Quick read. Form A is the pre-install application (only needed if you are running multiple micro-generators across one site). Form B is the post-install commissioning notification, one per premises, submitted within 28 days of energising. Most UK plug-in solar installs only need Form B. The compliant submission route in 2026 is the ENA Connect Direct platform, with a fallback to your DNO's own portal where they have one.

1. Which form do you actually need?

EREC G98 covers small generators up to 16A per phase per installation. For a typical UK 800W plug-in solar kit on a single phase you are well inside that.

Form A. Pre-install application. Required when you are connecting multiple micro-generating installations under one development. A single domestic install does not normally need Form A.
Form B. Installation document. Required for every premises after the install is commissioned. This is the form your installer fills in and you submit to your DNO. This is the one you almost certainly need.

Both forms are published by the Energy Networks Association (ENA) and can be submitted through the ENA Connect Direct platform.

2. Download the official forms

EREC G98 Form A: Pre-install application

Use only if you are connecting multiple micro-generating installations under one development. Submit before installation.

Download Form A (DOCX)

EREC G98 Form B: Installation document

Use after each Micro-generator installation is complete. One per premises. Submit within 28 days of commissioning under the connect-and-notify route.

Download Form B (DOCX)

The canonical source for both forms is the ENA Industry Hub Resource Library. Always cross-check the version date in the file header against the ENA's latest revision.

3. Form B field walkthrough

Most UK plug-in solar customers only need Form B. The fields below are the ones on the official ENA template.

Customer Details (your details)

Customer (name)The name on the energy account at the property. If the property is rented, the tenant's name is normally fine, but check your tenancy agreement, some landlords require their name on G98 submissions.
AddressFull installation address. Must match the address on file with your DNO and energy supplier.
Post CodeUK postcode for the install address. Used by Connect Direct to route the submission to the correct DNO automatically.
Contact personOnly if different from the customer. For a domestic install this is usually blank.
Telephone numberA phone number the DNO can use if they have a follow-up question. Mobile is fine.
E-mail addressAn email you actually monitor. The DNO confirmation will arrive here.
Customer signatureYour signature, ideally electronic if submitting through Connect Direct. A scanned or photographed signature on the DOCX is acceptable for many DNOs but verify on their portal.

Installer Details (your CPS-certified electrician)

InstallerThe electrical contractor's company name. Must match their CPS certificate (NICEIC, NAPIT, ELECSA, Stroma, etc.).
Accreditation / QualificationCPS scheme name and the installer's registration number. For example, NICEIC, registration 12345. Your installer fills this in.
AddressInstaller's business address.
Post CodeInstaller's business postcode.
Contact personNamed electrician at the installer's office. Usually the lead electrician on the install.
Telephone NumberInstaller's office number. The DNO contacts this number if there is a question about the install rather than the customer.
E-mail addressInstaller's business email.
Installer signatureThe lead electrician signs to confirm the install conforms to EREC G98.

Installation details

AddressSame as the customer address above unless the installation is at a different premises.
Post CodeSame as customer postcode.
MPAN(s)Your Meter Point Administration Number. 21-digit number printed on your electricity bill (sometimes called "Supply Number" or "S Number"). If you cannot find it, your supplier or ENA's network operator finder can give it to you.
Location within Customer's InstallationWhere the microinverter physically sits. Examples: "Balcony, north-east elevation", "External wall, south-facing", "Garden shed roof". Helps a future engineer find it.
Location of Lockable Isolation SwitchWhere the AC isolator is. For a hardwired plug-in solar install this is typically "Adjacent to consumer unit" or "Within meter cupboard". Required by BS 7671 Section 712 for PV installs.

Micro-generator details (the kit itself)

One row per generator. Use a separate line for new and existing installations. Use PH 1 column for single phase supply.

ManufacturerInverter manufacturer name. For UK plug-in solar this is usually Hoymiles, EcoFlow, Deye or Enphase. See Microinverters UK for the four main UK options.
Date of InstallationThe date the system was commissioned (energised). Form B must be submitted within 28 days of this date.
Energy source and energy conversion technology codesFrom Tables 1 and 2 in the form. For plug-in solar this is normally Solar PV (T1) + Static Inverter (T2). Your installer fills these.
Manufacturer's Ref NoCritical field. This is the number registered on the ENA Type-Test register for your specific inverter SKU. Mind the suffix: HMS-800W-2T is not the same as HMS-800W. If the SKU is not on the register, the DNO can refuse the G98 submission and the install reverts to the longer G99 route. Verify before installing.
Micro-generator Registered Capacity in kWAC export rating in kW at 230V. For an 800W kit, enter 0.8 in the PH1 column. Round to one decimal place per the form's instructions.
Energy storage capacity for Electricity Storage devices (kWh)Battery capacity if the kit includes one. For an EcoFlow Stream Pro this is 1.92. Leave blank for panels-only kits like the EcoFlow STREAM 800W or a Hoymiles + 2 panels combo.
PH1, PH2, PH3Three-phase notation. Most UK domestic installs are single-phase, so use PH1 only. Three-phase appears almost exclusively in commercial premises or rural smallholdings.

The Installer's Declaration

The form ends with a declaration by the installer that "the relevant Micro-generators and the installation which together form a Micro-generating Plant within the scope of EREC G98 at the above address, conform to the requirements of EREC G98." Your CPS electrician signs and dates this. They also enclose a system schematic, which is the drawing showing how the panels, inverter, isolator and consumer unit connect together. A copy is left at your incoming meter location.

Connect Direct photo requirement. If you are submitting through the ENA Connect Direct platform, a clear photograph of your cut-out (the sealed unit where the supply enters your home, before the meter) must be included with the submission. The DNO uses it to verify the cut-out is suitable for backfeed. Your installer should take the photo on the day.

4. Submit through Connect Direct (or your DNO's portal)

Connect Direct is the ENA's national platform for G98 connect-and-notify submissions. Most UK DNOs accept submissions through it, and many require it.

Primary submission route: connect-direct.energynetworks.org

If your installer prefers a DNO-specific portal, find the right one for your install address below. The DNO is determined by your install postcode, not your energy supplier.

Find your DNO and the right portal

UK Power Networks

London, East England, South East England

Open UKPN G98 portal →

National Grid Electricity Distribution

West Midlands, East Midlands, South West England, South Wales

Open NGED Connect & Notify →

Northern Powergrid

Yorkshire, North East England, North Lincolnshire

Open Northern Powergrid connections →

Electricity North West

North West England (Manchester, Cumbria, Lancashire)

Open ENWL generation page →

SP Energy Networks

Central and southern Scotland, North Wales, Merseyside, Cheshire, Shropshire

Open SPEN generation connections →

SSEN (Scottish & Southern Electricity Networks)

North of Scotland, South of England (Wessex, Solent)

Open SSEN generation page →

Not sure which DNO covers your postcode? The ENA's find-my-network-operator tool resolves it from your postcode in one step.

5. Common rejection reasons (and how to avoid them)

Inverter SKU not on the ENA G98 register. The DNO is allowed to refuse and route you to G99. Always verify the exact SKU before purchase, and capture the manufacturer's reference number for the form. See Microinverters UK.
MPAN missing or wrong. The 21-digit Supply Number from your bill, not your account number or your meter serial.
System schematic missing. Your installer must produce a one-page schematic showing the PV panels, microinverter, AC isolator, and the connection point on your consumer unit. A copy stays at the meter.
Photo of the cut-out missing. Required for Connect Direct submissions. Your installer takes it on the day.
Submission outside the 28-day window. Connect-and-notify is a post-install notification, but it has a 28-day clock from the date of energising. Late submissions are accepted by most DNOs but may flag for review.
Customer signature missing. Form B requires both customer and installer signatures. A scan or electronic signature is fine if the DNO portal accepts it.

6. After you submit

The DNO logs the install on its asset register and writes back to confirm receipt, usually by email within 10 working days. Keep that confirmation with your install certificate, your buildings insurance documents, and the system schematic. Future EICR inspections, home insurance claims, and the conveyancing for any future house sale will reference these documents.

Important: G98 is not legal advice and the form is not a substitute for the BS 7671 install certificate (Minor Works or EIC). Both are required: the install certificate is what your CPS electrician produces; the G98 form is what the DNO needs. They are separate documents that often confuse new buyers.

7. Related reading

G98 / DNO Guide: conceptual primer on what G98 is and why DNOs require it.
Microinverters UK: the four UK-available microinverters and how to verify each on the ENA G98 register.
BS 7671 and Plug-In Solar in the UK: the wiring-installation rules that sit alongside G98.
BSI 2026 Standards Tracker: how the BSI plug-in solar product standard fits with BS 7671 and BS 1363.