Electrification and the LV to HV Tipping Point on Commercial Developments

Providing electric connections exclusively to commercial and industrial developments gives a clear view of the shift that is currently taking place as electrification accelerates.

Gas is rapidly disappearing from development strategy. It is now rare to see a scheme without heat pumps, EV charging infrastructure and increased electrical plant. Individually, these additions are manageable. Combined, they are pushing many commercial developments towards a new threshold — the tipping point between Low Voltage (LV) and High Voltage (HV) supply.

Understanding where that threshold sits is becoming increasingly important.

LV – Historically the Default for Smaller Commercial Schemes

For many smaller commercial developments, LV was traditionally the obvious choice.

In simple terms:

• Joint onto a passing main
• Install a new cable (often relatively short)
• Terminate onsite

Planning implications were limited. No onsite substation was required. Costs were comparatively lower and delivery was relatively straightforward.

For years, this approach worked well.

But baseline electrical demand has changed.

HV – A Different Proposition

Once electrical demand exceeds certain thresholds, an HV connection becomes necessary.

HV brings different considerations:

• Onsite substation requirements
• Planning implications and space allocation
• Legal agreements and land rights (if adopted by the DNO/IDNO)
• Longer lead times due to switchgear procurement
• Higher upfront infrastructure costs

HV is not inherently problematic. In fact, it offers clear advantages:

• Reduced cable run lengths on larger sites
• Greater long-term capacity
• Improved flexibility for future expansion
• Increased export potential where generation is involved

However, the shift from LV to HV is not simply a technical upgrade — it is a strategic change that affects layout, programme and budget.

Electrification Is Not the Only Driver

Electrification is accelerating demand, but it is not the only factor influencing whether a scheme tips into HV.

Many commercial and industrial developments include complex plant and equipment such as:

• Large heat pump compressors
• Lift motors
• Extraction systems
• Refrigeration plant
• Process machinery

In these cases, the headline kVA figure does not tell the full story.

Understanding:

• Starting currents and starting methods
• Load profiles throughout the day
• Diversity assumptions
• Potential disturbing loads

…is just as important as total connected load.

Without careful analysis, a scheme can unintentionally drift beyond LV limits.

Why This Matters at Planning Stage

At early concept stage, many of the elements that ultimately determine connection voltage are not yet fully defined.

However, once detailed load assessments are undertaken, key project assumptions can shift. The required connection voltage can influence:

• Substation positioning and site layout
• Cable routing strategy
• Legal and access requirements
• Delivery programme
• Overall project viability

What initially appeared to be a straightforward LV scheme can evolve into an HV requirement — often later than is ideal.

The result is not usually a “utility problem” but rather an early assumption that no longer holds true.

The New Baseline for Commercial Load

The baseline electrical demand of commercial developments is higher and less diverse than it was even a few years ago.

It is no longer sufficient to estimate what a development “might” require. Effective delivery now demands:

• Detailed load evaluation
• Careful assessment of motor and plant behaviour
• Forward planning for future expansion
• Consideration of electrification impacts from the outset

This is typically addressed during the early stages of a project, where demand modelling and network engagement take place before assumptions become costly.

The LV to HV conversation is no longer just a technical decision. Increasingly, it is a strategic one — and one that is best considered early in the lifecycle of a commercial development.

If you are assessing power requirements for a commercial or industrial scheme and want clarity on where that tipping point may sit, early analysis within a structured new electric connection strategy can prevent significant redesign and delay further down the line.