I was on vacation from June 20 till September 19. Nobody was living at my home. My electricity consumption during that time amounted to the insignificant value of about 6.9 amps, (This was verified by an electrician I hired for that purpose), which if calculated correctly, comes to about 597 KWH per month for the three months of June-July, July-August, and August-September.

My Electric meter was actually read on June 21. The reading was 8465.

On August 19 the meter was finally read and the reading showed 9659.

My actual consumption during the two months period was 9659 - 8465 = 1194 KWH (or 597 per month).

The Jersey Central Power and Light (JCPL) wrongly assumed that the meter went a full cycle before reaching its final value. They added (due to their erroneous estimates through that time) another 10000 KWH (just about $2000) to the bill.
When calling them for clarification, I was advised that I should get an electrician and find out how it was possible for me to consume so much electricity (according to JCPL I consumed more than if I had been staying in the house and used my AC all of the time) when to my knowledge nobody was using power during the three summer months. The electrician I hired cost me $128.40. JCPL should refund that amount.
On August 19, JCPL changed the meter on my house. I do not know why they did that.

The bill for the month of August 21 to September 21 (on the new meter) was significantly lower than the erroneous bill for June -July, July - August. But, still, it was almost double of what should be expected, due to the fact that nobody was home, and the electricity consumption was still the same, i.e., 6.9 amps on a daily basis, or just about 597 KWH for that period. I do not understand how this is possible. Is it the function of the new meter? or is it another "erroneous" overcharge?

After the gross overcharge I have experienced I find it hard to trust the JCPL billing. It may be true for other customers.

In conclusion - JCPL method for estimating electricity usage rather than actually reading the meter, may have caused overcharges to other customers who failed to understand how their electrical consumption turned up so unrealistically high.