Count the battery as generation
A battery inverter adds to the per-phase total just like a PV inverter. Adding storage to an existing G98 site is the classic way to end up needing G99 without noticing.
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G99 application checklist for solar PV and battery installers
A checklist for installers preparing a G99 grid-connection application: which route applies, what to gather, what to attach, and each DNO step through to commissioning confirmation.
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- 5
- Sections
- 33
- Fields
- 10
- Field types
integrioForm
Template
G99 application checklist
Project and site *
Supply *
Single phaseThree phase
Export limitation scheme (G100) needed? *
YesNo
Customer (the Generator) name and contact *
DNO *
National Grid Electricity Distribution ▾
Checked by *
Next section →
What do you need for a G99 application?
For a G99 application you need the customer and site details, the total AC rating of all generation and storage per phase, existing MPANs and connection agreements, a single line diagram, equipment details with type test references, import and export requirements, and a target commissioning date. Forms go to the local DNO, not to ENA.
Last updated . Facts checked on 30 September 2026 against ENA: Connecting commercial generation to the electricity networks and ENA: Connection of Power Generating Modules to DNO Distribution Networks in accordance with EREC G99 (v9, October 2022).
Who uses it
Installers' project managers and design engineers preparing the grid-connection paperwork for a commercial PV or battery job.
When
At design stage, before the application goes to the DNO, then kept open until the DNO has confirmed commissioning.
In Integrio
Build it once in the Form Builder (Office User), attach it to projects, and your team fills it in on iOS or Android, offline if needed.
Free template · integrio.app/forms/g99-application-checklist/G99 application checklist for solar PV and battery installers
A checklist for installers preparing a G99 grid-connection application: which route applies, what to gather, what to attach, and each DNO step through to commissioning confirmation.
| Project | Site | Completed by | Date |
The template
What's in the g99 application checklist?
5 sections and 33 fields. Copy them into any format, print this page, or set the form up in Integrio.
1.G98 or G99?
Add up every inverter on the site, including batteries, before choosing the route.
- 1.1Text
Project and siteRequired
- 1.2Choose any
TechnologyRequired
- Solar PV
- Battery storage
- Other generation
- 1.3Choose one
SupplyRequired
- Single phase
- Three phase
- 1.4Reading
Total AC rating of all generation and storageRequired(A per phase)
Aggregate, including existing generation. Above 16 A per phase, G99 applies.
- 1.5Choose one
Connection routeRequired
- G98: install, then notify the DNO
- G99 fast track (Form A1-2)
- G99 up to 17 kW single phase / 50 kW three phase (Form A1-1)
- G99 standard application form
- 1.6Yes / No
Export limitation scheme (G100) needed?Required
- Yes
- No
- 1.1
2.Site and customer information
Mostly Part 1 of the G99 standard application form. Get it from the customer early.
- 2.1Text
Customer (the Generator) name and contactRequired
The customer is the Generator on the form, even for a battery-only site.
- 2.2File upload
Site boundary plan (1:500) or postal addressRequired
- 2.3Text
Existing import MPANRequired
- 2.4Text
Existing export MPAN
Leave blank if there is no export meter yet.
- 2.5Notes
Existing connection agreements or generation on site
- 2.6Date
Target commissioning dateRequired
- 2.1
3.Equipment and attachments
- 3.1Notes
Inverter / PCE make, model and quantityRequired
- 3.2Text
Type test reference numbersRequired
From the ENA register or the manufacturer's verification report.
- 3.3Text
Battery make, model and usable capacity
↳ Shown when Technology includes Battery storage
- 3.4Choose one
Interface protectionRequired
- Integral to type-tested inverters
- Separate G99 protection relay
- 3.5File upload
Single line diagramRequired
- 3.6File upload
Datasheets and type test certificatesRequired
- 3.7File upload
G100 export limitation details
↳ Shown when Export limitation scheme is Yes
- 3.1
4.DNO submission and offer
- 4.1Dropdown
DNORequired
- National Grid Electricity Distribution
- UK Power Networks
- Northern Powergrid
- Electricity North West
- SP Energy Networks
- Scottish and Southern Electricity Networks
- Northern Ireland Electricity Networks
- Independent DNO (IDNO)
- 4.2Choose one
Submitted via
- ENA Connect Direct
- DNO portal
- 4.3Date
Date submittedRequired
- 4.4Text
DNO referenceRequired
- 4.5Choose one
Quote type requested
↳ Shown when Connection route is G99 standard application form
- Budget estimate
- Formal quote
- 4.6Yes / No
Connection offer received and accepted?
- Yes
- No
- 4.7Notes
Conditions in the offer
Export limit, reinforcement works, dates, extra data (Part 4 or 5) requested.
↳ Shown when Connection offer received and accepted is Yes
- 4.1
5.Commissioning and DNO confirmation
- 5.1Choose one
Will the DNO witness the tests?Required
- Yes
- No
- Not confirmed yet
- 5.2Date
Witness test date
↳ Shown when Will the DNO witness the tests is Yes
- 5.3Date
Commissioning dateRequired
- 5.4File upload
Commissioning test recordsRequired
Attach the PV and battery commissioning sheets.
- 5.5Date
Date commissioning confirmation sent to the DNORequired
Fast track and G98: within 28 days of commissioning.
- 5.6Yes / No
Final Operational Notification received
Types B, C and D (1 MW and above) cannot run in parallel without it.
- Yes
- No
- 5.7Signature
Checked byRequired
- 5.1
G99 application checklist from Integrio, free to use and adapt. Run it on phones, offline, with photos and signatures: integrio.app · Free 7-day trial, no credit card required.
From the field
How do you get the most from a g99 application checklist?
Chase the MPANs on day one
The import MPAN, any export MPAN and details of existing connection agreements come from the customer, and they are the items most often still missing when the drawings are finished.
Put type test references on the form
Where inverters or protection are type tested, quoting the reference numbers lets the DNO check compliance without asking for it at site. Keep the certificates with the job.
Book commissioning inside the window
On fast track, the planned commissioning date has to sit between 10 working days and three months after you apply. Schedule the crew and the pallet deliveries to that date, not the other way round.
When does G98 apply instead of G99?
+
ENA says G98 applies to generation under 3.68 kW per phase (16 A) and G99 above it. MIS 3002 makes clear the threshold is the aggregate AC output of all generators on the supply, so a 3 kW PV system plus a 3 kW battery on one single-phase supply needs G99. Under G98 you install first and notify the DNO within 28 days.
Sources: ENA: Connecting commercial generation to the electricity networks, MCS: MIS 3002 Issue 6.0, The Solar PV Installation Standard (18/03/2026), Electricity North West: EREC G98 & EREC G99 frequently asked questions
What is the G99 fast-track process?
+
Since 9 November 2022, small single installations whose aggregate capacity, storage included, stays within 32 A or 60 A per phase (depending on the procedure), all on fully type-tested inverters that won't run on loss of mains, can apply on Form A1-2. Commissioning must be planned 10 working days to three months after applying, and confirmed on Form A3-2 within 28 days.
Source: ENA: Connecting commercial generation to the electricity networks
Will the DNO witness my commissioning tests?
+
Sometimes. The installer carries out the tests, and the DNO may choose to witness them, for a fee. Which tests are witnessed depends on what type tests, manufacturer data and studies have already proved. Type-tested interface protection can remove the need, although on-site function tests are still needed if the protection was type tested on its own.
Sources: National Grid Electricity Distribution: G99 connection procedures, Electricity North West: EREC G98 & EREC G99 frequently asked questions
Can Integrio submit the G99 application for me?
+
No. Integrio does not submit G98 or G99 applications or talk to DNOs. Applications go to your local DNO, directly or through ENA Connect Direct, which is free for installers. Integrio holds this checklist, the attachments and the dates against the project, and a workflow can start the next task when a step is done.
Source: ENA: ENA Connect Direct
Is this G99 application checklist free?
+
Yes. Copy the fields into your own checklist or spreadsheet, or set it up in Integrio so every commercial PV and battery job follows the same steps.
How do I use this template in Integrio?
+
Build it in the Integrio Form Builder, which is on the Office User plan (£65 per user per month), and attach it to the project so each job follows the same steps. Anyone on the Field Service User plan (£15 per user per month) can fill it in on the mobile app, offline if needed, with file uploads and signatures.
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