Kum & Go knows the pain of this math. Ken Kleemeier, its vice president of fuels, gives the example of a 150-kilowatt charging session with a $6 demand charge. Six dollars times 150 kilowatts means the electricity bill is $900. But “we charge the customer $10,” Kleemeier said. “That’s a $900 loss. That’s where the demand charges are painful. There’s no feasible way to pass that along.”