Electricity has the same identity of fluid flowing through pipes. We generally get very poor voltage as our house located near dead end of the electric pole. I get as low as 110V. If some home is consuming excess power ahead of my home, then the line will have a potential drop aka as low voltage. This is more noticible in the dead end of the pole, we get flickering of the lights for a moment, if the house before my home turns on the A/C. We just get enough power to run the A/C just similar of using hand pump to pump the water which is left in the pipe. When I run the A/C the house in front never sees such flickering unless it has a badass voltage drop 100~130V. You are not overusing the quota. The transformer capacity already reached when the potential drop drops to 200V. The problem is if the powerline has 50 houses and each house sanctioned 3Kva power then the transformer atleast have 200Kva capacity to cope up new houses in the future. If the transformer is only 50Kva just think how much it will be loaded. No house will use 3000Watts of power at any given time. It is the night where we use A/C's which consumes 1500Watts or 1.5Kva (considering PF=1) , Ultimately we get low voltage. Now I have used excess triple booster for the entire home stabilizer