The answer to 'why is my electrical meter dimming lights' is that a dimming electrical meter is often a sign of an overloaded electrical system. When your home's electrical demand exceeds the capacity of your electrical service, the voltage can drop, causing lights to dim.
Some common causes include too many high-wattage appliances running at the same time, faulty wiring or electrical components, or a problem with the utility's power supply. Symptoms may include flickering or dimming lights, especially when certain appliances turn on.