It appears that kilowatt cards are priced at "$3.50 or less", which removes the actual advantage of using energy as money. If they were really good for deliver

It appears that kilowatt cards are priced at "$3.50 or less", which removes the actual advantage of using energy as money. If they were really good for delivery of energy, this would incentivize people to move energy from places it's now cheap to places it's expensive. By removing the possibility for arbitrage they've destroyed most of the point.