ICP (Installation Control Point) is a unique number that is assigned to every place where an electricity line comes off a power pole. ICPs are 15 digets longs and are a combination of letters and numbers.
Everyone in the New Zealand electricity industry uses them.
There is a national database of them.
When you are moving property and your electricity company is unable to locate the correct ICP# they will ask you to confirm the ICP#.
Slight problem - unless you know everything, you won't know this. And attempting to find your ICP# can be frustrating.
Your Power Company will suggest calling your landlord/real estate agent. I can tell you that 9/10ths of the time these people just won't know.
Option 1) (The Long Option), locate your meter, write down the printed serial number on your meter and call every electricity company and ask them to locate the property. Most will be able to search via meter serial number. This process can take a while.
Option 2) Wait until correspondence from an electricity company arrives at the property, open it, and the ICP# should be located on the letter. WARNING: the company who currently supplies electricity may turn the electricity off so this is a dangerous method.
These are the obvious solutions. Some of the more ... round about ways will be discussed at a later date.