A power loss affecting many [[electricity]] consumers over a large geographical area for a significant period of time.<ref>http://www.energy.ca.gov/glossary/glossary-b.html#b</ref>
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A '''blackout''' is a power loss affecting many [[electricity]] consumers over a large geographical area for a significant period of time.<ref>http://www.energy.ca.gov/glossary/glossary-b.html#b</ref>