UK Government Plug-in Solar March 2026 Announcement: Full Summary

In March 2026, the UK government made an unambiguous statement: plug-in solar is legal, safe, and here to stay. After months of consultation and technical development, the Department for Energy Security and Net Zero formally declared its support for domestic plug-in solar systems and set a clear regulatory timeline. But what does this announcement actually mean for your home, and when can you actually buy a compliant kit?

What the Government Actually Announced

The government's March 2026 statement confirmed:

1. Plug-in solar is "generally safe" for domestic use — moving the category from experimental to established technology
2. BS 7671 Amendment 4 would be published immediately — providing the electrical installation guidance needed to make plug-in systems legal under UK building regulations
3. An 800W AC regulatory cap — set at the socket outlet level to protect DNO networks
4. G98 micro-generation notification — existing framework extended to plug-in solar, with 28-day filing requirement
5. A July 2026 target for the BSI product standard — the technical specification that manufacturers will build to

In one crucial sentence, the government reframed plug-in solar from "something that might be allowed" to "something we are actively supporting."

The Timeline: What Happened (and What's Next)

March 2026: Government Announcement

✓ Completed — Government stated support, confirmed 800W cap, extended G98 notification

April 2026: BS 7671 Amendment 4

✓ Completed — Published within one month of announcement, now the legal standard for plug-in solar installation in England, Scotland, Wales, and Northern Ireland

BS 7671 Amendment 4 clarified:

• Supply-side cabling and disconnection
• Socket outlet suitability
• Earthing and bonding
• Protection against overload and shock
• Labelling and safety notices

July 2026: BSI Product Standard (Expected)

⏳ Pending — The formal product standard defining safe inverter design, panel mounting, connector types, and safety systems

This is the document that manufacturers have been waiting for. Once published, companies like EcoFlow, Anker, and others will immediately certify their plug-in solar kits against it.

Late Summer 2026: Retail Availability (Expected)

⏳ Pending — First compliant kits arriving in UK shops and online retailers

The 800W Cap Explained

The 800W cap is a circuit-level maximum, not a household-level cap. Here's what it means:

• You cannot exceed 800W AC output per 13A socket outlet
• You can have multiple systems on different circuits (each with its own 800W limit and G98 notification)
• The limit applies to AC output from your inverter, not the DC panel capacity
• Oversizing the DC side (e.g., 4 panels feeding one 800W inverter) is allowed and beneficial

A typical 2-panel kit will produce 800W AC at peak, making maximum use of this allowance.

G98 Notification: The Legal Requirement

Plug-in solar systems must be notified to your DNO using the existing G98 form (Micro-generation Certification Scheme notification) within 28 days of installation.

Why G98 matters:

• Network safety — DNO knows what's connected to their network
• Fault protection — electrical safety systems work correctly with micro-generation in place
• Your legal protection — you've complied with building regulations and electricity safety standards

What to declare:

• System AC capacity (800W)
• Inverter make and model
• Panel specification
• Installation date
• Your address and contact details

Cost: Most DNOs charge £0–£50 for G98 processing. Many plug-in solar suppliers will handle this paperwork for you.

How This Compares to Germany

Germany legalized plug-in solar (Stecker-Solaranlage) in January 2024 without an AC cap, allowing installations up to 2 kW. However:

• Germany's homes have 230V single-phase supply — ours are typically 230V
• Their networks are more decentralised — less risk from small additions
• UK chose 800W as a conservative threshold — safer for our older distribution networks and easier to administer

The UK's 800W approach is simpler for homeowners and less likely to cause network stress.

What Still Needs to Happen

1. BSI Product Standard (July 2026 target)

Manufacturers need this standard to certify their designs. Until it's published, no "fully compliant" kit legally exists in the UK market. However, the government has indicated that products meeting temporary technical guidance can be sold once the standard is published.

2. Retail Availability & Pricing

Once the standard is live, expect:

• Initial pricing: £1,200–£2,000 for a 2-panel kit (inverter + 2×400W panels + cables)
• Long-term pricing: £800–£1,200 as supply chains mature (German pricing as reference)
• Where to buy: Online (Amazon, specialist retailers), and eventually major DIY chains

3. Installation Guidance

Whilst BS 7671 covers the electrical side, installation best practices (roof mounting, cable routing, labelling) will be clarified in manufacturer documentation and installer training.

4. Installer Network

As kits become available, expect a network of MCS-qualified or NAPIT-qualified installers ready to handle plug-in solar installations. DIY installation is permitted under current rules but must still comply with BS 7671 and G98.

What Early Adopters Should Know

If you're considering buying a kit from summer 2026 onwards:

1. Check BSI compliance — ensure the kit explicitly meets the 2026 BSI product standard
2. File G98 within 28 days — keep the DNO notification receipt as proof of compliance
3. Monitor with smart plugs — use TP-Link Tapo P110 smart plugs (~£15) to track real-time output and validate performance
4. Store documentation — keep invoices, G98 receipt, and electrical inspection records for future house sales
5. Consider battery backup — pair your kit with a battery like the EcoFlow STREAM (~£699) to maximise the benefit of generation in off-peak hours

Why This Announcement Matters

Before March 2026, plug-in solar lived in a grey area. Installers couldn't legally recommend it. Retailers couldn't safely stock it. Homeowners couldn't be certain they wouldn't face legal challenges.

Now:

• It's legal (confirmed by government)
• It's safe (BS 7671 Amendment 4 sets standards)
• It's coming to retail (July 2026 standard, late summer availability expected)
• It's regulated (G98 notification creates accountability)

What This Means for Your Home

If you've been waiting to invest in plug-in solar:

• Summer 2026: First kits will arrive; expect premium pricing
• Autumn 2026: Wider choice and potentially lower prices as supply increases
• 2027 onwards: Market stabilisation, mainstream availability, price maturity

For the latest on product availability and pricing, see our Plug-in Solar UK: What's Changed in 2026 and What's Coming Next. To understand the technical standards in detail, read our Complete Guide to BS 7671 Amendment 4 and Plug-in Solar.

This article reflects announcements and timelines as of April 2026. Follow DCMS and BSI updates for the latest on product standard publication.