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Commercial solar feasibility

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Roof-to-meter study

The useful generation is the part the site can use.

Roof geometry and generation matter, but the deciding comparison is with the site's own daytime demand.

13:00

Generation peaks above demand. The surplus is exported at the export rate, not the grid price.

GenerationSite demand

The cheapest energy is the energy you don't use

Know whether solar pays for itself before anything is specified.

Modelled from your own consumption and your own contracted rates, with the answer given in writing either way.

  • Modelled from your own data

    The feasibility model uses your consumption and your contracted rates, not a generic profile.

  • Self-consumption tested

    The variable that actually decides the return is tested specifically, not assumed.

  • A written answer either way

    Where it does not stack up, that is the finding, and the option is dropped in writing.

  • Funding route tested

    How a system would be funded is tested before anything is specified.

Where it goes wrong, and what we do about it

  • How Omnium solves it

    The model is built from your own consumption data and your own contracted rates, not a generic profile.

  • How Omnium solves it

    We test self-consumption specifically, because a unit you use yourself avoids the full delivered grid price while an exported unit earns only the export rate, and that difference decides whether the system pays for itself.

  • How Omnium solves it

    Feasibility is tested first, and where it does not stack up, that is the finding and the option is dropped, in writing.

Read moreThe detail, in full

In short

Solar feasibility tests whether a system would pay for itself on your site before anything is specified. The deciding variable is self-consumption: a unit you use yourself avoids the full delivered grid price, while an exported unit earns only the export rate. The model is built from your own consumption and your own contracted rates, and the answer is given in writing either way.

What this does not do. A study does not reduce a bill on its own, and solar is not right for every site. Where it does not stack up, that is the finding and the option is dropped.

The first review across your invoices costs nothing. Later work is quoted and agreed in writing before it begins. Cost recovery

Solar is not right for every site.

Where the roof, the load and the funding do not line up, that is the finding and the option is dropped. A feasibility study does not reduce a bill on its own.

  • 01

    Your half-hourly or AMR consumption, because how much of the generation you would use yourself decides the economics.

  • 02

    The roof or ground area, its orientation, pitch and shading, against generation in UK conditions.

  • 03

    Your contracted rates, since a self-consumed unit avoids the delivered grid price you actually pay, not a national average.

  • 04

    The three funding routes: outright purchase, finance, and a Power Purchase Agreement, each costed over its real term.

  • 05

    Export arrangements, where generation exceeds what the site can use, priced at the export rate rather than the grid price.

  1. The model starts from your own interval data, so the self-consumption share is measured rather than assumed.

  2. Roof area, orientation, pitch and shading are assessed against UK generation conditions.

  3. Purchase, finance and PPA are each costed over their real term, with the calculation and its assumptions shown.

  4. You receive a written answer. Where it does not stack up, that is the answer, and nothing proceeds until you say it should.

Questions

What clients ask before starting

How much of what you generate you use yourself. A self-consumed unit avoids the full delivered grid price, while an exported unit earns only the export rate. That single variable decides the economics more than the size of the roof does.

In the region of 900 to 1,000 kWh per kWp per year in UK conditions, varying with orientation, pitch, shading and location. The model for your site is built from your own consumption and your own contracted rates.

Three: buying the system outright, financing it, or a Power Purchase Agreement where a third party funds, installs and owns the system and you buy the power it generates at an agreed rate, often over fifteen to twenty-five years. Each is costed and compared in the report.

Yes. Solar is not right for every site. Where the roof, the load and the funding do not line up, that is the finding, the option is dropped and we say why in writing.

Rarely. Solar typically covers a share of demand, and the valuable share is the part used on site. The report states what proportion of your consumption a system would realistically serve.

The first review, which establishes whether the site is worth modelling properly, costs nothing. The full feasibility work is quoted and agreed in writing before it starts.

Where this work has run

  • EV-07 / Carbon

    100 per cent renewable supply sourced and a solar PV design completed

    Act on Energy

    Work carried out on the charity's own premises under our partnership as their Official Commercial Energy Partner. The solar PV design is a completed design, not installed generation.

    Partnership summary, Omnium and Act on Energy, 27 August 2026

    Read the source record

Read the detail

Related: energy reduction, commercial energy audits and carbon reporting.

How to check this

Each claim on this page is answered by something you can read for yourself. Nothing below states a figure; it names the document or register the claim is held against.

  • Point 01

    We hold a Level 1 Letter of Authority only

    The authority wording sets out what we may do with your data and states that we cannot sign a contract on your behalf. Read it before you sign it.

    Read the Letter of Authority

  • Point 02

    How we are paid is agreed in writing before you sign

    Our margin or management fee is stated in the terms that accompany a recommendation, and nothing is added afterwards.

    Client terms and conditions

  • Point 03

    Every figure we quote carries a dated source document

    Records state the figure, what it is measured against, the document it is taken from and the date on that document. Records still held anonymous are labelled as such.

    Evidence records

  • Point 04

    Consumption figures come from meter and supplier data, not estimates

    Where a reading is estimated or missing, the record says so rather than filling the gap.

    How your bill is built up

  • Point 05

    We work to a published code of conduct

    Our obligations as a third party intermediary, and what you can hold us to, are set out in full.

    Third party intermediary code

Ask about our services and accreditations

Put a supplier assessment question and get an answer drawn from what we already publish. It reads our service pages, compliance sheets and accreditation register, and nothing else.

Hello, I'm Omnium's AI assistant. I can answer questions about business energy, our services and how we work, or put you in touch with the team. What can I help with?

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Proof

What we have delivered, and who checks our work.

Each figure below is taken from our evidence record and has a full case study behind it.

  1. £206,000a year saved on procurement

    Read the case study: Michels and Taylor

  2. £161,000a year saved on gas, about £483,000 across a three-year term

    Read the case study: Broadening Choices for Older People

  3. Group rates10 per centlower than the previous brokered prices

    Read the case study: Roam

Checkable with the issuing body

All case studiesThe full evidence record