What are the causes of load shedding or rolling blackouts?

Rolling blackouts is a common term for load shedding.

Relating to the area of electricity, when the supplying company receives more demand than its installed capacity, or the available electricity pool at any given moment, the company then resorts to rationing of available electricity to its customers. This act is called load shedding.

Some causes (but not always the case):

• The country cannot afford to build a power plant large enough to fit their people's needs
• Bad government policies
• Some countries impose additional load shedding on average civilians so they can give increased power to the government and the rich.
• Low fuel supplies
• Increased demand due to extreme weather