“Load-shedding”. As Countries Lose More Reliable Power Sources….this will result.

Rolling blackout

From Wikipedia, the free encyclopedia

Rolling blackouts are a common or even a normal daily event in many developing countries where electricity generation capacity is underfunded or infrastructure is poorly managed. Rolling blackouts in developed countries are rare because demand is accurately forecasted, adequate infrastructure investment is scheduled and networks are well managed; such events are considered an unacceptable failure of planning and can cause significant political damage to responsible governments. In well managed under-capacity systems blackouts are scheduled in advance and advertised to allow people to work around them but in most cases they happen without warning, typically whenever the transmission frequency falls below the ‘safe’ limit. Rolling blackouts are also used as a response strategy to cope with reduced output beyond reserve capacity from power stations taken offline unexpectedly such as through an extreme weather event.


In January 2014, the Canadian province of Newfoundland & Labrador renewed rolling blackouts to compensate for the cascading failure of the Holyrood generating station after a fire at the Sunnyside substation on Jan 4 following a blizzard. The rolling blackouts started before the storm on the 4th, rather were caused by extreme cold weather and a high demand for power at the time.[1]

On 9 July 2012, the Alberta Electric System Operator ordered power companies in the province of Alberta to institute rolling blackouts during a heat wave as six generating plants failed during peak demand in the heat of the afternoon. Because the shortage increased the amount consumers paid to generators, Members of the Alberta Legislative Assembly voiced concerns that price manipulation might have been involved[2]

In both cases the blackouts were rolled fairly rapidly, so that no area had to spend more than one hour without power.[1][2]


Summer blackouts have been common in Egypt since 2010 but became more severe and widespread after the 2011 revolution. In April 2014, the Minister of Electricity and Renewable Energy said that the problem would take a few years to resolve.[3] The government is blaming on the unrest the country is experiencing for the blackouts. However, blame between the different ministries reveals their poor organization. Some also point to the fact that the infrastructure is old and lacks maintenance.[4]


See main article at dumsor

In Ghana, rolling blackouts occurred in 2007-2008 and again after 2012. At the beginning of 2015, the dumsor schedule went from 24 hours with light and 12 without to 12 hours with light and 24 without.[5]


After the great 2003 blackout in Italy, a rolling blackout program PESSE (it:Piano di Emergenza per la Sicurezza del Sistema Electrico en: Emergency plan for national grid safety) was issued. It has 5 degrees of severity, any controlled blackout can’t exceed 90 minutes.


Due to a chronic shortage of electricity, power-cuts are common throughout India, adversely affecting the country’s potential for economic growth.[6][7] Even in the country’s capital of New Delhi, rolling blackouts are common, especially during the hot summer season when demand far outstrips supply capacity. Rural areas are the most severely affected; it is common for the 44% of rural households having access to electricity to lose power for more than 12 hours each day.[8] The states periodically and chronically affected by load-shedding are Delhi, Uttar Pradesh, Tamil Nadu, Bihar, Odisha, Assam, Maharashtra, Madhya Pradesh,Rajasthan and Andhra Pradesh. The states of Punjab, Goa, Gujarat and Kerala are largely free of any load-shedding due to surplus power. Karnataka still occasionally experiences power cuts.[9]


Rolling blackout in Japan after the 2011 Tohoku Earthquake.

South Africa

There is a long history of rolling blackouts in South Africa, with multiple causes. In South Africa the major producer and distributor of electricity is Eskom, which provides over 95% of the country’s energy usage. During the 1980s Eskom mothballed three of their coal-fired power stations, as there was an excess of generation capacity at the time. With the demise of Apartheid in the 1990s came massive investment and economic growth. At the same time the government tried to deregulate the electricity supply industry by inviting the private sector to build new power stations to meet the rapidly growing demand for electricity. Eskom was at the time prevented from building new power stations (including de-mothballing the three existing power stations) or from strengthening the transmission network. The transmission network is especially important in delivering power from Mpumalanga, where the majority of the power stations are located, to other parts of the country such as KwaZulu-Natal and the Western Cape. With no bidders coming forward to construct new power stations, there was effectively no investment into new generation plants during the early 1990s, which eventually led to the shortage of capacity that was experienced in the 2000s.

In 1998, the Department of Minerals and Energy released a detailed energy review in which it explicitly warned that unless “timely steps were taken to ensure that demand does not exceed available supply capacity”, generating capacity would reach its limit by 2007.[15]

Country-wide blackouts 2007–2008

With the freeze on any new developments being placed on Eskom during the early 1990s, South Africa was faced with a situation where for the next few years the electricity demand kept rising, without any new power stations being built to keep up the necessary supply. By October 2007 the situation had deteriorated to such an extent that Eskom implemented rolling blackouts throughout the country. Blackouts occurred in most suburbs throughout the country for a period of two hours at a time.

The situation came to a head on 24 January 2008 when the national grid was brought to near collapse. Multiple trips at a number of different power stations rapidly reduced the available supply, resulting in Eskom declaring force majeure[16] and instructing its largest industrial customers (mainly gold and platinum mining companies) to shut down their operations and reduce consumption to “minimal levels”, just sufficient to evacuate workers that were still in the mines.[17]

In January 2008, with no short- or medium-term relief available to ease the power shortages, Eskom warned the public that the country’s electricity demand would exceed the supply until 2013 (when the first new power stations would be brought online).

Eskom also began recommissioning older power stations which had been mothballed in earlier decades.[18]

Country-wide blackouts 2014-2015

Load shedding was reintroduced in early November 2014. The Majuba power plant lost its capacity to generate power after a collapse of one of its coal storage silos on 1 November 2014. The Majuba power plant delivered approximately 10% of the country’s entire capacity and the collapse halted the delivery of coal to the plant.[19] A second silo developed a major crack on 20 November causing the shut down of the plant again. This was after temporary measures were instated to deliver coal to the plant.[20]

On 5 December, Eskom launched a major stage three load shedding in South Africa after the shut down of two power plants on Thursday 4 November 2014 due to diesel shortages. It was also reported that the Palmiet and Drakenburg stations were also experiencing difficulties due to a depletion of water reserve to the Hydro plants.[21] On Thursday 4 November, Eskom fell 4,000MW short of the electricity countries demand of 28,000MW. The power utility has the ability to produce 45,583MW, but could only supply 24,000MW due to “planned and unplanned” maintenance. One turbine at Eskom’s Duvha Power Station is also currently out of commission due to an “unexplained incident” in March 2014.[22]


In January 2008 Tajikistan faced its coldest winter in 50 years, and the country’s energy grid began to fail. By February 2008 Tajikstan’s energy grid was near collapse and there were blackouts in most of the country. Hospitals throughout the country were on limited electricity use, and nurses and doctors were forced to keep newborn babies warm with hot water bottles. There were reports of newborns freezing to death. The UN reported that with so much energy required to keep warm there was a danger of people starving to death.[23][24]


Lack of coal for Ukraine’s coal-fired power stations due to the War in Donbass and a shut down one of the six reactors of the Zaporizhia Nuclear Power Plant lead to rolling blackouts throughout Ukraine from early till late December 2014.[25]

United States


In February 2011, North and Central Texas experienced rolling blackouts due to 50 power plants tripping offline.[26] Temperatures ranged between 8 °F and 19 °F, the coldest in 15 years. The time of the power outages ranged from twenty minutes to over eight hours. Areas affected included Bell, Bexar, Brazos, Collin, Comal, Dallas, Delta, Denton, El Paso, Fort Bend, Guadalupe, Harris, Hays, Hill, Hidalgo, Hunt, McLennan, Montgomery, Navarro, Palacios, Smith, Tarrant, Travis, Webb and Williamson counties, as well as some counties in New Mexico, including Doña Ana, Otero, and Eddy Counties.[27]

The 2006 and 2011 blackouts were the only two to occur in two decades.[28]


Though the term did not enter popular use in the U.S. until the California electricity crisis of the early 2000s, outages had indeed occurred previously. The outages were almost always triggered by unusually hot temperatures during the summer, which causes a surge in demand due to heavy use of air conditioning. However, in 2004, taped conversations of Enron traders became public, showing that traders were purposely manipulating the supply of electricity to raise energy prices.[29]

On 13 December 2003, shortly before leaving office, Governor Gray Davis officially brought the energy crisis to an end by issuing a proclamation ending the state of emergency he declared on 17 January 2001. The state of emergency allowed the state to buy electricity for the financially strapped utility companies. The emergency authority allowed Davis to order the California Energy Commission to streamline the application process for new power plants. During that time, California issued licenses to 38 new power plants, amounting to the addition of 14,365 megawatts of electricity production when completed.


  1. Jump up to:a b “Newfoundland outages worsen amid sudden ‘generation problems'”. January 5, 2014.
  2. Jump up to:a b Gerein, Keith (9 July 2012). “Rolling electricity blackouts strike Edmonton and across the province”The Vancouver Sun. Archived from the original on 18 July 2012.
  3. Jump up^ “Preventing summer blackouts in Egypt is ‘impossible’: Minister”.Daily Egypt News. April 13, 2014.
  4. Jump up^ “Egypt to see blackouts for three years at least: Experts”Ahram Online. June 12, 2013.
  5. Jump up^http://www.ghanaweb.com/GhanaHomePage/NewsArchive/artikel.php?ID=344788
  6. Jump up^ “Electricity and power shortage holding India back”. Free-press-release.com.
  7. Jump up^ Range, Jackie (28 October 2008). “India Faulted for Failure to Improve Power Supply”The Wall Street Journal.
  8. Jump up^ [1][dead link]
  9. Jump up^ “Serving Mangaloreans Around The World!”. Mangalorean.Com.
  10. Jump up^ [2] – Tokyo Electric Power Company
  11. Jump up^ [3] – nikkansports.com
  12. Jump up^ “India offers Pakistan electricity to curb load-shedding”The Express Tribune.
  13. Jump up^ “Unscheduled loadshedding irks people in Punjab”The Nation. 2 October 2011.
  14. Jump up^ “Another day of outrage at outages across Punjab”Dawn (Karachi, Pakistan). 18 June 2012. Archived from the original on 18 June 2012. Retrieved 18 June 2012.
  15. Jump up^ “Mail and Guardian – Govt chose guns over power stations”. Mg.co.za.
  16. Jump up^ “Eskom declares force majeure”Moneyweb. 25 January 2008. Retrieved 12 February 2009.[dead link]
  17. Jump up^ McGreal, Chris (26 January 2008). “Gold mines shut as South Africa forced to ration power supply”The Guardian (London). Retrieved12 February 2009.
  18. Jump up^ Old Eskom power stations revived, Fin 24, 2 February 2011
  19. Jump up^ “http://citizen.co.za/269093/video-majuba-power-station-seconds-silo-collapse/”The citizen. 4 November 2014. Retrieved 6 December2014.
  20. Jump up^ “Eskom admits another coal-storage silo at Majuba is cracked”.Business day live. 21 November 2014. Retrieved 6 December 2014.
  21. Jump up^ “Tripped coal stations add to load shedding burden”Business day live. 5 December 2014. Retrieved 6 December 2014.
  22. Jump up^ “This is a catastrophe: electricity expert”Moneyweb. 6 December 2014. Retrieved 6 December 2014.
  23. Jump up^ Farangis Najibullah (13 January 2008). “Tajikistan: Energy shortages, extreme cold create crisis situation”EurasiaNet. Retrieved2008-02-08.
  24. Jump up^ Situation Report No. 4 – Tajikistan – Cold Wave/C

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