An ash dike <a href="https://en.wikipedia.org/wiki/Kingston_Fossil_Plant_coal_fly_ash_slurry_spill" id="mwAbc" rel="mw:WikiLink" title="Kingston Fossil Plant coal fly ash slurry spill">ruptured</a> at a solid waste containment area for a <a href="https://en.wikipedia.org/wiki/Tennessee_Valley_Authority" id="mwAbg" rel="mw:WikiLink" title="Tennessee Valley Authority">Tennessee Valley Authority</a> <a href="https://en.wikipedia.org/wiki/Kingston_Fossil_Plant" id="mwAbk" rel="mw:WikiLink" title="Kingston Fossil Plant">coal-fired power plant</a> in <a href="https://en.wikipedia.org/wiki/Roane_County,_Tennessee" id="mwAbo" rel="mw:WikiLink" title="Roane County, Tennessee">Roane County, Tennessee</a>, releasing <span about="#mwt195" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"1.1"},"2":{"wt":"e9USgal"},"3":{"wt":"e6m3"},"order":{"wt":"flip"},"abbr":{"wt":"unit"}},"i":0}}]}' id="mwAbs" typeof="mw:Transclusion">4.2</span><span about="#mwt195" typeof="mw:Entity"> </span><span about="#mwt195">million</span><span about="#mwt195" typeof="mw:Entity"> </span><span about="#mwt195">m</span><sup about="#mwt195">3</sup><span about="#mwt195"> (1.1</span><span about="#mwt195" typeof="mw:Entity"> </span><span about="#mwt195">billion</span><span about="#mwt195" typeof="mw:Entity"> </span><span about="#mwt195">US</span><span about="#mwt195" typeof="mw:Entity"> </span><span about="#mwt195">gal)</span> of <a href="https://en.wikipedia.org/wiki/Coal" id="mwAbw" rel="mw:WikiLink" title="Coal">coal</a> <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Fly_ash" id="mwAb0" rel="mw:WikiLink" title="Fly ash">fly ash</a> <a href="https://en.wikipedia.org/wiki/Slurry" id="mwAb4" rel="mw:WikiLink" title="Slurry">slurry</a> in the largest industrial spill in U.S. history.<sup about="#mwt199" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":"natgeo19"},"body":{"id":"mw-reference-text-cite_note-natgeo19-36"}}' id="cite_ref-natgeo19_36-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./December_22#cite_note-natgeo19-36" id="mwAb8" style="counter-reset: mw-Ref 36;"><span class="mw-reflink-text" id="mwAcA">[36]</span></a></sup>