READ MY LIPS! THIS IS NOT ABOUT GENERATION OR TRANSMISSION!!! This thread is about local distribution. Before anyone posts another comment about the time related excess capacity in generation and transmission learn the difference between transmission and distribution. A good example is the telephone network. They phone system has layers of interconnection. If a phone in Frederick, MD wants to talk to a phone in Fremont, CA, the Frederick phone is connected to a switch in Frederick which connects that phone to a trunk which takes the call to Baltimore where another switch connects it to another trunk that connects to a switch in Chicago, which uses another trunk to connect to a switch in Oakland, etc until it reaches the switch in Fremont that connects to the phone there. As the call goes up the tree to a main trunk, capacity can be maxed out at any point, any switch may be overloaded or any trunk lines between switches may be overloaded. So even if the system works just fine 99.99% of the time and the person you are calling only uses the phone 1% of the time, there is a chance you will not be able to make your call because the next town over has a big fire and lots of people are calling to make sure their family is ok. In the same way, adding a relatively small number of relatively heavy loads can overload a nearly maxed out local distribution network on a cold winter night when residential demand is at it's peak. This has nothing to do with the generators on the dam 50 miles away or the transmission lines that Ross Perot said we should have built to carry wind power from the central plains to the coasts. LOCAL DISTRIBUTION. Look it up and learn something about it before you reply. Thanks.