UI meter helper kwh

Hello,
I have following sensor:
image
I guess this is the grant total of kWh returned to the grid.

I found that I can create a helper to create a helper kWh per day.
But the value stays 0

Am I doing something wrong?

Regards,
Ward

Did you wait one full day before asking your question?

No… I taught the helper would use my historical data…

No, it doesn’t.