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On-site solar is generation on a roof, car park or land the business controls, used at that site first, with only surplus exported. The choice depends on whether you need fewer imported units at a specific meter, a price structure on volume you will still buy, or contractual evidence for a renewable electricity claim, and those outcomes do not move together. A funded array on the occupier's own roof is a site contract, not a remote corporate PPA, even if the funder uses the same label." } }, { "@type": "Question", "name": "Does a virtual PPA reduce the electricity a site imports?", "acceptedAnswer": { "@type": "Answer", "text": "No. A virtual PPA settles against a market reference and does not deliver power to the buyer's meters, so it does not by itself cut imported units or remove most non-commodity bill lines. A physical, or sleeved, PPA in Great Britain routes named output through a licensed supplier, with shaping and balancing costs on top of the generator's price. 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Exported surplus does not offset the same bill lines as an avoided import, and which non-energy charges fall depends on the tariff, the connection voltage and the rules then in force, so those lines should be read from the bill." } }, { "@type": "Question", "name": "Can a business use on-site solar and a corporate PPA together?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. On-site solar can cover roofs that work, and a corporate PPA can cover residual volume those sites will still import. The two routes do not do the same job. A virtual contract is not the answer to a warehouse roof question, and one rooftop array is not a hedge for the rest of a multi-site portfolio. The supply agreement remains either way, so a site closure, a change in shift pattern or a tenant leaving can still move volume you have committed." } }, { "@type": "Question", "name": "Does a corporate PPA or a rooftop array automatically support a renewable electricity claim?", "acceptedAnswer": { "@type": "Answer", "text": "No. A renewable attribute depends on the evidence included, commonly REGOs or an equivalent contractual instrument in Great Britain, not on the word PPA alone. A PPA does not provide that evidence unless the certificates are actually transferred. Holding REGOs does not by itself show that the deal caused new plant to be built. Panels on a roof do not automatically provide the reporting evidence a claim needs, so that requirement should be confirmed separately." } }, { "@type": "Question", "name": "When is a corporate PPA a better fit than more on-site solar?", "acceptedAnswer": { "@type": "Answer", "text": "A corporate PPA fits organisations that can commit a volume a generator and a supplier will actually contract, want a multi-year price structure, and need a route across sites they do not control. It is a weak fit for a small single site seeking a simple cut in imported units, or for a team that cannot manage credit support, accounting treatment and contract administration. There is no universal public floor for the smallest volume the market will accept. On a virtual deal, the settlement reference may not match the buyer's supply price, so a gap can remain even when annual totals look aligned. Contract length should be taken from the offer in front of you, not from a supposed market standard." } }, { "@type": "Question", "name": "Which commercial roofs are worth surveying for solar?", "acceptedAnswer": { "@type": "Answer", "text": "Site control often decides an on-site project before irradiance does. Owner-occupier warehouses and factories with a clear roof and a daytime process load are the usual fit, while a short lease, missing landlord consent, a roof due for replacement or very low daytime load is weaker. Lease length, the remaining roof warranty and who pays if the cover fails under the array matter as much as orientation. Asbestos cement, a failed membrane or a roof already scheduled for replacement can stop the scheme or force the roof works first. 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