Energy
The Energy page (sidebar, between History and ESPHome) is Athena's own take on Home Assistant's Energy dashboard: assign a handful of already-connected sensors to a role - grid, solar, gas, water, or an individual device - and get today/this-month totals, 30-day charts, and a rough cost estimate, all built on top of every reading's own long-term history.
Configure: assigning roles
"Configure" opens a picker limited to entities another integration already reports with an energy or monetary device class - Helen, Caruna, Fortum, Cozify HAN, HomeWizard Energy, Nord Pool, and PörssÀri all qualify automatically, with zero setup on this page itself. Pick a role, pick the entity, optionally give it a label, and add it:
- Grid consumption / Grid return - what you draw from and sell back to the grid.
- Solar production - your own panels' output.
- Gas / Water - any other metered utility.
- Individual device - add as many of these as you like, each its own tracked consumer (a heat pump, an EV charger, anything with its own energy sensor).
- Spot price - an optional Nord Pool/PörssÀri price entity, used only for the cost estimate below.
Grid/solar/gas/water are meant to have one active assignment each - adding a second one doesn't delete the first, it just means the view above only reflects whichever you added most recently until you remove the old one yourself.
The main view
Each configured role gets today-so-far and this-month-so-far totals, live-updated the same way the underlying statistics always work (a day or month figure always reflects everything counted so far, not a value frozen at midnight), plus a 30-day daily bar chart. Grid consumption and grid return, if both are configured, are netted against each other into a single "net usage" figure - the same idea as Home Assistant's own Energy dashboard, so a day with strong solar production and export can show as near-zero or even negative net grid use.
Cost estimate
If you've also assigned a spot-price entity, the page shows a rough cost estimate: the mean spot price over the period multiplied by total net consumption. This is deliberately an approximation, not a real bill - it doesn't match hourly prices to hourly usage the way an actual utility invoice does, it's a quick "roughly what did today/this month cost" figure. Skip assigning a spot-price entity if you'd rather the page not show a cost figure at all.