Heat warnings have been issued for the south-central and southeastern regions, as well as the Gulf Coast. The high temperatures have led to a significant increase in electricity demand, causing a sharp spike in electricity prices in Texas.
The ERCOT has reported that the state's electricity demand has broken records 10 times since June. Due to the tight power supply situation, the Public Utility Commission of Texas has authorized significant price increases in the northern region, including the third-largest city of Dallas. On August 23rd-24th, electricity prices in the region surged by over 260% in just one day. Furthermore, on August 27th, ERCOT declared a tight grid condition due to lower wind and solar power generation levels. They requested Texas residents to reduce energy usage between 4 pm and 9 pm on that day.
Enel North America has initiated five BESS projects in Texas in response to the extreme heat pushing energy demand to record levels. The total storage capacity of these projects is 369 MW/555 MWh. Two projects have a capacity of 59 MW/89 MWh each, two projects have a capacity of 57 MW/86 MWh each, and the fifth project has a capacity of 137 MW/206 MWh. All projects are located in the same area as Enel's existing renewable energy portfolio in the state and have a discharge duration of 1.5 hours.
The primary ancillary services operated by the ERCOT include Reg Up and Reg Down, Responsive Reserve Service (RRS or spinning reserve), and Non-Spinning Reserve. Reg Up and Reg Down are frequency regulation services that help maintain the grid at 60Hz by balancing fluctuations in the energy market within five-minute intervals. RRS provides capacity when generating units go offline.
On September 6th, when reserves were running low, the ERCOT declared a Level 2 Energy Emergency Alert. In response, Enel provided 524 MWh of electrical energy from its seven energy storage systems in the state. It also utilized 145 MW from its 200 MW demand response portfolio to assist Texas grid operators in balancing the grid.
Taking a closer look at the U.S. electricity market, the continental United States is roughly divided into three major grid systems: the Eastern Interconnection, the Western Interconnection, and the independent Texas grid. The Texas grid has minimal interconnections with neighboring grids, making it challenging for the energy-rich state to import electricity during extreme weather events. As a result, Texas has been a leader in energy storage capacity, with its storage systems accounting for 19% of power capacity in the state in 2022, ranking second in the nation
