A standalone grid-services battery is a different class of project from a behind-the-meter installation: it exists to earn, not to cut a site’s own bill. Longer durations are increasingly specified as frequency-response markets fill up, and the asset is usually developer- or fund-backed, with the landowner leasing the compound.
The delivery scope is correspondingly larger. Planning permission (and above the relevant thresholds an Environmental Impact Assessment) is required, along with fire-and-rescue consultation under NFCC guidance, an HV or transmission connection agreement, and NESO market accreditation with the metering and response-speed compliance that goes with it. This is heavy civil, electrical and consenting engineering.
How Standalone Grid-Services Install is delivered
Delivery normally runs: site and grid feasibility; planning and, where needed, EIA; HV connection design and agreement; civils and the HV switching compound; container or skid installation at scale; protection, SCADA and market metering; NESO accreditation and witnessed commissioning across the traded services.
What this installation includes
- Front-of-meter or large behind-the-meter asset built to trade frequency response, the Balancing Mechanism, and wholesale arbitrage
- Full planning, HV connection, and NESO market accreditation as part of the delivery scope
- Longer durations increasingly specified as frequency-response markets fill
- Typically developer- or fund-backed; landowners lease the compound
Typical standalone grid-services install
- Power / capacity
- 1 MW / 2 MWh-20 MW / 40+ MWh
- Siting
- ground-mount compound
- Published cost range
- About £140–£240 per kWh for the battery, plus grid works
Cost, funding and how it is paid for
Standalone grid-services batteries are containerised and large: at the published £140–£240 per kWh for containerised systems, 2 MWh works out at roughly £280,000–£480,000 before grid works. At this scale the connection, substation and any reinforcement can add substantially, so the connection offer should be priced before the battery. As plant and machinery, a standalone grid-services install can qualify for the Annual Investment Allowance, which gives 100% relief on up to £1m of qualifying spend a year; above that, the treatment depends on how the battery is classified, so confirm it with your adviser. The 0% VAT relief (to 31 March 2027) covers only residential or relevant-charitable buildings. These are published budget ranges, not quotes: the cost guide gives the sources. See also capital allowances and grants and funding.
Fire safety, siting and compliance
Siting at this scale follows NFCC guidance for fire and rescue services: consultation, separation distances, firefighting water and access, and detection and venting engineered into the compound layout, alongside the IET Code of Practice and BS EN/IEC 62933 system safety.
Full planning permission and, above NSIP thresholds, an Environmental Impact Assessment. NFCC grid-scale BESS planning guidance and fire-and-rescue consultation. Transmission/distribution connection agreement; G99 where DNO-connected. NESO market accreditation, metering, and response-speed compliance.
Which standards apply, and what each one covers, is set out in the commercial battery fire safety guide.
Grid connection and commissioning
For a standalone grid-services install, the DNO is the critical path. The G99 application should go in at survey stage, with a G100 limitation scheme proposed where the network is constrained, and the half-hourly metering designed so that the control strategy and settlement are correct. A proper installation ends with documented battery storage commissioning and an O&M handover pack. Read an independent view on whether it is worth it.
Standalone Grid-Services Install: at a glance
| Attribute | Typical for this installation |
|---|---|
| Power / capacity | 1 MW / 2 MWh-20 MW / 40+ MWh |
| Siting | ground-mount compound |
| Published cost range | About £140–£240 per kWh for the battery, plus grid works (sources) |
| Connection | G99 (G100 limitation where constrained) |
Request installer quotes: Standalone Grid-Services Install
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- 1. Tell us about the site: what you want the battery to do, your supply, and any half-hourly data you have.
- 2. Your enquiry is passed to installers who cover your area. This site is not one of them and takes no part in the work.
- 3. Compare what comes back against the installer checklist before you commit to a survey.
Common questions
Can a battery be retrofitted to existing commercial solar?
Yes. The battery should be sized to the measured daytime export surplus, then AC- or DC-coupled to the existing inverter and metering. A G99 variation (or new application) is usually needed for the added storage, with G100 limitation to stay within the existing agreed export capacity. How much more of the solar output is used on site depends on the surplus and the load profile, so ask for the estimate to be worked from your own half-hourly data.
Do we need planning permission to install a commercial battery?
It depends on the size and siting of the enclosure and on where the site is: England, Wales and Scotland have different planning rules, and listed-building or conservation-area constraints can apply. Larger containerised and standalone systems increasingly need full planning permission and fire-and-rescue consultation under NFCC guidance, with attention to separation, access and noise. Confirm the route with the local planning authority before any plant is ordered.
What is a G100 limitation scheme and when is one used?
G100 is the Energy Networks Association engineering recommendation for customer export (and import) limitation schemes that hold a site within its agreed import/export capacity. It is used where the DNO connection is constrained: it can let a battery, and often new EV charging or production load, connect and operate without waiting for a network reinforcement, if the DNO accepts it. The limitation and its protection should be tested and demonstrated at commissioning.
What certifications should a commercial battery installer hold?
Ask for competent-person registration (NICEIC, NAPIT or ELECSA, searchable on one register), MCS certification where it applies to your system and its size, and evidence of G99/G100 applications taken through your DNO. Check that the design follows the IET Code of Practice for Electrical Energy Storage Systems and BS EN/IEC 62619/62933. For container and larger installs, ask who takes the CDM 2015 principal-contractor role. Asking to see a commissioning pack and a fire risk assessment from a comparable job is a good test.
How is half-hourly metering set up for a battery install?
Behind-the-meter control and settlement depend on accurate half-hourly measurement. The CT and metering arrangement should let the control system see site import, export, generation and the battery correctly, and any meter change is coordinated with the supplier or meter operator. Getting the measurement design right at installation is what makes peak-shaving and G100 limitation work in service.