Japan's Tokyo Electric Power Company (TEPCO) has restarted Unit 6 of the Kashiwazaki-Kariwa nuclear power plant, following a 14-year shutdown following the 2011 Fukushima disaster. The 1,360 MW reactor is the first unit to come online since the nuclear accident that saw Japan halt operations at all its nuclear plants pending regulatory changes. The accident was caused by the 9.1-magnitude T?hoku earthquake - the third-largest in the world since 1900 - that triggered a tsunami, resulting in electrical grid failure and damage to nearly all…