Who Owns the Watts? Shared Battery Storage and the Service-Charge Question

Walk into a show home on almost any scheme completed in the last couple of years and the energy story will be displayed somewhere prominent: photovoltaic panels on the roof, a cabinet of lithium-ion batteries at ground level, and a phrase such as “energy-resilient” or “self-powered community” printed on the wall. What is far less likely to appear is a diagram showing who owns that equipment, who decides when it charges and discharges, and who receives the money it generates.

The omission is not trivial. A battery is not a boiler. It can earn revenue by providing grid services, it can shift cheap overnight power into the evening peak, and — if wired correctly — it can keep lifts, communal lighting and fire systems running during a supply interruption. The identical installation can therefore be a genuine reduction in the service charge, a retained income stream for a developer, or an uninsured liability behind a locked plant-room door. Which of those you are buying into is decided by documents rather than by marketing.

The kit on the roof is rarely yours

The first question on any viewing is simply: who owns it? In practice, shared generation and storage on new estates tends to follow one of four routes.

The first is common ownership through a residents' management company or estate management company, funded from the service charge and held for the benefit of leaseholders. The second is retention by the developer or a related energy services company, which then sells power to occupiers through a private wire arrangement. The third is a lease of roof space or a wayleave granted to a third-party operator, who installs and runs the equipment commercially. The fourth is freehold ownership by the landlord as an investment, with residents billed for consumption or not billed at all.

Each produces a materially different set of rights. Where an energy services company is involved, occupiers are in effect buying electricity from a private network rather than from a licensed supplier. That can work perfectly well, but it is a supply relationship: it has a tariff, a contract, a billing mechanism and a termination clause, and all four should be read in full before exchange. Private wire networks also sit within a specific regulatory framework, so it is reasonable to ask the developer or managing agent to confirm the basis on which the supply is permitted.

Who decides when the battery works

Ownership and control are separate matters. A block may own the asset while an aggregator or management company holds the right to decide its operating profile. Ask directly what the dispatch priorities are. Does the system protect communal supplies first and seek revenue second, or the reverse? Is the battery configured to provide backup to individual flats, to communal areas only, or to neither?

It is also worth asking whether residents can opt out of any arrangement, what happens if the operator changes, and how consumption data is shared. A system that produces detailed half-hourly data on every household can be a useful tool for a managing agent and an uncomfortable one for an occupier, depending on who can see it and what it is used for.

Reading the service charge before the sales brochure

Battery storage has a working life, a warranty and a degradation curve. All three should appear in the service charge budget rather than arriving as a surprise in year nine.

Ask for the energy and utilities line in the current budget and the projected five-year forecast. Look specifically for three items: a sinking fund contribution towards replacement, an allowance for monitoring or software subscriptions, and the insurance position. Some warranties are contingent on maintaining a monitoring contract, which means an apparently minor line item can become essential to the asset's value. You should also ask what happens if the manufacturer withdraws from the UK market or ceases to support the control software — a scenario that has become familiar enough in the consumer smart-home sector to be a fair question on a commercial installation.

If the battery earns money from grid services or from exporting power, ask where that income goes. A well-drafted arrangement credits it against the service charge. A poorly drafted one leaves it with the operator while residents continue to fund maintenance.

What the lease should say

Leasehold titles on newer estates increasingly include provisions that did not exist a generation ago. Check whether the lease defines the renewable energy equipment, grants the landlord or management company rights of access to it, and imposes a corresponding obligation to maintain and insure it. Where a long-term agreement with an operator is contemplated, the statutory consultation requirements for qualifying long-term agreements apply, and it is worth asking whether any such agreement is already in place and for how long.

Where the roof has been let to a third party, confirm that the lease does not leave you with an obligation to repair something you have no power to control. Where a private wire arrangement exists, ask whether it binds future owners and how it ends.

Eight questions to put in writing

• Who owns the panels, the inverter and the battery, and will that change on handover?
• Who controls charging and discharging, and under what contract?
• What tariff applies to electricity from the shared system, and how is it reviewed?
• Is there a standing charge, a capacity charge or a subscription attached to it?
• What is the replacement cost, and is a sinking fund contribution already being collected?
• Who maintains the equipment, and what happens when the warranty expires?
• Is any income from the asset credited against the service charge?
• What access rights does the operator hold, and for how long?

If you are renting

Tenants rarely see the service charge, but the arrangement still affects them. Ask whether the property is on a private wire supply, whether “bills included” genuinely covers it, and whether the battery reduces the occupier's cost at all or only the communal one. A system that cuts the landlord's bill while leaving the tenant on a standard tariff is a legitimate arrangement, but it should be understood as one.

Shared storage is a sensible technology. The difficulty is that the commercial structures around it have arrived faster than the standard questions buyers know to ask. Treat the basement cabinet the way you would treat a district heating plant or a communal lift: fascinating on the tour, but only worth the money if the paperwork around it holds up.