Solar Panels Scotland: Are They Worth It?

4kW system annual generation by Scottish location:

| Location | Sun Hours/yr | Yield (kWh/kWp) | 4kW Output | vs London | |----------|-------------|----------------|-----------|----------| | Edinburgh | 1,500 | 920 | 3,680 kWh | –8% | | Glasgow | 1,400 | 880 | 3,520 kWh | –12% | | Aberdeen | 1,450 | 900 | 3,600 kWh | –10% | | Dundee | 1,480 | 910 | 3,640 kWh | –9% | | Inverness | 1,350 | 850 | 3,400 kWh | –15% | | Stirling | 1,420 | 890 | 3,560 kWh | –11% | | London | 1,640 | 1,020 | 4,080 kWh | Baseline |

Key insight: The difference is 8–15%, not the 30–50% many people assume. Scotland gets significantly more summer daylight than England (18+ hours in June vs 16 in London), which partially compensates for lower winter output and slightly lower irradiance.

Source: PVGIS UK irradiance data; Met Office sunshine hour records.

Financial comparison (4kW system):

| Metric | Scotland (Glasgow) | England (London) | |--------|-------------------|------------------| | Installation cost | £5,500–£8,000 | £5,500–£8,000 | | Annual generation | 3,520 kWh | 4,080 kWh | | Annual savings | £600 | £700 | | Payback | 11–13 years | 9–11 years | | 25-year net profit | £5,500–£8,000 | £7,500–£10,500 | | ROI | 80–120% | 110–155% |

Scottish payback is 1–2 years longer than southern England. The absolute savings are lower, but the ROI is still strongly positive. Scotland is firmly in 'worth it' territory.

Scottish advantage: Installation costs are identical (national pricing). The only difference is output — which is only 10–15% lower.

Source: MCS installer pricing (national); PVGIS Scottish irradiance.

Scotland has additional support that England and Wales do not:

Home Energy Scotland (HES) Loan: - Interest-free loan up to £7,500 for solar panels - Up to £6,000 for battery storage - Repayable over 10 years - No arrangement fee - Means-tested cashback grant of up to £7,500 also available for some households - Apply through homeenergyscotland.org

UK-wide support (also available in Scotland): - 0% VAT on solar installation (until March 2027) - Smart Export Guarantee (4–15p/kWh for surplus) - BUS grant (£7,500 for heat pump — combine with solar)

The Scottish advantage: The interest-free loan means Scottish homeowners can install solar with zero upfront cost and pay back from electricity savings. Monthly loan payment: ~£56–£67/month. Monthly electricity savings: £46–£58/month. Near cash-flow neutral from day one.

Source: Home Energy Scotland; Scottish Government energy efficiency programme.

Scotland's latitude (55–59°N) means dramatically longer summer days:

Daylight hours comparison (Edinburgh vs London):

| Date | Edinburgh | London | Difference | |------|-----------|--------|------------| | 21 June (summer solstice) | 17h 36min | 16h 38min | +58 min | | 21 March (equinox) | 12h 14min | 12h 10min | +4 min | | 21 December (winter solstice) | 6h 57min | 7h 50min | –53 min |

What this means for solar: - Scottish panels generate for nearly an hour longer per day in summer - This partially compensates for lower irradiance intensity - Summer months (April–September) contribute 75% of annual Scottish solar output - The 'golden hours' of 5–8am and 5–8pm are productive in Scottish summer

But winter is harder: - December daylight in Edinburgh: under 7 hours (vs ~8 hours in London) - Winter output: 70–100 kWh/month (vs 100–130 in London) - A battery is particularly valuable for Scottish winter evenings

Source: TimeandDate.com daylight data; PVGIS seasonal output.

Scotland has its own planning and building regulations:

Planning: - Permitted development rules are similar to England — most residential solar does not need planning permission - Conservation area restrictions apply (panels on highway-facing slopes may need permission) - Listed building consent required for listed properties (Historic Environment Scotland) - National Parks (Cairngorms, Loch Lomond & Trossachs) may have additional restrictions

Building Standards: - Scotland uses Scottish Building Standards (not Part P) - MCS-certified installers in Scotland comply with these standards - The MCS certification process is the same UK-wide

Energy Performance Certificates: - Scotland uses the same EPC system as England and Wales - Solar improves your EPC by 1–2 bands - Minimum EPC E is required for rental properties (same as England)

Source: Scottish Government planning guidance; Scottish Building Standards.