• A heat wave in Texas, responsible for Tuesday’s energy peak record, created an immediate demand for energy from NRG Energy Inc.
• The Unit 1 turbine at NRG’s Limestone coal-fired power plant tripped, the company told regulators in a filing.
• According to NRG, Unit 1 has undergone maintenance and is back on line.

From the article:

NRG Energy Inc's 831-megawatt (MW) Unit 1 at the Limestone coal-fired power plant in Texas was online and increasing output on Wednesday to meet rising afternoon power demand, according to sources familiar with the plant's operation. …