PPA Mechanics · Structures

Sleeved & Off-site Solar PPA Explained

In a sleeved PPA the solar farm sits somewhere else entirely and a licensed electricity supplier delivers that generation to your meter as if it were ordinary supply. It is the off-site PPA route for businesses that cannot, or will not, put panels on their own roof.

Sleeved vs on-site: where the power physically comes from

The defining feature of a sleeved PPA — also called an off-site PPA — is geography. With an on-site PPA a generator bolts panels to your own roof or land and you consume most of what is produced behind your meter. With an off-site PPA the generating asset is a solar farm that may be fifty or two hundred miles away, connected to the distribution or transmission network rather than to your building. None of those electrons reach you directly; what reaches you is a contractual and settlement arrangement that looks like the farm is powering your site.

That single difference cascades into everything else. Because the generation never enters your private wire, it is subject to the same network use-of-system charges, levies and supplier overheads as grid power. That is why the sleeved tariff band of 11–20 p/kWh in year one sits above the cheapest on-site and behind-the-meter bands — you are buying delivered power, not power that has dodged the grid. In exchange you gain something on-site can never offer: the ability to source renewable electricity for a building you do not own, a roof you cannot use, or a whole estate of meters from a single contract.

How sleeving actually works: the supplier in the middle

A sleeved PPA is a three-party arrangement. The generator owns the solar farm and wants a long, bankable contract for its output. You, the off-taker, want cheaper, greener power at your meter. Neither of you holds an electricity supply licence, so you cannot legally settle import at a meter point between yourselves. The licensed supplier bridges that gap — this is the 'sleeve'.

Mechanically, the supplier takes title to the solar farm's half-hourly output, registers it within its own balancing portfolio, and then bills you for your consumption with the sleeved volume credited against it at the PPA price. Where the farm generates more than you use in a given half-hour, the surplus is sold into the supplier's book; where it generates less, the supplier tops you up from the wholesale market. The supplier charges a sleeving fee (sometimes called a balancing or service fee) for carrying this risk and administration, which is why every sleeved tariff is quoted 'excluding supplier markup'.

1. Generation — the solar farm exports to the grid and meters its output half-hourly.
2. Title transfer — the supplier buys that output under a back-to-back arrangement with the generator.
3. Sleeving — the supplier matches the generation against your consumption across your MPAN(s).
4. Shaping & top-up — the supplier covers the shortfall when the sun is not shining and absorbs surplus when it over-generates.
5. Single bill — you receive one invoice showing sleeved kWh at the PPA rate plus residual grid volume at your supply rate.

Balancing, shaping and the imbalance problem

Solar generation is intermittent and your demand is not. A factory runs its presses at 7am in December when a solar farm is producing almost nothing; the same farm peaks at noon in June when half your workforce is at lunch. Reconciling those two profiles, half-hour by half-hour, is the supplier's core job and the reason sleeving is not free.

The contract will define how this mismatch is priced, and the wording matters enormously. In a firm (or 'shaped') sleeve the supplier guarantees to deliver an agreed volume profile and absorbs the cost of covering gaps — you pay a higher, more predictable rate. In a non-firm (or 'as-generated') sleeve you take the raw solar shape and the supplier passes imbalance charges through to you when the farm deviates from its forecast. Imbalance can swing violently: a cloudy afternoon the forecast did not predict can leave the supplier short in a tight balancing market, and in a pass-through structure that cost lands on your bill.

The clause to read twice. Whether imbalance risk sits with you or the supplier is the single largest variable in a sleeved PPA's real cost. A tariff that looks cheap on a non-firm basis can cost more than grid power in a volatile year. Always ask a prospective supplier to model your worst-case imbalance exposure, not just the headline p/kWh.

This is why the PPA rates page stresses that a sleeved p/kWh is only half the picture: the sleeving fee and the imbalance treatment together determine what you actually pay.

Why off-site suits multi-site tenants and roofless estates

An on-site PPA needs three things you may not have: a roof or parcel of land you control, planning headroom, and a tenure long enough to outlast a 15-to-25-year contract. Plenty of substantial energy buyers have none of them. A retail chain leases its stores. A professional-services firm occupies three floors of a building it will never own. A university runs a split estate of listed halls and modern science blocks where only a fraction of roofs are viable. For all of these, an off-site sleeved PPA is often the only way to put a meaningful renewable volume behind the meter.

• Retail chains — dozens or hundreds of leased units, no single roof big enough, but a large aggregated load a solar farm can serve through one contract.
• Multi-site office tenants — leaseholders without roof rights who still carry a board-level net-zero commitment.
• Distribution networks — logistics operators whose roofs are leased or structurally unsuitable but whose half-hourly demand is large and steady.
• Universities with split estates — where conservation constraints rule out rooftop PV on much of the campus.

The flip side is administrative weight. A sleeved PPA carries supplier negotiation, balancing arrangements and REGO accounting that only make sense above a certain scale. As a rule of thumb the structure is hard to justify below roughly £100k of annual electricity spend, and small half-hourly sites under 100 kVA rarely clear the overhead. Below that threshold an on-site PPA or a simple green tariff is usually the better fit.

REGO certificates, additionality and what you can claim

The reason most off-takers sign a sleeved PPA rather than a standard renewable tariff is the claim — the ability to tell customers, investors and auditors that a specific, identifiable solar asset is powering the business. That claim rests on two things: the contractual sleeve and the REGO certificates (Renewable Energy Guarantees of Origin) that Ofgem issues for each MWh the farm generates.

In a well-drafted sleeved PPA the REGOs from the contracted farm are transferred to you and retired against your consumption, underpinning a market-based Scope 2 claim. Read the contract carefully: REGO ownership is negotiable and some suppliers retain or re-sell them, which would leave you paying a green premium without the right to the green claim. Equally important is additionality — whether your contract genuinely brought new solar capacity onto the grid. A long-term sleeved PPA that helped finance a newly built farm is a far stronger sustainability story than one that simply re-papers an existing asset's output, and increasingly that distinction is what corporate buyers and reporting frameworks scrutinise.

What you want	What to check in the contract
A defensible renewable claim	REGOs from the named farm transfer to you and are retired, not retained by the supplier
An additionality story	The PPA underwrites a new or recently commissioned asset, not just existing output
Audit-ready reporting	Half-hourly generation data and REGO retirement evidence supplied annually

Tariffs, term and the risks worth pricing in

Sleeved PPAs in the UK typically run 10–15 years — shorter than the 15-to-25-year on-site norm, because the generating asset is financed independently of your contract and the supplier prefers a tenor it can hedge. Year-one tariffs sit in the 11–20 p/kWh band before the supplier's sleeving fee, usually with an RPI- or CPI-linked escalator so the rate tracks inflation over the term. Against grid import of roughly 28–32 p/kWh for most commercial off-takers, that is still a material saving — just a smaller one than the cheapest on-site or behind-the-meter routes deliver.

Three risks deserve explicit attention before you sign:

• Supplier credit and balancing risk — the sleeve depends on the licensed supplier staying solvent and managing its book; a supplier failure mid-term forces you to re-paper the arrangement.
• Generator-failure cascade — if the solar farm under-performs or goes offline, your sleeved volume falls and your top-up from the market rises, exposing you to wholesale prices.
• Imbalance charges — in non-firm structures, forecast deviations are passed through and can erode the headline saving in a volatile year.

None of these is a reason to avoid sleeving; they are reasons to read the contract as a risk-allocation document rather than a price list. The single most valuable thing an independent adviser does on an off-site PPA is map which party carries each of these risks and what that does to your true delivered cost.

Who sleeves power, and how to go to market

The suppliers that run sleeving desks are largely the utility and energy-supplier corporate-PPA teams — the licensed players with the trading books and balancing capability to shape generation across a portfolio of meters. They sit alongside the specialist rooftop funds that dominate on-site PPAs and the utility-scale developers behind headline corporate deals; each occupies a different part of the market. Choosing the right counterparty for an off-site structure is a different exercise from choosing a rooftop funder, because you are buying a balancing service as much as a power price.

Because the sleeved market is supplier-led and the imbalance and REGO terms vary widely between desks, going to market without a clear specification is how off-takers end up comparing tariffs that are not really comparable. The cleaner approach is to define your load profile, your tenure and your claim requirements first, then run a structured request to a shortlist of suitable desks. Our PPA providers guide sets out the typology of who does what — rooftop funds, supplier sleeving desks, utility-scale developers and infrastructure-fund SPVs — so you approach the right kind of counterparty for a sleeved deal rather than the wrong one.

If you are weighing an off-site sleeve against putting generation on your own roof, the trade-off is set out in full on the on-site PPA page and across the wider PPA structures explainer. As an independent advisory and matching service we do not sell power or sleeve it ourselves — we explain the mechanics, set realistic tariff expectations and introduce you to vetted suppliers for a disclosed referral fee. To get a sleeved or off-site PPA scoped against your actual meters, request an indicative comparison or contact the team.

FAQs

Frequently asked questions

What is the difference between a sleeved PPA and an off-site PPA?

They describe the same thing from different angles. 'Off-site' refers to the fact that generation happens at a remote solar farm rather than on your roof; 'sleeved' refers to the mechanism — a licensed supplier sleeves that off-site output through its books to your meter. Every sleeved PPA is an off-site PPA, and in UK commercial practice the terms are used interchangeably.

How much does a sleeved PPA cost per kWh?

UK sleeved PPAs typically price at 11–20 p/kWh in year one, before the supplier's sleeving or balancing fee, with an RPI- or CPI-linked escalator over a 10–15 year term. That sits above on-site PPA rates because the power is delivered over the grid and carries network charges, but it is still well below typical commercial grid import of 28–32 p/kWh. See the PPA rates page for how the bands are built.

Who carries the imbalance risk in a sleeved PPA?

It depends on whether the sleeve is firm or non-firm. In a firm (shaped) sleeve the supplier guarantees a volume profile and absorbs imbalance cost for a higher, steadier price. In a non-firm (as-generated) sleeve, forecast deviations are passed through to you. This is the most important commercial term in the contract and should be modelled to a worst case before signing.

Do I get REGO certificates with a sleeved PPA?

You can, but only if the contract says so. A well-drafted sleeved PPA transfers the REGOs from the named solar farm to you and retires them against your consumption, underpinning a market-based Scope 2 renewable claim. Some suppliers retain or re-sell the REGOs, so confirm ownership and retirement explicitly rather than assuming the green claim comes bundled.

Can a tenant without roof rights use a sleeved PPA?

Yes — that is one of its main advantages over an on-site PPA. Because the generation sits on a remote farm and reaches you via your supplier, you do not need to own or control a roof. Multi-site tenants, leaseholders and businesses on roofless or shaded sites use off-site sleeved PPAs precisely because on-site is not available to them.

Is a sleeved PPA worth it for a smaller business?

Usually not below roughly £100k of annual electricity spend. The supplier negotiation, balancing arrangements and REGO accounting carry fixed administrative overhead that only makes sense at scale, and half-hourly sites under 100 kVA rarely clear it. Smaller off-takers are typically better served by an on-site PPA, where viable, or a straightforward renewable supply tariff.

Related on this site

• On-site PPA explained — The roof-mounted alternative — cheaper per kWh, single-site only
• All PPA structures compared — On-site, sleeved, virtual, corporate and metered variants
• PPA rates & tariffs 2026 — How sleeved p/kWh bands and sleeving fees are built
• PPA providers & supplier desks — Who sleeves power and how to approach the right desk
• On-site vs sleeved PPA — Side-by-side trade-offs for choosing a structure
• Get a sleeved PPA comparison — Scope an off-site PPA against your actual meters