Sure, but they why kWh/h instead of kW? If you're inclined to measure the quantity of gas in terms of its energy, why not measure its flow in terms of power? (of course kWh/h _is_ power, but why denote it so strangely?)
Similarly, we don't need power of the transfer of the gas, we need to know how much gas gets exchanged, because it's priced per kWh, so removing h from each side actually makes things harder in another equation.