Can Plug-In Solar Save You £1,000+ Over 5 Years?

Q: So… £728, Not £1,000?

With average assumptions, a Midlands household saves £728 over 5 years — not quite £1,000. But the model is conservative. Here's how to reach £1,000+:

We model the 5-year savings from an 800W plug-in solar kit at current UK energy prices. The numbers may surprise you.

The 5-Year Model

Let's model the 5-year savings from an 800W plug-in solar system purchased for £600, installed in a typical English location.

Assumptions

Location: Midlands (representative UK average)
System: 800W, garden mount at 35° south-facing
Annual generation: 850 kWh (PVGIS estimate)
Self-consumption: 60% (mixed presence household)
Tariff: Starting at 24.5p/kWh (Ofgem Q3 2026 cap), rising 3% annually
Panel degradation: 0.5% per year
Export tariff: 4p/kWh (SEG)

Year-by-Year Breakdown

Year	Generation	Self-consumed	Import saved	Export income	Total saved
1	850 kWh	510 kWh	£125	£14	£139
2	846 kWh	507 kWh	£128	£14	£142
3	842 kWh	505 kWh	£132	£13	£145
4	838 kWh	503 kWh	£136	£13	£149
5	834 kWh	500 kWh	£140	£13	£153
Total	4,210	2,525	£661	£67	£728

So… £728, Not £1,000?

With average assumptions, a Midlands household saves £728 over 5 years — not quite £1,000. But the model is conservative. Here's how to reach £1,000+:

Scenario A: Higher Self-Consumption (75%)

If you work from home or use smart automation to shift loads, 75% self-consumption pushes 5-year savings to ~£920.

Scenario B: Southern Location

Moving the model to the South East (950 kWh/year) with 60% self-consumption gives ~£820.

Scenario C: Higher Self-Consumption + Southern

Combining both: South East, 75% self-consumption, 5-year total = ~£1,050+. That's your £1,000.

Scenario D: Time-of-Use Tariff

On Octopus Agile, peak rates can hit 35p+. Displacing peak-rate imports with solar pushes savings to ~£1,100+ even in the Midlands.

The 10-Year Picture

Over 10 years, every scenario comfortably exceeds £1,000:

Scenario	10-year savings	Net profit (after £600 kit)
Conservative	£1,530	£930
High self-consumption	£1,940	£1,340
Southern + high SC	£2,200	£1,600
Agile tariff	£2,400+	£1,800+

What if energy prices drop?

Even if prices fall 20%, plug-in solar still pays back within 6-7 years. The UK's energy cost trend is upward, making solar increasingly valuable over time.

What about inflation?

Energy prices tend to rise faster than general inflation, which actually improves solar economics over time.

Can I calculate my exact savings?

Yes — use our postcode-specific calculator for a personalised estimate.