500 kWp commercial solar system — cost, size and payback (UK)
A 500 kWp system is the entry point to large-format commercial solar in the UK — big-box distribution, national retailer roll-outs, tier-1 manufacturers, multi-site hospital estates. Full G99 DNO approval is required, and network reinforcement is a common cost consideration.
500 kWp at a glance
Best fit business types
- Big-box distribution and fulfilment centres
- National retailer roll-out sites
- Tier-1 manufacturers and process plants
- NHS hospital estates and university campuses
- Large agricultural / poultry sites
Design and spec notes
- Central inverter architecture, single-point DNO G99 connection.
- Network reinforcement fee possible — factor £30–£100k contingency.
- PPA and corporate offtake models routinely available at this size.
- Battery storage (500 kWh–1 MWh) opens flexibility market revenue.
Related reading
FAQ — 500 kWp systems
Does 500 kWp trigger extra planning steps?
Rooftop is still Permitted Development in England up to 1 MWp. Ground-mounted 500 kWp needs a planning application.
What's the DNO connection cost?
Standard G99 approval on an already-fed site is £3–£10k. Network reinforcement (needed on ~15% of 500 kWp+ sites) can add £30–£150k.
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