Not on their own. But it is possible when combined with a time of use tariff and energy storage – depending on the time of use tariff and smart export guarantee rates. For example, Octopus Go tariff pays 5.5p/kWh for every unit exported and charges 5p/kWh for off-peak use from 00:30 – 04:30. You could install solar panels that generate the equivalent of 100%+ of your electricity consumption and earn 5.5p/kWh for every unit exported to pay for topping up the batteries in the winter at 5p/kWh. Your bills could even go negative if you can generate more than you use! Time of use tariffs are why we have smart meters so expect them to become more common in future.