Yes and no. In a perfect world no, you wouldn’t be charged for power not used. This is assuming they actually get a reading from you meter. Most power companies don’t get to all of the houses in time for their billing cycle, so they charge you based on your past power usage for that month. If you see your bill it should show you how much power you have used (or they think you used). You can check your own meter and make sure the numbers match, if they don’t call them and make them come out and check it before you pay the bill. However if you do pay it but didn’t use that amount of power in theory when they do eventually make it out to your meter it should be corrected on the next bill (ie the next bill would be cheaper to make up the difference). Example say they think you used 100mwhr in one month, but you only used 75, the next month if you actually used 100mwhrs they would only charge you for 75 of those making up the difference (175 for 2 months instead of 200 for 2 months). I know that’s an over simplification, but that was on purpose to demonstrate the point lol.