Electricity Connections for New Residential Developments
New residential developments face a particular problem: every stand needs power, no infrastructure exists, and individually the cost is prohibitive for most buyers. Connected as a group, the same infrastructure becomes affordable.
This guide covers how group connections work for developments, cooperatives and stand associations.
Why developments are the ideal case for sharing
Group connections work best where several parties need power in the same area at roughly the same time. A new development is precisely that: contiguous stands, a common access route, and buyers who all need supply.
The cost structure follows. A line extension serving the development costs essentially the same whether it feeds five stands or fifty. Transformers can be sized for the combined load with proper diversity, which is far more efficient than individual connections — four households never peak simultaneously, so the combined requirement is well below four times a single household’s peak.
The result is that per-stand cost falls sharply as the group grows. The detail is in sharing a transformer and line extension costs.
Who organises it
This is the practical question that determines whether a development gets power.
The developer, where the infrastructure is part of what is being sold. Cleanest arrangement, and buyers should establish at purchase whether electrical infrastructure is included — many discover afterwards that it is not.
A housing cooperative or stand association, where a structure for collective decisions already exists. This works well because the mechanism for agreeing and collecting contributions is already in place.
A group of individual owners, self-organised. Entirely workable, but someone must take responsibility for coordination, and the arrangement must be documented — see how to split costs fairly.
How the design works
Sizing for a development is not simply the sum of the stands. Each stand’s load is assessed, then combined with a diversity factor reflecting that households do not all peak together.
Transformers are selected from standard ratings — 25kVA, 50kVA, 100kVA, 200kVA and 315kVA — and larger developments may require several units positioned to keep service runs short. That last point matters technically as well as financially: long low-voltage runs cause voltage drop, which should generally be held within about 5 percent of nominal, and beyond that lights dim and motors struggle.
Designing for the development as a whole, rather than stand by stand, is what produces both the cost saving and a supply that actually performs.
Planning for growth
Developments fill over time. A scheme with fifty stands may have eight built in year one.
This creates a genuine tension. Sizing only for current demand means reinforcement later; sizing for full occupancy means today’s owners fund capacity nobody uses for years — and, as covered in who owns the transformer you paid for, spare capacity may be taken up by parties who did not contribute.
The usual answer is to size the transformer for realistic near-term demand while designing the surrounding infrastructure so additional capacity can be added without rebuilding. Getting this balance right is one of the more valuable pieces of work on a development.
What buyers should check before purchasing a stand
This deserves stating plainly, because it catches people out constantly.
Ask whether electrical infrastructure is included in the purchase price, or whether connection is the buyer’s responsibility. Ask how far the nearest 11kV line is. Ask whether any group connection is already organised, and whether contributions have been collected. Ask what has actually been built versus planned.
A stand marketed as serviced is not always electrically serviced. The difference can be a substantial sum, and it is far better established before purchase than after — see what a connection actually costs.
Getting a development connected
The sequence that works: establish the total load with proper diversity; survey the route and identify wayleaves early (see why); design the reticulation and transformer positions; agree the cost split and document it; lodge a single application; then construct, meter and energise, with each stand metered individually.
Individual metering is worth emphasising to buyers: shared infrastructure does not mean a shared bill.
Talk to us about your development — whether you are a developer, a cooperative committee, or a group of owners trying to organise something that has stalled.
Rural schemes are administered by the Rural Electrification Agency.
MyZesaConnect is an independent electrical consultancy. We are not ZESA, ZETDC or ZERA.
Common problems on development connections
Not everyone can pay at the same time. The most frequent obstacle. Some owners are ready, others are not, and the project stalls waiting for the group to align. The usual solutions are proceeding with those who can pay while agreeing terms for later joiners, or phasing the work.
Nobody owns the coordination. Group projects need one accountable person. Where responsibility is shared informally, follow-up stops happening and the file goes quiet.
The developer has moved on. Where infrastructure was assumed to be the developer’s responsibility but was never built, owners must organise it themselves. This is why establishing the position before purchase matters so much.
Stands sell during the project. A new owner inherits a stand but not necessarily a contribution agreement. This should be addressed in the agreement itself, specifying that obligations pass with the stand.
Reticulation: the part that is easy to underestimate
Getting an 11kV line to a development is only half the work. Distributing supply to individual stands requires low-voltage reticulation — poles, conductor and service connections throughout the site.
This is a substantial part of the cost and is sometimes omitted from early estimates, producing an unpleasant surprise later. When comparing figures, always establish whether reticulation to each stand is included or whether the quotation stops at the transformer.
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