The Texas oil refinery that Petroleos Mexicanos is buying has racked up a rare net loss of about $360 million this year, adding to the challenges Mexico faces in seeking energy independence. Mexico’s state-owned oil giant agreed in May to buy Royal Dutch Shell Plc’s majority stake in the Deer Park refinery. The facility’s forced shutdown during the Texas freeze in mid-February led it to post the losses through July, according to people with knowledge of the situation. Deer Park has also struggled with market volatility during the pandemic, and its debt has soared past $1 billion in recent months, said the people, who asked not to be named because they weren’t authorized to speak to the media. Pemex didn’t respond to a request for […]