The significant decrease in generation has caused blackouts, many of them ordered by government.
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These blackouts are expected to continue for several weeks, agency boss Tetsuhiro Hosono said.
Blackouts were meant to encourage ticket sales, but the strict guidelines are now looking outdated.
Electricity blackouts in Venezuela's provinces doubled between 2004 and 2005, according to government statistics.
Japan already faces rolling blackouts for months due to the loss of electrical capacity.
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It kept energy tariffs frozen at their 2002 level, deterring investment and prompting blackouts last year.
Energy shortages in 2008 led to rolling blackouts, disrupting manufacturing and the country's crucial mining industry.
Congestion on lines carrying power from north to south raises the risk of blackouts.
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The downside: more blackouts loom as teams struggle to sell out their stadiums .
CALIFORNIA'S ELECTRICITY DISASTERS--RISING PRICES and blackouts--underscore a sad truth: Policymakers are making a hash of deregulation.
Sandy arrived on the US Atlantic coast on Monday night, bringing hurricane-strength winds, flooding and blackouts.
Energy-watchers now fret about possible blackouts as power stations close and are not replaced.
The latest development follows two days of sporadic blackouts across Europe, the Middle East and Africa.
It also allows utilities to pinpoint grid problems and, ideally, prevent blackouts before they happen.
The electricity blackouts in July were caused by states ignoring national limits on power use.
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But the alert lasted for only two hours and did not result in any rolling blackouts.
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We don't anticipate using that authority that would keep the lights on and prevent blackouts.
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They can cause long-lasting radiation storms in our planet's upper atmosphere and trigger radio blackouts.
Blackouts are bad not just for business but also for public health and safety.
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"I just want to get to the bottom of what's causing my blackouts, " he said.
Disputes over the fees have also led to high-profile blackouts of channels on cable and satellite lineups.
They also suggest that Gaza be linked to Egypt's electricity grid, to end the strip's daily blackouts.
California's problems were caused by Enron's suddenly inflating the price of electricity, forcing blackouts throughout the state.
In the meantime, he said, electricity would be rationed with rolling blackouts to several cities, including Tokyo.
To compensate, SanDisk and Zing have one-upped the portable satellite radios that must also deal with blackouts.
Medium-size M-class flares can cause brief radio blackouts in the polar regions and occasional minor radiation storms.
But for the time being power will remain in short supply and rationing and blackouts will continue.
In the poorer neighborhoods that happened to be mostly Shiite, blackouts and potholes were a way of life.
Reddit and other websites helped defeat the proposed bills earlier this year by staging blackouts on their websites.
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Some places in Pakistan suffer blackouts for up to 18 hours a day during the hot summer months.
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