I have just the opposite "problem."
About four months ago, my electric bill, which is usually THB 5K or more, was only a couple hundred baht. I had no idea what had happened, but I thought it might be some sort of rebate from the government. However, the next month, it was the same, only a couple hundred baht. I also noticed then that the meter reading was very low.
I had my wife (Thai) tell the electric company that we think the bill is incorrect and suspect the meter is malfunctioning. But nothing has changed for the past two months, even though my wife reminds them every time we get a bill.
So, who knows what's going to happen? 😦