The Society of Motor Manufacturers and Traders has recorded a 36% increase in renewable electricity generated at UK automotive manufacturing sites during 2025.
Vehicle manufacturers and suppliers produced 80.4GWh from onsite renewable installations, the highest annual total recorded by the industry body. That output was equivalent to the annual electricity consumption of more than 32,000 homes and avoided an estimated 14,000 tonnes of carbon dioxide emissions.
Solar arrays account for much of the visible investment across automotive factories, although the generation mix can also include wind, biomass, biogas, and energy recovered from industrial processes. Onsite projects give plants control over part of their electricity supply and can reduce exposure to market volatility when generation aligns with production demand.
The sustainability assessment also found that 93% of waste produced by the sector was reused or recycled, while green electricity purchased through the grid represented 36.5% of consumption. Together, those figures show that factory decarbonisation is extending beyond individual solar installations into procurement, process efficiency, and material recovery.
Automotive businesses supported more than 6,000 apprentices and trainees during the year, while 27 zero emission vehicle models were either in production or announced for UK manufacture. Those programmes connect energy investment with the transition to electric drivetrains, batteries, power electronics, and increasingly automated production systems.
Renewable generation remains constrained by the physical characteristics of individual sites. Large factories may have extensive roofs and adjacent land, but structural loading, orientation, shading, planning conditions, lease arrangements, and the age of existing electrical infrastructure can limit the available capacity.
Grid connections present a more persistent obstacle for projects requiring greater import or export capability. The SMMT said some manufacturers could face waits of up to 15 years for major connection upgrades, leaving factories able to install generation more quickly than the network can accommodate its full output.
Storage, demand management, and private wire systems can improve the use of onsite electricity. Batteries can absorb surplus solar output and release it during periods of peak demand, while flexible production loads may be scheduled around periods of higher generation.
The commercial case varies between plants because operating hours, connection agreements, tariffs, and process demand differ considerably. A facility running several shifts may consume a high proportion of solar output onsite, whereas a plant with a more intermittent schedule may need storage or an export arrangement to avoid wasting generation.
Automotive production is also adopting more sophisticated digital systems to improve equipment and energy performance. Work including BMW’s application of physical artificial intelligence within production environments shows how factories are combining energy investment with robotics, simulation, and data-led process control.
Total electricity consumption will not necessarily decline as plants decarbonise. Paint shops, heat treatment, compressed air, machine tools, ventilation, and material handling already create substantial loads, while the replacement of gas-fired processes with electrical alternatives can increase demand further.
Battery and power electronics production introduces additional energy requirements through drying, clean manufacturing, controlled environments, formation, testing, and thermal management. Greater electrification can therefore reduce direct fossil fuel use while placing more pressure on factory connections and local network capacity.
Onsite generation offsets part of that demand but cannot resolve the wider problem of industrial electricity prices. Sites with limited land or unsuitable roofs may depend more heavily on power purchase agreements and grid-supplied renewable electricity than plants able to develop large solar installations.
Comparing environmental performance between factories also requires consistent measures. Output volumes, product mix, vertical integration, weather, and the proportion of energy intensive processes completed onsite can alter annual figures. A reduction in vehicle production may lower total consumption while worsening energy use per unit because base loads remain.
The rise to 80.4GWh nevertheless demonstrates that renewable generation has moved beyond isolated demonstration projects within UK automotive manufacturing. Larger installations are now being combined with lighting upgrades, heat recovery, compressed air improvements, building controls, and process electrification.
Future growth will depend on whether manufacturers can obtain planning consent, finance equipment, and secure network capacity on timescales that match investment decisions. Additional generation offers limited benefit when substations, transmission assets, and local distribution networks cannot accommodate changing patterns of industrial power flow.
Energy cost, carbon intensity, connection certainty, and infrastructure delivery now sit alongside labour, logistics, and supplier capability when manufacturers decide where to place new models. British plants are increasing their own generation, but the speed of grid reinforcement will determine how far factory-level investment can progress.
