[snowwindwaves]

No. Because if there is too much power demand the overload results in some people getting no power. You dont often hear of rolling blackouts or brownouts in North America.

Everyone can use as much power as they have subscribed to whenever they want. Your panel is rated for a certain amount of power and protected by a breaker or fuse if too much is used. Same for the transformer your panel is connected to. Same for the distribution line your transformer is connected to. Same for the transformer it is connected to. And so on.

There is enough capacity in the system to meet the demand. If there wasn't the lights go out due to some overload.

When demand grows more capacity has to be added before the limit is reached. Capacity takes years to build. Utilities have planning departments that decide where they need to add capacity next and how much.