DUBAI / Reuters Saudi Arabia’s central bank said it had not banned trading of the Qatari riyal since Riyadh cut diplomatic ties with Doha, and said visiting Qatari citizens could exchange their currency. Saudi Arabia, the United Arab Emirates, Bahrain and Egypt severed diplomatic and transport ties with Qatar on June 5, accusing Doha of backing terrorism, which Qatar denies. …

Bloomberg Private equity firm Energy Capital Partners and a consortium of investors struck a deal to buy US power generator Calpine Corp. for $5.6 billion in cash. Calpine investors will get $15.25 a share, the Houston-based company said in a statement, 13 percent more than the closing price. Including debt, the deal is valued at more than $17 billion. The …

Bloomberg Blackstone Group LP’s reach for $10 billion in energy assets is the firm’s latest bet that the US shale boom is just hitting its stride. The world’s largest alternative-asset manager agreed to buy Harvest Fund Advisors for an undisclosed amount, adding the firm’s 18-member team led by Eric Conklin to an investment empire that spans private equity, real estate, …