Homes / small-scale assets
The quiet build-out.
Solar, batteries and heat pumps are spreading through homes and local networks. The numbers below use the latest official series available for each technology.
Read the dates
These datasets have different scopes and publication cycles. A measured period is never presented as an all-time total.
Three markets, three different measures
The comparable story is momentum—not a single combined total.
Domestic solar · May 2026
1.70m
6.76 GW installed
Retrofit batteries · Mar 2026
44,033
Installations in Apr 2025–Mar 2026
Retrofit heat pumps · Q1 2026
10,693
Hydronic systems up to 45 kW
Battery growth
+82%
FY 2025/26 versus FY 2024/25
Solar is already a mass-market asset
The DESNZ series combines multiple administrative sources, not just MCS certificates.
More than 1.7 million domestic solar installations now appear in the official count.
- Whole UK fleet
- 22.6 GW · ~2.05m sites
- Added during 2025
- 2.6 GW · 269k sites
- May 2026
- 18,620 sites · 12,000 residential
The latest month is provisional and can be revised. Some unsubsidised systems below 150 kW may still be missing despite broad coverage across MCS, network registers, renewable certificates and subsidy schemes.
Domestic batteries are accelerating—and getting cheaper at scale
The official cost series includes the battery, installation, network connection and VAT, but not any paired solar panels.
| Usable size | Sample installs | Sample capacity | Median installed cost |
|---|---|---|---|
| 1–5.99 kWh | 16,270 | 84 MWh | £1,300/kWh |
| 6–10.99 kWh | 14,457 | 142 MWh | £890/kWh |
| 11–29.99 kWh | 12,176 | 189 MWh | £630/kWh |
March 2026 alone recorded 5,774 installations. Capacity is available for 42,903 of the 44,033 installations in the financial year, totalling 414 MWh.
Heat-pump momentum cooled in early 2026
This series covers UK retrofit hydronic heat pumps up to 45 kW; it excludes new-build and non-domestic systems.
Q1 2026
10,693
Retrofit installations
Air or water source
10,625
99.4% of the quarter
Quarter on quarter
-18%
Versus Q4 2025
Year on year
-22%
Versus Q1 2025
Source ledger
Direct links to the publications behind every number on this page.