--Clyde Russell is a Reuters columnist.
BEIJING, May 4 (Reuters) - China has appointed new chairmen for the country's top three energy groups, according to company statements on Monday, in a top-down reshuffle of the industry which faces the challenges of spending cuts, low oil prices and easing demand.
WASHINGTON, May 4 (Reuters) - Former U.S.
May 4 (Reuters) - Diamond Offshore Drilling Inc, one of the world's top five offshore rig contractors, said it was scrapping three rigs in the face of weak demand due to a steep fall in global crude prices.
ANKARA, May 4 (Reuters) - A U.S. delegation will visit Iran to review energy investment opportunities while Tehran negotiates a final deal with world powers on its nuclear programme, a senior oil ministry official told Mehr news agency on Monday.
LOS ANGELES, May 4 (Reuters) - Tesla Motors Inc's plan to generate new revenue by repackaging electric car batteries as home and business power storage systems faces stiff competition for both customers and the government subsidies that are critical to the market's growth.
LONDON, May 4 (Reuters) - Oil rose towards $67 a barrel on Monday to reach a 2015 high, supported by expectations the supply glut will ease and after weak Chinese factory activity reinforced views that stimulus measures would be rolled out.
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