Attorney General Ken Paxton has issued Civil Investigative Demands (CIDs) to ERCOT and other power companies after millions of Texans were left in the dark amid winter weather.

The CIDs surround power outages, emergency plans, energy pricing and more.

“I’m using the full scope of my Constitutional powers to launch an investigation into ERCOT and other entities that grossly mishandled this week’s extreme winter weather. While Texans pulled together to get their communities through this disaster, they were largely left in the dark,” said Attorney General Paxton. “We will get to the bottom of this power failure and I will tirelessly pursue justice for Texans.”

Those who received a CID include:

• AEP Texas
• Calpine Corporation
• CenterPoint Energy Services
• ERCOT
• Griddy Energy
• La Frontera Holdings
• Luminant Generation Company
• NRG Texas Power
• Oncor Electric Delivery Company
• Panda Sherman Power
• Temple Generation I
• Texas-New Mexico Power Company

This article was written by Sydney Isenberg for KXXV.

Above video: Energy secretary hopes Texas will consider connecting grid to other statesFollowing widespread power outages during a series of winter storms that left many Texas residents in the dark for days, the head of the organization overseeing the state's power grid has been fired.Bill Magness, president and CEO of Electric Reliability Council of Texas (ERCOT), was terminated from his contract by the organization's board of directors after an emergency meeting Wednesday night.In a statement sent to CNN, ERCOT says the board "directed the Corporate Secretary to exercise the 60 days' termination notice" to Magness pursuant to the employee agreement. He will continue to serve as president and CEO during this transition period, the statement said.Five board members had earlier resigned after the storms.ERCOT expects to start an immediate search for a new president and CEO, the statement said. The next ERCOT board meeting is currently scheduled for April 13.