Energy Becomes a Building Function

Grid connection has become one of the slowest parts of any project. Network operators in Australia, Britain and the United States have all faced long queues for new connections and upgrades, and the equipment that sits between the grid and a building, transformers and high-voltage switchgear, has had long lead times. A building that already holds a generous supply has something a newer competitor may wait years for.

This is why we think of electrical capacity the way the market has always thought of location. It is partly fixed, hard to add, and it determines what a site can be used for. The argument runs through When the Shed Becomes a Power Station for industrial stock, but it applies to offices, retail and mixed-use buildings too.

Inside the building, the main switchboard is where this becomes physical. An older board may be at the end of its life, short of spare capacity, or built to standards that make modification difficult. Replacing it can mean a shutdown, temporary supply and coordination with the network. It is rarely a large line in isolation, but it often gates everything else: electrified heating, chargers, solar and batteries all need somewhere to connect.

In many ageing buildings the switchboard is the quiet bottleneck. Nothing on the electrification wish-list can happen until it does.

Increasing a building’s electrical supply is rarely a matter of asking. It usually involves an application to the network operator, a study of local network capacity, and sometimes a new or upgraded substation, either on site or in the street. The equipment involved, transformers and high-voltage switchgear, has had long lead times since 2022. In the United States, federal laboratory research documented waits of up to two years for distribution transformers at the 2024 peak; those have since eased, but large power transformers still commonly take more than two years. Australian and British owners report similar delays for substation equipment and network works.

The consequence is that supply capacity behaves like a scarce asset. An owner who already holds it can offer electrified heating, fleet charging or process loads quickly. One who does not may wait years, at a cost that is partly outside their control. That asymmetry is now showing in leasing conversations for industrial and logistics space, and it is starting to appear in office and mixed-use buildings planning to electrify.

The difficulty of adding supply is not only the network’s capacity. It is the equipment needed to connect to it. Lead times for electrical plant lengthened sharply from 2021 and have only partly eased.

Prices moved with the queues: power transformer prices were reported to have risen about 77 per cent since 2019. For a building, the practical point is that a supply upgrade needing a new transformer is a multi-year programme item, and it should enter the capital plan years before the load it serves.

Britain’s transmission connection queue had grown beyond 700 gigawatts, far more than the system could ever connect. Reform approved by Ofgem in 2025 reordered it around readiness and strategic need. The results published in December 2025 left 283 gigawatts of generation and storage and 99 gigawatts of demand in the new pipeline. Only about 13 gigawatts of new transmission demand can connect before 2030, with a further 86 gigawatts from 2030 to 2035.

At distribution level, UK Power Networks reported that 59 per cent of its customers secured a place in the reformed queue and that the queue more than halved. Reform reallocates capacity rather than creating it. For a building or a site that needs a larger connection, the queue position is now a property attribute in its own right.

In a register, the energy chain reads in order: incoming supply and its agreement; main switchboard, age, capacity and spare ways; sub-mains and distribution; heating and hot water plant and its fuel; roof capacity for generation; space and fire strategy for storage; and metering and controls. Each link has its own condition and timing. The useful judgement is about the weakest link, because that is the one that sets the pace for the rest.

The other side of the shift is gas. Gas boilers and gas services were once the cheap, reliable default. In many jurisdictions they now face carbon limits, disclosure, rising network charges and, for new buildings, outright restriction. A building that relies on gas for heating has a conversion in its future even if the date is uncertain.

That conversion is not a like-for-like swap. Heat pumps run at lower temperatures, may need different distribution, take roof or plant space and add electrical load. The After Rent paper makes the case that electrification is ultimately about control, not compliance. Whatever the motive, the capital consequence is the same: gas-dependent plant has a shortened useful life in the minds of tenants, lenders and buyers, whatever its physical condition.

In a Capital Strategy, energy capacity should be read as a system rather than a set of separate items. The supply, the main board, distribution, heating plant, roof capacity for generation and the space for storage or charging belong to one story. Reading them together tells an owner what the building can become and in what order the works need to happen.

It also changes how to read timing. A switchboard with five years of physical life may still need to move earlier if it blocks a heating conversion that a tenant or a regulation requires. That is a decision, not a condition rating, and it belongs in the conversation with the owner. If connection queues clear and equipment lead times normalise, capacity becomes easier to add and this argument loses some of its force; we will say so when it does.