Imagine receiving a staggering £200,000 heating bill out of the blue – that’s exactly what happened to residents of a London flat complex, leaving them reeling and fighting back. But here’s where it gets controversial: could this be a warning sign of deeper issues in the UK’s growing heat network system?
Anja Georgiou, a mother living in the River Gardens development in Greenwich, southeast London, feels trapped. ‘If I could move, I would – to a place without a heat network,’ she says. ‘But I can’t, not with this debt hanging over me.’ Her frustration echoes that of her neighbors, who were blindsided by the massive bill for heating and hot water three years ago. With its stunning views of the Thames and proximity to historic Greenwich Park, River Gardens is undeniably a desirable place to live. The development boasts amenities like a gym and swimming pool, and like many modern London builds, it relies on a communal boiler system—a common form of heat network.
Heat networks, also known as district heating systems, supply warmth from a central source via a network of pipes carrying hot water. Typically, the landlord or freeholder acts as the supplier, purchasing energy on the commercial market for residents. Despite their increasing popularity—nearly three-quarters of new London homes have adopted them in recent years—the industry operated without regulation until January 27, 2024, when Ofgem stepped in to oversee the sector. This move aims to protect customers from unfair price hikes, a relief for the 500,000 to 1 million households connected to such systems.
And this is the part most people miss: the lack of regulation left residents like Georgiou vulnerable to sudden, exorbitant charges. In spring 2023, River Gardens residents were informed their energy tariff would increase that summer, jumping from 20p per kilowatt-hour with a 55p standing charge to 37p and 39p, respectively. But that wasn’t the worst of it. The development’s managing agent, Rendall & Rittner (R&R), revealed an additional charge due to a £198,986 debt accumulated on the heat network’s energy account over 15 months in 2022 and 2023.
Calum Matheson, Georgiou’s neighbor and a software developer, was told he owed an extra £550. ‘It was plainly wrong,’ he says. ‘I’d already paid my bills. You can’t just send me another one.’ Residents who were up to date with payments were baffled. In a follow-up letter, R&R attempted to explain: the energy supplier, With Energy, had stopped buying gas for the building in 2022, forcing R&R’s procurement arm to take over. However, while gas prices nearly doubled, R&R failed to adjust residents’ tariffs quickly enough, creating a deficit between the cost of gas and the bills paid.
The debt was then divided among homeowners and tenants based on usage, with bills ranging from £50 to £600. Georgiou’s share? £337. R&R warned that residents couldn’t switch to a cheaper winter 2023 deal until the debt was cleared. ‘Our energy contracts had clear terms,’ Georgiou argues. ‘They can’t just demand higher tariffs for bills already paid. It’s outrageous.’
Matheson fought back, representing himself and 56 other leaseholders at a first-tier property tribunal. Last month, their efforts paid off: the tribunal ruled the debt ‘irrecoverable as service charges’ and disallowed 20% of R&R’s fees for the period in question. Yet, despite the victory, many residents had already paid their portion of the bill in 2024, fearing legal action. The tribunal lacks the power to order refunds, and the debt remains on Georgiou’s account.
Here’s the real question: could this happen to you? Heat networks are a cornerstone of the UK’s net-zero strategy, with the government aiming for them to supply 20% of England’s heat by 2050, up from 3% today. But as Stephen Knight of Heat Trust points out, ‘We see this quite a lot.’ The new Ofgem rules require tariffs to be announced 31 days in advance, effectively banning retroactive price increases. However, critics argue that proper price protection—akin to the energy price cap—is still missing.
Ofgem’s Helena Charlton acknowledges the issue: ‘Too many people face unclear bills, poor communication, or uncertainty when things go wrong.’ While new protections, including ombudsman services, took effect in 2025, Knight believes regulation is ‘long overdue.’ ‘There’s a huge range of detriment issues due to this sector not being properly regulated,’ he warns.
So, what’s next? Matheson hopes R&R will rectify the situation, but he’s also fighting on principle: ‘I want my £550 back.’ Meanwhile, Georgiou and her neighbors remain in limbo, their story a cautionary tale for the millions relying on heat networks. Is this the future of energy in the UK, or a system in desperate need of reform? Let us know your thoughts in the comments.
