Autonomy scoreLocal analysis
Derby Home autonomy potential in Derby (England)
The strongest asset here is Solar energy. It is not, however, what pays your home the most: that is Low-carbon heating.
Annual potential, standard home
£4,438
Four items added up — each one is a separate decision, in whatever order suits you.
Overall score
53 /100
Growing
Derby: 53/100 achievable autonomy with a recommended setup.
Solid potential — real, achievable gains in energy, water & food autonomy await.
What you could reach in Derby
A typical home in Derby can reach about 53% 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.
- ≈207 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 — ≈66,215 L harvested from a 100 m² roof covers the garden and toilet flushing, so hosepipe bans stop mattering.
- A real harvest — ≈241 kg of fresh vegetables over a ≈213-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 heating41/100
~£2,731/yr
less heating after insulation + heat pump (−9,450 kWh/yr on 90 m², electric heating)
The detail
Realistic outlook
3,030 heating-degree-days: a high-efficiency heat pump is the lowest-carbon way to keep Derby 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) : ≈ 3,030 HDD — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (base 18°C).
-
Solar energy55/100
~£738/yr
less electricity with 3 kWp on your roof (≈2,952 kWh/yr)
The detail
Realistic outlook
At 984 kWh/kWp per year, Derby 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 : 984 kWh/kWp — Source: PVGIS 5.2 (EU Joint Research Centre), optimal tilt and local horizon.
-
Food growing55/100
~£709/yr
off the weekly shop — up to ≈241 kg/yr of fresh vegetables from 100 m²
The detail
Realistic outlook
With about 213 frost-free days, a household garden in Derby 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 : ≈ 213 days — Source: PVGIS, hourly ERA5 temperatures 2005–2015 (frost dates).
-
Rainwater54/100
~£260/yr
less mains water with a 5,000 L tank (≈66,215 L/yr harvestable from a 100 m² roof)
The detail
Realistic outlook
779 mm of rain a year makes rooftop rainwater harvesting worthwhile in Derby.
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 : 779 mm — Source: NASA POWER, MERRA-2 corrected precipitation.
£4,438
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 Derby
Estimate your solar system in Derby
Based on a local yield of 984 kWh/kWp per year.
Indicative estimate (production = kWp × local yield). Real output depends on roof orientation, shading and your self-consumption rate.
What is specific to Derby
In Derby, the housing built for mill and railway workers still shapes what can go on a roof. The cottages on Railway Terrace, occupied by 1843, are believed to be the earliest purpose-built homes for railway workers, narrowly predating Swindon's railway village, and they are listed. At Darley Abbey, mill workers' houses survive in The Square, Brick Row and Lavender Row, and the conservation area was extended in 2003 after research into the village's place in the Derwent Valley Mills World Heritage Site.
Across Derby's sixteen conservation areas, from Friar Gate to the old village centres of Spondon and Mickleover, solar panels, cladding and render come under tighter permitted-development limits. The council's 2016 guidance lists Article 4 Directions in ten of them, including Little Chester, Strutt's Park and Hartington Street, so altering street-facing doors, windows or roof coverings needs planning permission. A 2009 residents' guide to Strutt's Park and Little Chester notes that blue-grey slate, mostly from north Wales and the Lake District, was the usual roofing until the 1890s, and that concrete tiles and artificial slate are not acceptable substitutes. Rather than double glazing, it recommends overhauling and draught-proofing old sash windows or adding secondary glazing.
The whole city is a smoke control area, so wood burners must be exempt appliances and open fires may burn only authorised fuel, with fines of up to £1,000. In July 2025 the developer 1Energy pledged £100m, on top of £23m from the government, to the Derby Energy Network, which would use water-source heat pumps to recover surplus heat from local businesses. Partners include the council, the Royal Derby and Florence Nightingale hospitals, the University of Derby and Derby College, and construction was then due to start in 2026. The council's Local Area Energy Plan, funded by the East Midlands Combined County Authority, will map high energy use and where insulation or low-carbon heating is needed.
The council's Home Energy Advice Service holds a drop-in at the Council House on the third Wednesday of each month. YES Energy Solutions, a not-for-profit approved by the council, delivers the city's Warm Homes: Local Grant in areas identified by the government, including Boulton, Allenton, Mickleover, Oakwood and Little Chester. During the East Midlands Festival of Retrofit, the council runs a free Future Ready Homes drop-in at QUAD on Thursday 5 November 2026.
The Environment Agency declared drought in the East Midlands on 15 July 2025, and its report for 9 to 15 October 2026 lists the area as in drought, yet Derby's water company, Severn Trent, had no hosepipe ban in force. Most allotment sites, from Ashbourne Road and Rowditch to Sinfin Moor, are run by associations that set their own rents, typically £40 to £70 a year for a full 250-square-metre plot. Chickens and bees are not allowed on council-owned sites, though some private sites accept animals.
Sources
- Derby City Council – Railway Conservation Area
- Derby City Council – Darley Abbey Conservation Area
- Derby City Council – Conservation areas
- Derby City Council – Conservation area FAQs (August 2016)
- Little Chester and Strutt's Park Conservation Areas – residents' guide (2009, updated 2014)
- Derby City Council – Air quality
- Transport & Energy – £100m pledge for Derby low-carbon energy network (16 July 2025)
- Derby City Council – Council climate actions
- Derby City Council – City climate actions
- Derby City Council – Home energy advice
- YES Energy Solutions – Derby Warm Homes Local Grant
- East Midlands Combined County Authority – Festival of retrofit
- GOV.UK – West and East Midlands move into drought (15 July 2025)
- GOV.UK – Dry weather and drought in England: 9 to 15 October 2026
- Derby City Council – Emergency flooding contacts
- In Derby (Derby City Council) – Allotments
Facts checked on 21 October 2026.
Climate month by month in Derby
In Derby, a 3 kWp array pitched at 41° and facing 5° east of south — the optimum PVGIS computes for this location — produces about 2,952 kWh a year. May is the strongest month, at about 357 kWh, and January the weakest, at 111 kWh. November to February bring 18% of the year's output — enough for a battery to cover winter evenings on sunny days, not through grey spells.
The heating season runs from September to June: 10 months average below 15 °C, and February is the coldest at 3.9 °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 mid-April and returns from mid-November, which leaves about 213 frost-free days; tender crops such as tomatoes, beans and squash go outside once mid-April is past. Days above 30 °C are rare, so summer care is mostly steady watering.
Mean wind at 10 m is 4.1 m/s: borderline for a small turbine, which would need an exposed, unobstructed mast to pay off. The southern horizon is open (at most 2.3°) in PVGIS's elevation model, so low winter sun reaches roofs unless nearby buildings block it.
Compared with Nottingham, 22 km away, Derby has the same solar yield, as many frost-free days and a similar heating need. Compared with Leicester, 39 km away, Derby has 1% less solar yield, 8 fewer frost-free days and a similar heating need.
| Month | Mean temperature | Solar output, 3 kWp |
|---|---|---|
| January | 4.2 °C | 111 kWh |
| February | 3.9 °C | 159 kWh |
| March | 5.6 °C | 261 kWh |
| April | 8.5 °C | 327 kWh |
| May | 11.3 °C | 357 kWh |
| June | 14.4 °C | 339 kWh |
| July | 16.5 °C | 354 kWh |
| August | 15.7 °C | 324 kWh |
| September | 13.8 °C | 279 kWh |
| October | 11.1 °C | 192 kWh |
| November | 7.0 °C | 138 kWh |
| December | 4.6 °C | 111 kWh |
Frequently asked questions — Derby
How much could solar panels generate in Derby?
A well-oriented 3 kWp rooftop array in Derby produces about 2,952 kWh a year, worth roughly £738 in self-consumption. A 6 kWp system reaches about 5,904 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 Derby?
Yes. A 60 m² roof in Derby can capture about 39,729 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 Derby?
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 (3,030 heating-degree-days here), so prioritise the roof and walls before sizing the unit.
How much food can a garden grow in Derby?
With about 213 frost-free days, a 100 m² garden in Derby yields roughly 241 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 Derby?
Frost is possible until mid-April and returns from mid-November, which leaves about 213 frost-free days; tender crops such as tomatoes, beans and squash go outside once mid-April is past.
How much does solar produce in winter in Derby?
January is the weakest month: a 3 kWp array makes about 111 kWh, against 357 kWh in May. November to February add up to 18% 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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