Autonomy scoreLocal analysis
Glasgow Home autonomy potential in Glasgow (Scotland)
The strongest asset here is Rainwater. It is not, however, what pays your home the most: that is Low-carbon heating.
Annual potential, standard home
£4,775
Four items added up — each one is a separate decision, in whatever order suits you.
Overall score
57 /100
Growing
Glasgow: 57/100 achievable autonomy with a recommended setup.
Solid potential — real, achievable gains in energy, water & food autonomy await.
What you could reach in Glasgow
A typical home in Glasgow can reach about 57% self-sufficiency with a right-sized solar, storage, rainwater and low-carbon heating setup — much of it backed by UK grants and 0% VAT. The figure sharpens once you enter your own home.
- ≈196 days a year off the grid — keep the fridge, lights, router and heating pump running straight from your own roof and battery, right through a winter outage.
- Rainwater self-reliance — ≈117,215 L harvested from a 100 m² roof covers the garden and toilet flushing, so hosepipe bans stop mattering.
- A real harvest — ≈230 kg of fresh vegetables over a ≈204-day frost-free season takes a genuine bite out of the weekly shop.
- A warm, low-bill winter — insulation plus a right-sized heat pump turns the local climate into low-carbon comfort and shields you from gas-price spikes.
From the most to the least profitable, here
What you could gain
-
Low-carbon heating25/100
~£3,199/yr
less heating after insulation + heat pump (−11,070 kWh/yr on 90 m², electric heating)
The detail
Realistic outlook
3,520 heating-degree-days: a high-efficiency heat pump is the lowest-carbon way to keep Glasgow warm.
Watch-outs
A heat pump only pays off in a well-insulated envelope — insulate first, then size the unit.
Grants & tips
Boiler Upgrade Scheme: £7,500 towards an air-source heat pump (England & Wales); ECO4 and the Great British Insulation Scheme fund insulation, plus 0% VAT on heat pumps.
Heating-degree-days (base 18°C) : ≈ 3,520 HDD — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (base 18°C).
-
Food growing52/100
~£676/yr
off the weekly shop — up to ≈230 kg/yr of fresh vegetables from 100 m²
The detail
Realistic outlook
With about 204 frost-free days, a household garden in Glasgow supports two planting rotations a year.
Watch-outs
A productive garden needs space, decent soil and a few hours a week — start small and scale up.
Grants & tips
Council allotments (Allotments Act) give cheap growing plots; RHS and community-garden schemes support home food production.
Frost-free growing season : ≈ 204 days — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (frost dates).
-
Solar energy50/100
~£640/yr
less electricity with 3 kWp on your roof (≈2,559 kWh/yr)
The detail
Realistic outlook
At 853 kWh/kWp per year, Glasgow offers solid potential for residential rooftop solar.
Watch-outs
Roof orientation, shading and DNO connection rules affect real output — get an MCS-certified site assessment first.
Grants & tips
Smart Export Guarantee (SEG): your supplier pays for surplus solar exported to the grid, plus 0% VAT on residential solar PV and battery storage until 2027.
Annual PV yield : 853 kWh/kWp — Source: PVGIS 5.2 (EU Joint Research Centre), optimal tilt and local horizon.
-
Rainwater90/100
~£260/yr
less mains water with a 5,000 L tank (≈117,215 L/yr harvestable from a 100 m² roof)
The detail
Realistic outlook
1,379 mm of rain a year makes rooftop rainwater harvesting highly productive in Glasgow.
Watch-outs
Harvested rain is non-potable by default — keep it separate from drinking water and add a first-flush diverter.
Grants & tips
Many UK water companies offer subsidised or free water butts; on a metered supply, harvested rainwater cuts your water bill directly.
Average annual rainfall : 1,379 mm — Source: NASA POWER, MERRA-2 corrected precipitation.
£4,775
Ranked by annual value. The order of the works themselves does not change: insulate before you equip.
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Estimate your solar system in Glasgow
Estimate your solar system in Glasgow
Based on a local yield of 853 kWh/kWp per year.
Indicative estimate (production = kWp × local yield). Real output depends on roof orientation, shading and your self-consumption rate.
Climate month by month in Glasgow
In Glasgow, a 3 kWp array pitched at 40° and facing 2° west of south — the optimum PVGIS computes for this location — produces about 2,559 kWh a year. May is the strongest month, at about 351 kWh, and December the weakest, at 63 kWh. November to February bring only 15% of the year's output, so a battery evens out days rather than seasons: in winter the grid or another source carries most of the load.
Every month averages below 15 °C in Glasgow, so some heating is needed all year round; January is the coldest at 3.4 °C. In a typical year the coldest hours drop to about -3 °C, the point a heat pump has to be sized for: a standard air-to-water heat pump copes comfortably in an insulated house.
Frost is possible until early April and returns from early November, which leaves about 204 frost-free days; tender crops such as tomatoes, beans and squash go outside once early April is past. Days above 30 °C are rare, so summer care is mostly steady watering.
With a mean wind of 3.2 m/s at 10 m, a small rooftop turbine would produce little in Glasgow; the roof is better used for solar. The southern horizon is open (at most 1.1°) in PVGIS's elevation model, so low winter sun reaches roofs unless nearby buildings block it.
Compared with Edinburgh, 67 km away, Glasgow has 7% less solar yield, 17 fewer frost-free days and a heating need 2% lower. Compared with Dundee, 104 km away, Glasgow has 9% less solar yield, as many frost-free days and a similar heating need.
| Month | Mean temperature | Solar output, 3 kWp |
|---|---|---|
| January | 3.4 °C | 72 kWh |
| February | 3.6 °C | 132 kWh |
| March | 4.8 °C | 213 kWh |
| April | 7.3 °C | 309 kWh |
| May | 9.7 °C | 351 kWh |
| June | 12.7 °C | 321 kWh |
| July | 14.4 °C | 324 kWh |
| August | 13.5 °C | 285 kWh |
| September | 12.1 °C | 225 kWh |
| October | 9.5 °C | 162 kWh |
| November | 5.9 °C | 105 kWh |
| December | 3.4 °C | 63 kWh |
Frequently asked questions — Glasgow
How much could solar panels generate in Glasgow?
A well-oriented 3 kWp rooftop array in Glasgow produces about 2,559 kWh a year, worth roughly £640 in self-consumption. A 6 kWp system reaches about 5,118 kWh/yr where the roof allows. Smart Export Guarantee (SEG): your supplier pays for surplus solar exported to the grid, plus 0% VAT on residential solar PV and battery storage until 2027.
Is rainwater harvesting worth it in Glasgow?
Yes. A 60 m² roof in Glasgow can capture about 70,329 litres a year for the garden, WC and washing machine. Keep harvested rain separate from drinking water and fit a first-flush diverter. Many UK water companies offer subsidised or free water butts; on a metered supply, harvested rainwater cuts your water bill directly.
What grants help with low-carbon heating in Glasgow?
Boiler Upgrade Scheme: £7,500 towards an air-source heat pump (England & Wales); ECO4 and the Great British Insulation Scheme fund insulation, plus 0% VAT on heat pumps. Insulate first — a heat pump only pays off in a well-insulated home (3,520 heating-degree-days here), so prioritise the roof and walls before sizing the unit.
How much food can a garden grow in Glasgow?
With about 204 frost-free days, a 100 m² garden in Glasgow yields roughly 230 kg of fresh fruit and vegetables a year — a partial share of a household's needs, not full calorie autonomy. Council allotments (Allotments Act) give cheap growing plots; RHS and community-garden schemes support home food production.
When is the last frost in Glasgow?
Frost is possible until early April and returns from early November, which leaves about 204 frost-free days; tender crops such as tomatoes, beans and squash go outside once early April is past.
How much does solar produce in winter in Glasgow?
December is the weakest month: a 3 kWp array makes about 63 kWh, against 351 kWh in May. November to February add up to 15% of the yearly total.
How this score is calculated
Public climate data (PVGIS, European Commission) weighted by how vital each dimension is. The score sharpens once you enter your own home. See the full methodology.
Sources
- Solar energy — Source: PVGIS 5.2 (EU Joint Research Centre), optimal tilt and local horizon.
- Rainwater — Source: NASA POWER, MERRA-2 corrected precipitation.
- Food growing — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (frost dates).
- Low-carbon heating — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (base 18°C).
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