Fluctuations in monthly bill amounts are normal. Many factors influence the amount of your bill. For example:
Kilowatt-hours used -- When comparing your monthly bills, it's best to look at the kilowatt-hours (-kWh-) of electricity used. The Energy Use Profile on your bill provides a graphic representation of your month-to-month usage pattern, in average kWh per day, so you can easily spot fluctuations.
The condition of energy equipment/appliances – While CL&P is responsible for providing the equipment to the point where electricity enters your residence, and for installing a meter to accurately record energy usage, you are responsible for the use and condition of the appliances and equipment beyond the meter. You need to be alert for the possibility of faulty wiring conditions or improperly operating appliances or equipment. They can cause an increase in the amount of energy you use, which will be add to your bill.
The time of year, length of the billing cycle, and rates – The time of year, length of the billing cycle and changes in rates may all have an impact on the amount of your bill.
Estimated bills – We typically read your meter every month. But, sometimes we are unable to read your meter. At these times, we issue an estimated bill. If a reading is estimated too high or too low, the billing will be corrected when the next actual reading is taken. Your current bill may appear higher or lower than usual because of previous low or high estimates.
Seasonal use – Changes in weather will affect the amount of your electric bill. For example, that unexpected cool and rainy weekend might have prompted you to turn on the heat for the first time in six months, but since it was a time of year when you wouldn't have expected to use the heat, you may have forgotten about it until the result showed up in your bill. The same is true for air conditioning, electric space heaters, dehumidifiers and other seasonally-used items.