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The growtronix has this built into it. when you add a new device you tell it what its wattage is and what your paying for a KW and it calculates out the cost
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I'm not surprised for the cost of it. But until I can afford the growtronix system I will get one of the "Kill a Watt" devices. You don't need to know wattage or amperage either, it automatically knows what it is when you plug the electronic device into it. That comes in handy if you don't know how many watts your toaster oven is, fridge, microwave, TV, computer, printer, electric razor etc.. The amount you pay for a KW is on the electric bill, and it's the same amount for every appliance. So it's real simple to use.