Category: Decision frameworks

Are Solar PPAs Worth It for UK Businesses?

A decision framework for UK businesses: when a solar PPA beats buying or grants, judged by capital, lease tenure, covenant and load profile.

A solar PPA is worth it when your site has a strong daytime load, you'd rather preserve capital than spend it on a roof, and you expect to occupy the building for most of the contract. Buying outright or chasing a grant tends to win when you have spare cash, a short lease, or a weak in-day load profile.

The honest answer: "it depends" — but on four specific things

"Are solar PPAs worth it?" has no universal answer, because a PPA is a financing route, not a product. The same 400kWp array can be a brilliant decision for one business and a poor one for the business next door. What separates the two isn't the technology — it's four commercial variables: your capital position, your tenure (how long you'll occupy the site), your covenant (how a funder rates your creditworthiness), and your load profile (when you actually use electricity). Score yourself honestly against those four and the answer becomes obvious.

This post gives you that framework. If you'd rather see the numbers side by side, the compare PPA vs buying breakdown runs a full cashflow comparison; here we focus on which route fits your circumstances before you get to spreadsheets.

Variable 1: Capital position

The single biggest reason businesses choose a solar power purchase agreement is that it needs no upfront capital. The provider funds, owns, installs and maintains the system; you simply buy the electricity it generates at an agreed rate. So your capital position is the first filter.

• Cash-rich, low cost of capital: if you can fund a system from reserves and your hurdle rate is low, buying outright usually beats a PPA on lifetime cost. You keep 100% of the savings and the export revenue.
• Capital-constrained or capital better deployed elsewhere: if every pound has a higher-return home in the core business, a PPA lets you take the energy savings without touching the balance sheet. This is the classic case where a PPA is worth it.
• Want the asset but not the cash outlay: consider where the money actually comes from — our explainer on how a PPA is funded shows how the provider's own debt and equity stack replaces your capital, and why that shifts performance risk off you.

Variable 2: Tenure — how long will you be there?

PPAs typically run 10–25 years. The economics assume you stay long enough to bank years of below-grid electricity. Tenure is therefore make-or-break.

Your situation	PPA worth it?	Why
Freehold owner-occupier	Strong yes	You capture the full term and benefit from a transferable asset on sale.
Long lease (15yr+ remaining)	Usually yes	Enough runway to clear early-years value; check assignment terms.
Short lease (under 8yr) with no renewal certainty	Often no	You may exit before the savings compound; a shorter-term route may fit better.
Planning to sell within 5 years	Depends on buyer	A well-structured PPA can transfer, but it must not deter purchasers.

If you don't own the freehold, two contract clauses decide whether a PPA survives a move or a sale: assignment and step-in rights. Raise both with any provider early — a good UK solar PPA provider will have a clean, lender-friendly answer rather than a problem to be discovered later.

Variable 3: Covenant — how a funder rates you

Because the provider is lending against your future electricity purchases, your covenant strength directly affects whether you get offered a PPA at all — and at what rate.

• Strong covenant (investment-grade, listed, long trading history): you'll attract the most providers and the keenest tariffs. A PPA is very likely to be worth it because you're effectively borrowing cheaply against your own credit.
• Mid covenant (profitable SME, a few years' accounts): still very fundable; expect a slightly higher tariff and possibly a shorter term or a parent guarantee.
• Weak or thin covenant (early-stage, loss-making, single-site startup): PPA offers may be limited or priced high. Self-financing a smaller system, or a grant-backed route, can work out better.

Don't guess where you sit. The current 2026 solar PPA rates are quoted as ranges precisely because covenant, size and load move the number — and the difference between the top and bottom of the range is where "worth it" is won or lost.

Variable 4: Load profile — when do you use power?

Solar generates in the daytime. A PPA only saves you money on the kWh you self-consume on site; everything you export earns far less. So your load shape matters more than your roof size.

• High daytime, weekday-heavy load (manufacturing, cold storage, data-adjacent, daytime offices): excellent fit — you'll self-consume most of the generation and feel the saving immediately.
• Round-the-clock load (care homes, hospitals, 24/7 logistics): strong fit; solar shaves the daytime peak even if night demand stays on grid.
• Evening or seasonal load (hospitality, some retail): weaker — more of your generation gets exported, so the per-kWh advantage shrinks unless you add battery storage.

If a large share of your output would be exported rather than used, the export value matters, and you should weigh SEG vs PPA export before committing. For a worked sector example, our solar PPA for factories page shows how a heavy weekday load makes the case almost regardless of capital position.

When buying outright wins instead

A PPA is not always the answer. Buying tends to beat it when:

• You have cash sitting idle at a low return and a long-term horizon on the site.
• You want every penny of the savings, the export income and any capital allowances for yourself.
• Your finance team would rather own a depreciating asset than carry a long-term purchase commitment.
• The system is small enough that the cost of structuring and legals on a PPA outweighs the benefit.

When a grant route wins instead

Grants change the maths because they cut the capital cost of buying — which only helps if you were going to buy. Public-sector and some farm or rural schemes can fund a meaningful slice of a system, at which point self-financing the remainder may beat a PPA on lifetime cost. The trade-off is administration, eligibility windows and timelines. A PPA, by contrast, needs no grant and no capital — you trade a share of the savings for certainty and speed. If you're weighing the two, look at the lifetime cost net of grant against the PPA tariff over the same term, not just the headline upfront figure.

A 60-second self-test

Tally a "PPA point" for each statement that's true of your business:

1. I'd rather not spend capital on a roof system right now.
2. I'll occupy this site for at least 10 more years (or own the freehold).
3. We're profitable with a reasonable trading history.
4. We use most of our electricity in daylight hours, on weekdays.
5. I want predictable energy costs and someone else to own the maintenance and performance risk.

Four or five points: a PPA is very likely worth it — get an indicative tariff and pressure-test it. Two or three: it's a genuine toss-up; model it properly against buying. Zero or one: buying outright or a grant-backed purchase will probably serve you better.

The bottom line

Solar PPAs are "worth it" for a specific and common profile: businesses that use power in the day, plan to stay put, can be funded comfortably, and would rather deploy capital in their trade than on a roof. They're a weaker choice for cash-rich, short-tenure, or evening-load sites — where buying or a grant route usually wins. The framework above tells you which camp you're in within a minute. Once you know, the next step is a real number: tell us about your site and we'll return an indicative tariff range and shortlist the providers most likely to fund you. Start with a no-obligation site assessment.