Hertfordshire vs South West Solar: A Regional Comparison

The South West of England — Bristol, Bath, Somerset, Devon, Cornwall — is one of the strongest solar regions in the UK. Hertfordshire, while solidly above the national average, doesn't quite match the South West on yield. Here's how the two regions compare in 2026.

Yield Comparison

Region

Annual Yield (kWh/kWp)

Hertfordshire	1,050-1,100
Bristol/Bath	1,100-1,150
Cornwall	1,200-1,250

Cornwall is the strongest UK solar region by yield. Bristol sits between Hertfordshire and Cornwall. Across the wider South West, expect roughly 5-15% better generation than equivalent Hertfordshire systems.

For a Bristol-specific perspective on the South West market, D&R Energy's analysis of South West solar in 2026 covers the regional dynamics in detail.

Cost Comparison

System

Hertfordshire

Bristol

4kW residential	£6,800-£8,200	£6,400-£7,800
5kW + 10kWh battery	£14,000-£16,500	£13,000-£15,500
6kW + 13.5kWh battery	£16,500-£19,500	£15,500-£18,500

Bristol pricing typically runs 4-7% below Hertfordshire on equivalent specifications. The wider South West (rural Devon, Cornwall) runs another 3-5% lower again.

Combined Effect on Payback

When you combine yield advantage and cost advantage, South West payback periods consistently come in 0.5-1.5 years shorter than Hertfordshire equivalents:

Hertfordshire 5kW system: ~7.4 years payback
Bristol 5kW system: ~6.8 years payback
Cornwall 5kW system: ~6.2 years payback

Why Hertfordshire Still Makes Sense

Despite the South West yield advantage, Hertfordshire solar remains a strong investment. Three reasons:

1. Higher local electricity rates — South East import rates often 1-2p/kWh above national average

2. Strong house prices — solar adds proportionally more to high-value properties

3. Local grid stability — UK Power Networks delivers fast DNO turnaround

Practical Takeaway

For Hertfordshire homeowners, regional benchmarking helps you understand that while South West yields are better, your local economics are still strong. Don't be discouraged by friends in Cornwall reporting faster payback — your numbers are still good. Get in touch for a Hertfordshire-specific quote.