How much does commercial solar cost per kW?

DESNZ's 2025/26 data puts non-domestic 10–50 kW systems at a mean of £1,167.29 per kW of installed capacity, across 5,163 installs in Great Britain. DESNZ publishes no band above 50 kW, so larger systems are priced on quotes.

Do I need planning permission for solar on a commercial roof?

Often not in England. Class J of the GPDO allows roof solar on non-domestic buildings within height and edge limits, and the old 1 MW cap was removed in December 2023. Systems over 50 kW need prior approval from the council first. Listed buildings and scheduled monuments are excluded.

Can I put solar canopies over my car park?

In England, Class OA permits solar canopies over non-domestic off-street parking up to 4 m high, at least 10 m from homes, after prior approval of siting, design and glare.

Does my business system need a G99 application?

Almost certainly. G98 only covers up to 16 A per phase. Above that, the installer applies to your DNO under G99 before installation, sometimes through the fast track.

What if the grid cannot take all my export?

An export limitation scheme built to EREC G100 can cap export to what the DNO allows. The scheme must be fail-safe, and it is applied for alongside the G99 forms.

Can a business get paid for exported solar electricity?

Yes. The Smart Export Guarantee covers solar PV up to 5 MW in Great Britain. Suppliers set the rate, which must be above zero, so compare offers.

A power purchase agreement in which a third party owns and runs the system on your site and you buy its electricity at an agreed price. Kilowatts compares installation quotes and makes no recommendation on PPAs.

Does Kilowatts install commercial solar?

No. Kilowatts UK is a comparison service; independent partner installers survey, price and install, and you contract with the one you choose. Commercial quotes are available UK-wide.

Commercial

Commercial battery storage ROI calculator

Work out battery payback for an office or other small commercial site from the unit rates on the bill.

Commercial here is the overlap between home storage and smaller industrial storage. The list includes home batteries, because those are the ones that suit offices and SMEs, plus any small industrial batteries in the shop.

Battery savings, one question at a time

Tell us about your energy supply and we'll take it from there. We'll only ask what we need.

Supply and usage

Is this a home or business supply?

Electricity region

Your electricity meter

Pricing profile for this tariff

Annual electricity imported from the grid (kWh), including EV charging at this meter

Is this measured or estimated?

Does annual use mean grid import or total site demand?

Site and equipment

Do you have solar panels?

Solar generation (kWh/year, if known)

Electricity exported (kWh/year, if known)

Do you have a battery?

Existing battery usable capacity (kWh)

Do you have an EV?

EV charging (kWh/year, if known)

Does annual electricity use already include EV charging?

Evening/overnight share of site use (%, if known or estimated)

Annual gas use (kWh/year, if known)

Current tariff and bill

Paste extracted bill details

Upload a PDF or photo of your bill, or paste details already extracted. Missing or unclear details stay as questions for you to answer.

Bill PDF or photo

Paste extracted bill JSON

How would you like to enter your current tariff?

Choose your supplier

Your current tariff

Matching tariff price

Supplier name if your tariff is not listed

Tariff name if your tariff is not listed

Current electricity standing charge (p/day)

Tax basis of the current electricity figures

Climate Change Levy basis (business)

Current annual electricity cost (£, if known)

Does current annual cost include export credit?

Current flat export rate (p/kWh, if known)

Keep this draft for my next sign-in (optional)

Optional MPAN / supply number from your electricity bill

Copy the boxes printed on your bill. The 13-digit core goes underneath the top line. Saved core digits stay masked.

Profile Class (2 digits) MTC (3 digits) LLFC (3 digits)

MPAN core (13 digits)

Period name

Fuel

Import or export

Unit rate (p/kWh)

From (HH:MM)

Until (HH:MM; 24:00 means midnight)

Use in this period (kWh/year, if known)

Rate tax basis

Weekdays, e.g. Mon Tue Wed Thu Fri Sat Sun

Commercial batteries coming soon

There are no batteries marked for commercial sites in the shop yet.

Choose another calculator

Live help

Need help right now?

Talk to RoboMo™ and get instant answers.