Economy 7 meters are the most common, but there are other economy meters, such as economy 10. Unfortunately, we can only switch Economy 7 meters. Not sure if you have an economy meter? Economy meters charge different rates at certain times of day. The best way to check is with a recent electricity bill, see how you’ve been charged for energy. If you’re charged two or more different rates, often written day / night or peak / off peak, then you have an economy meter.