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"Coal-fired plants have been hit by high coal prices, overcapacity and competition, while renewable energy and nuclear power will continue to grow, supported by government initiatives," said Ivy Poon, a Moody's senior analyst.

"Columbia Gas is investigating what happened on its system today," NiSource spokesman Ken Stammen said.

"Companies are now scrambling to build infrastructure projects in countries and regions involved in the Belt and Road Initiative, which makes project engineering and trade industries that command the second and fourth biggest demand for talents," Chang added.

"China values Egypt's influence, and is willing to boost coordination and cooperation with Egypt on international and regional issues," Chen said.

"China's music instrument market is leaving the low-threshold competition, and it's hard for companies without competent technologies to sustain," he said.