Metis in numbers: how funded retrofit is saving households £1,105 a year

Summary

After a full year in live operation, the Oxfordshire Area-Wide Retrofit Programme, delivered by Metis, has achieved:

• Average gross system savings of £1,105 per household per year
• Solar and battery systems meeting 89% of household energy demand in spring, 77% in summer, 51% in autumn and 37% in winter.
• 96% resident uptake of the tariff recommended by the Metis Switching Engine
• Resident tariff matches across 4 energy suppliers, 23 import tariffs and 9 export SEG tariffs

Removing upfront cost is helping Metis households save £1,105 a year

Metis is making low-carbon retrofit accessible to households that are ready to decarbonise, without asking them to fund solar PV and battery storage upfront.

The first year of live installation data shows what that model unlocks. Participating Oxfordshire households are now achieving average gross system savings of £1,105 per year, across summer generation peaks, winter energy stress and normal household routines.

Those savings are also continuing beyond the point of installation. As systems are optimised, households settle into everyday usage patterns and the right tariffs are maintained, Metis’s retrofit model is showing how funded retrofit can deliver measurable, durable savings in normal domestic settings.

Metis isn’t just lowering bills, we’re reducing household exposure to grid volatility

The immediate financial savings are only part of the value. By combining solar PV and battery storage, Metis is also helping households meet more of their energy demand without relying on grid-supplied energy.

Across live homes, solar and battery systems are meeting:

• 89% of household energy demand in spring
• 77% in summer
• 51% in autumn
• 37% in winter

That winter figure is important. Even when generation is lower and household energy use is higher, participating households are still meeting more than a third of their energy demand through their own system.

This is not about taking homes off-grid. It is about reducing exposure to grid volatility, so households are less affected by seasonal price spikes and have more predictable annual energy costs.

Tariff optimisation is helping households turn installed technology into sustained value

Our work doesn’t stop at installation. The Metis model combines solar PV, battery storage, tariff management, optimisation and resident support, so households are not left to manage performance on their own.

That matters because the £1,105 average gross saving is not driven by technology alone. It is also supported by active tariff optimisation.

Over the first 12 months, 96% of residents switched to the tariff recommended by the Metis Switching Engine. Those residents were matched to the right tariff for their home, rather than placed on a single standard option.

Across the programme, households were matched across:

• 4 energy suppliers
• 23 import tariffs
• 9 export SEG tariffs

This is where the delivery model makes a measurable difference. Different homes have different usage patterns, generation profiles and export opportunities, so the right tariff can directly affect the value residents receive.

By managing optimisation, support and long-term performance as part of the service, Metis helps households keep getting value from their system after installation day.

Our funded retrofit model works because delivery is owned end to end

The first year of live operation shows that strong outcomes depend on more than installing the right technology.

Capital, installation, systems, tariff optimisation and customer experience all need to work together. When they do, the resident experiences one joined-up journey, not a chain of hand-offs.

That end-to-end ownership is what helps the model keep performing. Assets are installed correctly, continuously optimised and supported for the long term. For residents whose homes are retrofitted by Metis, that means less complexity and more confidence. For partners, it means retrofit can be treated as infrastructure, not a one-off product sale.

One year of data shows our model can scale across housing, local authority and government programmes

The first year of live data shows that funded, whole-system retrofit can work beyond individual households.

For Housing Associations, it points to a model that can support resident savings and resilience without asking tenants to fund solar PV and battery storage upfront.

For Local Authorities, it shows how low-carbon retrofit can be made easier to access across local communities. By removing the upfront cost and credit burden from households, councils can support decarbonisation, reduce exposure to grid volatility and make programmes more practical to scale.

For government, it provides operational evidence that private finance can help deliver public outcomes. Funded retrofit can lower household energy costs, reduce pressure on local energy systems and support the wider energy transition without relying on households having the capital to self-fund.

Contact the Metis team to learn more about scalable low-carbon retrofit delivery.