Multi-tenanted offices
Stand out to prospective tenants.★ 20%+ cheaper solar electricity*★ Fixed for 25 years
interAll / Smart Solar
Introducing free solar with decarbonisation experts.
(Yes, we really do mean free.)
Turn unused roof space into renewable electricity generated on site. For qualifying buildings, the equipment, design, installation, monitoring and maintenance are all included, with no upfront or separate ongoing solar-system charges.
Save at least 20% on your solar electricity from day one.*And lock in your solar rate for 25 years.
*For qualifying buildings. A minimum 20% initial saving applies to eligible on-site solar electricity compared with an agreed starting grid unit rate. The solar rate is fixed for 25 years; other electricity and charges remain separate. Subject to signed terms.
£0 upfront solar-system costs*
20%+ cheaper solar electricity from day one*
Solar rate fixed for 25 years
See the transformation
The same building. A smarter roof.
Whether you are retrofitting an existing property or planning a redevelopment or new build, we can assess how on-site solar could work for you.
Industrial, logistics & manufacturing
Put unused roof space to work. Reduce daytime electricity costs and enjoy long-term solar price certainty.
Assisted living & care homes
Take control of rising energy costs with monitored rooftop solar and a solar electricity rate fixed for 25 years.
Illustrations are conceptual. Site design, generation and energy savings depend on the building.
Illustrative cumulative savings or commercial value
What could 25 years of cheaper solar be worth?
For example, take £3,000 a month of electricity spend eligible for on-site solar. With a fixed solar rate and an illustrative 6% yearly rise in comparable grid prices, the cumulative benefit could be significant.
£3,000monthly eligible electricity spend today
6%assumed annual grid-price rise, not a forecast
25 yearsfixed solar unit-rate illustration
Potential cumulative savings - or commercial value to share
Total value across the period, not annual savings. Who receives that value depends on the agreed arrangement.
| Starting solar discount | 10 years | 15 years | 25 years |
|---|---|---|---|
| 20% | £186,509 | £405,935 | £1,255,122 |
| 30% | £222,509 | £459,935 | £1,345,122 |
| 40% | £258,509 | £513,935 | £1,435,122 |
| 60% | £330,509 | £621,935 | £1,615,122 |
Save it. Share it. Or explore a commercial return. The same solar advantage can benefit occupiers or support an agreed commercial landlord arrangement - not both at the full value.
Illustration only - not guaranteed savings or landlord profit. Assumes all £3,000/month of starting electricity unit charges could be displaced by solar, constant usage, a fixed solar rate and 6% annual grid price increases. Actual coverage and savings vary. Grid price increases are not a forecast. Other fees and charges are excluded. Values are cumulative, not annual.
Simple funding. Expert delivery.
How fully funded solar works.
interAll is your single technology partner: we consult, install, monitor, maintain and support your solar solution. Our funding partner covers the approved solar-system costs. Your solar electricity rate is fixed for 25 years.
Your technical partner
interAll
We consult, survey, design, coordinate installation, monitor and maintain your system, and remain your single technology partner for ongoing support.
Long-term funding & performance
Our funding partner
Our funding partner covers the approved system costs, owns the equipment and fixes your agreed solar electricity rate for 25 years.
You enjoy the benefit of lower-cost renewable electricity without purchasing the solar equipment or organising its maintenance. One specialist team. No equipment bill. No ongoing system-management fee.
01 / ASSESS
interAll consults & surveys
We assess the roof and daytime electricity use, advise on feasibility and design the right system - whether retrofit, redevelopment or construction-stage.
02 / AGREE
Landlord approves the roof
A suitable location is confirmed and the landlord agrees the necessary roof rights, typically for 25 years.
03 / FUND
Our funding partner pays & owns
Our funding partner pays for and owns the solar system. Your agreed solar rate is fixed for 25 years.
04 / DELIVER
interAll installs & supports
interAll manages the specialist installation, monitors performance, coordinates maintenance and provides ongoing technical support throughout the agreement.
20%+ cheaper*
Solar electricity from day one. Rate fixed for 25 years. No annual rises.
*Applies to eligible solar electricity against the agreed grid unit rate at the start. Other grid imports and charges remain separate. Subject to contract.
A better building for everyone
An energy upgrade with real commercial value.
At least 20% cheaper solar electricity from day one and a fixed solar rate for 25 years - without a major upfront system investment.
Landlords
A more attractive building for tenants. Pass the value on - or explore a commercial return.
Property managers
One expert technical partner overseeing the system, from installation through ongoing reporting and support.
Letting agents
Offer prospective tenants solar electricity at least 20% cheaper from day one, with the solar rate fixed for 25 years.
Facilities managers
Continuous monitoring, specialist maintenance and clearer energy-performance reporting.
Beyond generation
More than solar.
A decarbonisation programme.
Energy is the starting point. We connect buildings and their occupiers with the specialist knowledge, training and measurable insight to support longer-term environmental progress.
Decarbonisation strategy
Practical carbon reduction guidance, measurable energy data and access to specialists who can help buildings and occupiers make progress.
Carbon Literacy & training
Access to Carbon Literacy training and practical support so building teams and occupiers can turn environmental aims into informed action.
ESG, CSR & reporting
Monitoring data, biodiversity and community initiatives, and specialist support to strengthen your ESG, CSR and tender evidence.
Specialist partner network
Proximus Solutions
Solar installation and retrofit delivery
Solar installation and retrofit deliveryinterNature
Local carbon measurement and nature restoration
Local carbon measurement and nature restorationMoss Lane Ecological Solutions
Carbon Literacy training and practical CSR guidance
Carbon Literacy training and practical CSR guidanceMoss Lane FarmCommunity biodiversity, volunteering and nature projects
Partner marks are referenced from public sources where available. Approval and production-ready artwork are required before publication.
Supports wider building goals: on-site solar and measured energy data may help inform BREEAM, NABERS UK, EPC and ESG reporting. They do not automatically award ratings or certification. Extended training and advisory work are subject to separate agreed scopes where applicable.
Relevant to your wider building goals
Evidence for more than energy savings.
Measured on-site solar generation can help inform energy and carbon reporting, and may contribute evidence to building assessment and occupier sustainability programmes. It does not, by itself, award a certification.
BREEAMNABERS UKEPCESG & CSR
Common questions
Fully funded solar, explained.
Is the solar system really free?
Yes, for qualifying buildings there are no separate upfront solar-system charges or agreed ongoing system-maintenance fees. You pay for the solar electricity you use.
How much cheaper is the solar electricity?
At least 20% cheaper at the start, with the solar electricity rate fixed for 25 years, for qualifying buildings.
Can solar be fitted to an existing building?
Yes. Suitable roofs can be retrofitted, or solar can be designed into redevelopment and new construction.
Who installs and maintains the system?
interAll is your single technology partner, from initial consultation through installation, monitoring, maintenance and support.
How long is the agreement?
For qualifying buildings, the solar unit rate is fixed for 25 years, subject to the signed agreement.
Is my whole electricity bill fixed?
No. Only the eligible on-site solar electricity rate. Grid electricity and other charges are separate.
Are the savings in the example annual?
No. They are cumulative totals across 10, 15 or 25 years.
Which buildings qualify?
Suitable commercial, industrial and care-sector properties with roof capacity, daytime usage, the right permissions and approved funding terms.
Selected buildings only
Does your building qualify?
Qualifying buildings can access 20%+ cheaper solar electricity from day one, fixed for 25 years. We are happy to check your roof and advise.
Request a free suitability review →Our initial eligibility checks
- Suitable, usable roof with structural capacity
- Meaningful electricity demand during daylight hours
- Commercial, industrial or care-sector premises
- Landlord agreement and roof rights for around 25 years
- Acceptable technical, planning and funding assessment
Subject to technical, funding and contract approval. For qualifying sites, the solar electricity unit rate starts at least 20% below the agreed comparable grid unit rate and remains fixed for 25 years. The solar system carries no separate approved upfront or maintenance charges; solar and remaining grid electricity are payable. Whole-bill savings vary.