As the number of failed British electricity suppliers continues to rise, two of the world’s largest oil and gas giants are feeling the ripple effect. On Wednesday, U.K.-based energy supplier Pure Planet announced it had gone out of business after minority shareholder BP Plc terminated its gas and power supply agreement. Less than three weeks earlier, Royal Dutch Shell Plc.’s loss-making retail power business was appointed by a U.K. regulator to take on quarter of a million new customers. Unprecedented volatility in power and natural gas markets has squeezed suppliers as surging prices crush their margins, forcing ... (full story)