If you live in the UK, you can sign up to https://glowmarkt.com/ https://glowmarkt.com/ and they'll give you the same 30 minute time slices, or you can buy one

If you live in the UK, you can sign up to https://glowmarkt.com/ https://glowmarkt.com/ and they'll give you the same 30 minute time slices, or you can buy one of their in-home devices for £70 (https://shop.glowmarkt.com/products/display-and-cad-combined-for-smart-meter-customers https://shop.glowmarkt.com/products/display-and-cad-combined...) and it'll push your usage every 10 seconds to MQTT to give you very interesting if completely useless graphs in Home Assistant. (Not sponsored, I just use it)