Best answer by Tim_OVO
Updated on 08/01/20:
Thanks for chasing up this outcome,
As you mentioned, our Help Centre article confirms:
Download energy use data
We’re sorry but you can’t download your energy use data online yet – we’re working on making this happen. If you’d like a copy for your records, the only way to do this is copy and paste the data or to print the screen from your browser.
Our online account and billing platform has been built in house. It’s constantly being worked on. This is one of the features on that list.
Another that’s on the list is the publishing of a public API and its documentation. More on that soon, but in the meantime, please see this topic:
Some members of this community have created a workaround to allow usage data to be downloaded.