In many countries, such as Nepal, Ghana or India it is common to have "Load Shedding," a rolling blackout for areas to save electricity.
I first experienced in Kathmandu, Nepal, the locals said,
"We make the electricity, and our government sells it to India."
Today is Thursday, every Thursday we have no electricity in our neighborhood because there is not enough to share. Funny, they called it "Load Shading."
2011 February, I am in Accra, Ghana they say to me,
"It will come sooner or later."
-- Today appears to be Load Shedding day in Accra, there is a never-ending list of reasons to avoid Accra, Ghana.
Load Shedding Defined: A rolling blackout, also referred to as load shedding, is an intentionally-engineered electrical power outage. Rolling blackouts are a last-resort measure used by an electric utility company in order to avoid a total blackout of the power system. They are usually in response to a situation where the demand for electricity exceeds the power supply capability of the network. Rolling blackouts may be localized to a specific part of the electricity network or may be more widespread and affect entire countries and continents. Rolling blackouts generally result from two causes: insufficient generation capacity or inadequate transmission infrastructure to deliver sufficient power to the area where it is needed.
In many African, South Asian and Latin American countries (e.g. Bangladesh, India, Yemen, Nepal, Pakistan, Cameroon, Democratic Republic of the Congo, Nigeria, South Africa, Egypt, Zimbabwe, and Dominican Republic) rolling blackouts are a staple of daily life. This is because electricity in those areas is very limited or electricity infrastructure is of inferior quality. Sometimes, these blackouts are scheduled at fixed times of the day and week, allowing people to work around the known interruption times. In most other cases, the blackouts may happen without any advance notice, typically when the transmission frequency falls below the 'safe' limit.