UK Solar O&M Market 2026: The Maintenance Boom
The shift
More than 1.5 million UK solar systems are now installed — and the oldest are deep into their second decade. The industry that spent fifteen years selling panels is discovering the recurring revenue is in keeping them working.
The cohort that built the industry is ageing
The modern UK solar industry was effectively created in April 2010, when the Feed-in Tariff began paying for every kilowatt-hour generated. The response was explosive — hundreds of thousands of rooftops a year at the peak — before tariff cuts in 2012 and 2016 and the scheme's closure to new applicants in 2019. Ofgem still administers payments to the legacy generators, and will for years yet: FiT terms run 20 to 25 years.
The consequence, in 2026, is an installed base of more than 1.5 million systems whose largest single cohort was bolted down between 2010 and 2015. The oldest are sixteen years old — and the industry that raced to install them is now learning what every other infrastructure sector already knew: the durable business is the one that keeps things working.
The inverter cliff
Solar panels age slowly and predictably. Inverters do not. A typical string inverter gives ten to twelve years of service before failing — usually terminally — which puts the 2010–2013 cohorts squarely into replacement territory now. For a FiT-era generator the maths is unforgiving: a dead inverter stops both the electricity savings and the index-linked subsidy income, so a £1,000–£2,000 replacement decision tends to be made quickly once the owner notices. The catch is the noticing — unmonitored systems can sit dark for months, and routinely do.
Orphans and consolidators
The other inheritance from the boom years is the orphaned system. Installer insolvencies followed each tariff cut, and a substantial share of FiT-era arrays no longer have a live warranty or maintenance relationship. That gap is where the 2026 market is being built, at two scales. Nationally, dedicated O&M specialists have consolidated the workload — Solar Maintenance Solutions services more than 11,000 installations across the country, a book built substantially on adopting systems whose original installers have gone. Regionally, the work flows to established electrical contractors who have added solar to their core trade, such as ALPS Electrical and Solent Solar.
For new installations, the growth is on the commercial installation side; for owners weighing a repair against a replacement, it helps to know what solar actually costs over 25 years, maintenance included.
Frequently asked questions
How big is the UK solar maintenance market?
With more than 1.5 million systems installed — the oldest now 16 years old — operations and maintenance (O&M) is the fastest-growing recurring-revenue opportunity in UK solar, driven by ageing inverters and orphaned Feed-in Tariff-era arrays.
How often do solar inverters need replacing?
A typical string inverter lasts 10–12 years before failing, usually terminally. That puts the 2010–2013 installation cohorts squarely into replacement territory now, with the earliest systems approaching their second inverter swap.
What is an orphaned solar system?
An orphaned system is one whose original installer has gone out of business, leaving it with no live warranty or maintenance relationship. Installer insolvencies followed each FiT tariff cut, so a substantial share of FiT-era arrays are now orphaned — the core of the 2026 O&M market.