One question I have, reading some of the UK "energy digitalisation" plans is: are there plans for a standardised consumer-level APIs for things like energy cost?

Apple, for example, has a bunch of facilities that can change how devices work according to current energy cost (EnergyKit, introduced in 2025) - but nothing works outside the US.

(Their support for OpenBanking shows they can add national-level APIs if they're available.)

https://www.gov.uk/government/publications/energy-digitalisation-framework-a-vision-for-a-coordinated-and-connected-energy-system

Energy digitalisation framework: a vision for a coordinated and connected energy system

Delivering the digitalisation of the energy system in a coordinated and connected way.

GOV.UK

EnergyKit is documented here:

https://developer.apple.com/energykit/

EnergyKit - Apple Developer

EnergyKit provides a grid forecast for apps to help people choose when to use electricity by identifying times when there‘s relatively cleaner electricity on the grid.

Apple Developer

Incidentally, this (datasets for energy cost and carbon impact) is mentioned as one of the future government Smart Data programmes - designs in 2026 and regulations in 2027/2028.

https://www.gov.uk/government/publications/smart-data-strategy

Smart Data Strategy

This strategy sets out the long‑term vision for smart data in the UK, and the actions government will take to unlock growth, competition and innovation through secure, trusted data sharing across the economy.

GOV.UK