Cost by size

Solar PPA cost & tariff by system size — UK 2026

Eight size bands from 50kWp small commercial to 10MWp+ utility-scale. Each page covers indicative capex (cash purchase reference), PPA year-1 tariff, expected annual generation and audience.

System size	Capex (cash)	PPA tariff (year 1)	Annual generation
50kWp PPA	£42,000–£55,000	16–20 p/kWh	47,500 kWh
100kWp PPA	£82,000–£105,000	14–18 p/kWh	95,000 kWh
250kWp PPA	£200,000–£260,000	12–16 p/kWh	237,500 kWh
500kWp PPA	£395,000–£500,000	11–14 p/kWh	475,000 kWh
1MWp PPA	£750,000–£950,000	10–13 p/kWh	950,000 kWh
2MWp PPA	£1.45m–£1.85m	9–12 p/kWh	1,900,000 kWh
5MWp PPA (ground-mount or large rooftop)	£3.5m–£4.5m	8–11 p/kWh	4,750,000 kWh
10MWp+ PPA (utility-scale)	£6.5m+	£42–£55/MWh fixed (4.2–5.5 p/kWh)	9,500,000 kWh

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