We used to be on Octopus Agile tariff at times they would pay us to import electric, we have solar panels, battery and an EV charger, this worked fine in the winter when it was windy and our solar panel were mere roof ornaments, in the spring and summer we were generating far more consumed adding to the problem.
We have switched back to Octopus Go they now pay 15p @ kWh for export, we charge the PHEV and solar battery up off peak at night 8.5 p @ kWh balancing out the grid, this financially works for us in the winter, however in the spring/summer, again we are adding to the problem.
An alternative is to allow the energy companies to control your solar battery to balance the grid, somehow I just don't fancy that.