Updated October 2026
In short: Electricity grid capacity now decides whether many developments can go ahead on time. Electrification (heat pumps, EV charging, all-electric homes) increases the load each scheme needs, and in many areas the local network or the wider transmission system is constrained. Check capacity before you buy a site, not after planning.
How the grid is organised
| Level | Who runs it | Relevance to developers |
|---|---|---|
| Transmission (high voltage) | National Grid Electricity Transmission (England and Wales), with the National Energy System Operator managing the system | Large schemes, data centres and generation; connection queues have been long |
| Distribution (local network) | Distribution Network Operators (DNOs) such as UK Power Networks, SSEN, Northern Powergrid and National Grid Electricity Distribution | Most housing and commercial schemes connect here |
| Independent networks | IDNOs and independent connection providers | Can design and adopt on-site networks, sometimes faster |
What affects your connection
Grid due diligence before buying a site
- Check the DNO's network capacity maps and heat maps for the area
- Request a budget estimate early, before exchanging
- Find out whether a new substation is needed and where it can go
- Confirm whether reinforcement upstream is required, and the timescale
- Factor in heat pumps, EV chargers and any on-site generation or batteries
- Consider phasing so early homes can be connected first
Connection costs and timescales
Costs depend on the load, distance to suitable infrastructure and whether reinforcement is needed. Simple housing connections can be straightforward, but schemes needing a new substation or upstream works can face long lead times. Industry connection reforms are reprioritising the queue towards projects that are ready to proceed, so having planning and land control in place matters.
Ways to de-risk
- Make grid capacity a condition of your land purchase or option
- Use an independent connection provider for contestable works
- Design for lower peak demand: efficient fabric, smart charging, batteries
- Agree substation land and easements in the site layout early
How Fraser Bond helps developers
- Site sourcing with early infrastructure checks
- Conditional contracts that protect you while grid and planning are secured
- Introductions to utility consultants and connection providers
- Development appraisals that include realistic utility costs and timescales
Assessing a development site?
Talk to us about sourcing and appraising sites with infrastructure risk built in.
Speak to our teamRelated guides
Fraser Bond services: Development · Investment · Contact us
