I found a mysterious spike in my electricity usage, and I’m trying to find the cause. After 6 months in my current flat I checked the meter and was under the expected amount. 6 months later (today) I checked again, and I found that the meter was really far above the expected amount. The excess is quite large, about 6 times the expected use in a given month. My roommates and I haven’t changed anything or added any appliances.
How can I find the cause of this issue?