I just jumped in this topic as i was “fiddling” with custom:header-card
In Regards to energy-data in common there are lots of “choice”, depending upon what you want to have an overview over, and how , it all comes to ones “taste” and opinion, using different cards/views and using card-mod.
as for the header-card, it will have 2 rows as shown above, another card worth mention is custom:history-explorer-card.
Works with “sensors” of different “measurements” and “graphs/staples/time-line”
For “inspiration” custom:history-explorer-card in a Panel-View mode , and as a single card “cut out of another standard-View, with 3 columns”
