Go green at home with Perenna & Octopus Energy

Average costs

The cost of installation can depend on how many panels you need, whether you choose to have battery storage, and what size of battery you require. The cost of a panel-only installation by Octopus starts from £4,100 (for 2 panels). A 10 panel installation and a 5kWh battery (our most popular system) costs £9,199. We'll ask you to pay a fully refundable deposit of £200 when you agree to your quote, then you’ll have the option to pay monthly with a fixed-term loan, or pay in full after installation.

Find out how long it takes for a solar system to pay for itself.

What does a standard installation include?

Your quote will be inclusive of your chosen number of solar panels and battery option, microinverters (if necessary), bird protection and all other electrical components required to complete the install. Plus scaffolding, delivery and labour costs, and our 5-star customer support from start to finish.

For an Octopus solar installation, you will need to own your home, and you will need a clear space on a pitched roof (aka not flat) that can fit at least 2 solar panels. See our FAQ on how much space you'll need for panel sizes.

Please note that we're not able to install solar for flats or properties with a 3 phase electricity meter just yet. And at present we are only able to install system systems on roofs with clay or concrete roof tiles.

It's important that this part of your roof sees the sun throughout the day, so a north facing roof will generate less power, and could be unsuitable. We'll also need to be able to install scaffolding below the roof where the panels will be fitted in order to complete the installation.

If Octopus are unable to install solar at your home, we may be able to recommend an Octopus Trusted Trader to complete the job for you, with equivalent care and quality.

If you'd prefer to spread the cost of your solar installation, we can connect you with DivideBuy. DivideBuy can arrange interest free loans over terms of 1, 2 and 3 years. Or over 5 or 7 years at a fixed interest rate of 9.9% APR. Loans are subject to terms and eligibility.

Check out our FAQs page for information on the application process and answers to common questions.

Representative example: 9.9% APR over 5 years
The cash price of the goods is £10,000.00. The total amount repayable is £12,506.36, which includes £2,506.36 in interest at 9.9% APR fixed over the loan term. The repayments comprise the first instalment of £167.06 (with no interest charged), followed by 58 monthly payments of £209.14 and a final payment of £209.18 at a representative 9.9% APR. The total amount of credit is £10,000.00.

Finance is offered through Zopa Bank Limited (company number: 10627575), trading as DivideBuy, which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority, firm reference number 800542. Zopa Bank Limited is incorporated in England and Wales and has its registered office at: 1st Floor, Cottons Centre, Tooley Street, London, SE1 2QG. VAT Number 281765280. DivideBuy's trading address is First Floor, Brunswick Court, Brunswick Street, Newcastle-under-Lyme, ST5 1HH. Octopus Energy Services Ltd is an appointed representative of Octopus Electric Vehicles Ltd and is a credit broker and not a lender. Octopus Electric Vehicles Limited is authorised and regulated by the Financial Conduct Authority, firm reference number 809736.

Together with your new air source heat pump, your quote will include:

• Installation & configuration by our expert team.
• A compatible hot water cylinder.
• Any necessary radiators.
• Plumbing & electrical bits needed to fit your new heating system.
• All delivery and labour required to complete the install.
• 8-year product warranty with a Cosy 6 heat pump, or 5-years for other brands.
• £7,500 Boiler Upgrade Scheme grant (we apply for this grant on your behalf).
• Free asbestos testing and Energy Performance Certificate (EPC) application if required.
• 2-year warranty on all other parts.
• 2-year warranty on labour & workmanship.
• A dedicated team to support with everything, from quote to installation and beyond.
• All work is completed to our design standard. If your home requires any extra work, this may come at an additional cost.

Get the full low-down on what's included.

To claim the BUS grant, you'll need to check off the following:

• You'll need to own your home.
• You'll need to have an EPC from the past 10 years. If you don't, no worries.
  We can arrange that for you.
• You'll need to check you have enough space for your new system. Check out our sizing guide here.
• If your home is undergoing renovation you'll need to wait until it's complete. In the meantime, here are some tips to help you on your way.

To find out more about the Boiler Upgrade Scheme check out this page.

Making home improvements is really exciting, and a heat pump could be the icing on the cake! If you’re planning to make structural changes (like knocking down a wall or adding an extension), you will need to wait for the renovation to be complete before we can begin designing your heat pump.

This is because big changes will alter the overall heat loss and thermal performance of your property. We tailor your heat pump design specifically to your home, so if the layout changes, the needs of your heat pump will too. This means your heat pump may end up being too small or less efficient, and cost you more money in the long run. Your heat pump may also no longer meet MCS requirements, which is needed for the government grant.

However, there are some things you can factor into your renovation plans now to get your home heat pump ready:

• Underfloor heating/ radiators - underfloor heating is the perfect partner for heat pumps or larger, higher output radiators to accommodate the lower flow temp. Just let your contractor know you're planning to match it with a heat pump and they'll find the right emitters for you.
• Pipework - you'll need a minimum pipe size of 15mm for a conventional heat pump. If you have smaller pipes, they can still work well but you may need a more bespoke system.
• Space - think about where you'll be placing your heat pump (outside) and water cylinder (inside) - the closer together, the better!
• Insulation - renovation can be a prime time to add more insulation to your property, which will make your heating more efficient (whatever system you have)

Please get back in touch once your renovation is structurally complete and we'll be happy to give you a heat pump quote.

Our heat pumps start at £500 for a standard installation (including the £7,500 government grant). For larger or more complex homes, costs will be higher, but even with that in mind, almost all our quotes are lower than the national average of £5,565.

All we need is a few details to generate a tailored quote for your home. We’ll use the info you give, as well as your home’s energy performance certificate (EPC) from the national database, to calculate your fixed price.

We'll be able to let you know exactly what you need and how much it costs, including necessary additional works after your no obligation home survey. Find out more about potential additional costs in the Cost, grants and savings section.

Nope! Anyone can get a survey and installation with us even if you’re not an Octopus Energy customer.

Interested in solar and battery installation?

Call us: 0808 196 6842

Email: solar@octopus.energy

(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday.)

Need support after installation?

Email: solar-aftercare@octopusenergy.services

(Our aftercare phone line is open 8am – 8pm Monday to Saturday, 10am - 6pm Sunday, and we answer emails 7 days a week)

Interested in buying a heat pump?

Call us: 0808 196 6842

Email: heat@octopus.energy

(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday.)

Check out our full complaints procedure here.

For the fastest response, fill out this form to raise any issues. Alternatively, you can email us on solar@octopus.energy or heat@octopus.energy

Or call 0808 196 6842.

If you require extra help with setting up your export tariff and supply, please email export@octopus.energy.

Check out our full complaints procedure here.

Please note, if you’re having problems with a solar system that wasn’t installed by us, please seek advice directly from the manufacturer.

Cut up to 91% off your electricity bills

We compared the annual cost a typical household would pay for their electricity on the July '24 price cap - £1,002, to what they would pay with a 10 solar panel & 5kWh battery system (our most popular system) on our Octopus Flux tariff - £93. This is a saving of £909 or 91% of your total electricity bill.

In this table, you can check out the typical costs, savings and payback period for an average customer with our most popular system size (10 solar panel & 5kWh battery). Check out this blog for more on solar savings and a more detailed explanation of our calculation.

Solar installations from £4,100

Our prices start at £4,100 for a 2 panel installation with no battery.

The UK's most awarded energy supplier

We've won more awards for customer service than anyone else.

Cut carbon emissions by around 80% with a heat pump:

This is the typical reduction in heating carbon emissions using an electric powered heat pump compared to a gas boiler, based on the following calculation:
Gas CO2 = (A/C*D) = 2.35 tonnes per year
Electricity CO2 = (A/B*E) = 0.45 tonnes per year
Carbon saving = 1.9 tonnes or 82%

Where A - E are:
A - 9,250 MWh typical energy demand for a medium use property (according to Ofgem).
B - 3 heat pump seasonal coefficient of performance
C - new boiler efficiency of 82.5% (BEIS study)
D - Gas fuel emissions of 210 gCO2/kWh (SAP 10.2)
E - Electricity fuel emissions of 136 gCO2/kWh (SAP 10.2)

See our cost to run blog for the full set of calculations and assumptions.

Efficiency / A heat pump is up to 4x more efficient than a gas boiler:

Heat pumps can deliver several units of heat for each unit of electricity. For every 1 kWh of electricity you put in, you could get an average of 3.1kWh heat out, which is an efficiency of 310%! This is because heat pumps don't create heat, but move existing heat from nature into your home (like an air conditioner or refrigerator, but in reverse).

Alternatively, when you burn stuff to generate heat (like gas, oil, or wood), you are instead creating heat by converting matter to energy - so you can never get more than one unit of heat for each unit of energy you burn. Gas boilers in UK homes are only around 85.3% efficient, so for every 1 kWh of gas you put in, you get around 0.853kWh of heat out, which is nearly 4x less efficient than a heat pump (3.1/0.853 = 3.6).

These are typical install efficiencies as seen from government funded studies of gas boilers and heat pumps installed in real homes. Our own installations are typically higher efficiency than the ones shown in this study.

Heat pumps vs gas boilers

Lifespan: the expected lifespan of a gas boiler is 10-15 years, whereas a Daikin heat pump is expected to run for 15-20 years.
Heating costs: Check out our blog on heat pump running costs for a full breakdown of our running cost calculations.
Efficiency & emissions: See above

87% of our heat pump quotes beat the national average:

We compared all of our heat pump quotes for April to June 2024 to the UK national average installation cost, which government publish here every quarter. We found that 87% of our Octopus quotes were below the national average price of £5,321 (this includes the Boiler Upgrade Scheme grant of £7,500).

The UK's most awarded energy supplier

We've won more awards for customer service than anyone else.

Public liability insurance provider: QBE UK Limited.

Indemnity Limit: £10 million

Octopus Energy Services Ltd VAT number: 358672751