see where to buy plug-in solar kits.

Sources

  1. 1. ENA Type Test Register (ENA Connect Direct) — “Plug-in Solar” device type, read first-hand — Energy Networks Association, 7 October 2026
  2. 2. Plug-in Solar Device Interim Product Specification, version 2.0 — Department for Energy Security and Net Zero, 16 July 2026

Read the full guide

Where the UK rules stand

Plug-in solar has been legal to use in Great Britain since 27 August 2026, when SI 2026/848 came into force alongside Ofgem-approved changes to the G98 connection code — provided the kit is listed as compliant on the ENA Type Test Register. Northern Ireland is not covered. See the current legal status and our editorial policy.

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