SMS is a UK-based energy technology and services company delivering end-to-end low-carbon energy solutions across infrastructure, metering, data, energy services, residential retrofit, and grid flexibility. It is the UK's leading independent metering provider, designs and delivers electrical, gas and water utility infrastructure, offers data collection and analytics services, and operates the FlexiGrid virtual power plant platform for grid flexibility, alongside funded solar PV, battery storage, and residential decarbonisation programmes.