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Grid Conditions

Update: Wednesday, September 15, 0830 EST

MISO has terminated the Severe Weather Alert for South Region area(s) impacted by Tropical Storm Nicholas. 

Monday, 13 September

MISO Operations issued a Severe Weather Alert for South Region area(s) impacted by Tropical Storm Nicholas. The alert has been issued through 09/15/2021 22:00 EST. The following conditions are expected: Heavy Rain, Storm Surge, and Flooding due to Tropical Storm Nicholas. Rainfall of up to 15  inches is expected along the coastal areas. For more information, go to Notifications.

Glossary of Terms

Severe Weather Alert:

The Severe Weather Alert provides situational awareness for MISO members as the Regional Transmission Operator works to ensure all necessary resources are available to meet energy demands Additional information can be found in MISO's Conservative System Operations procedure.

Capacity Advisory:

The MISO Capacity Advisory is a communication tool used for situational awareness. The message informs MISO members that, based on projected system conditions and capacity levels, there may be a need in the coming days to bring additional units on-line. Members are instructed to prepare for this possibility.

Conservative Operations:

When declaring Conservative Operations the goal is to maximize MISO's ability to operate the Bulk Electric System during periods of extreme weather conditions and other abnormal circumstances. This declaration provides an early indication that system conditions may require emergency procedures or conservative operations.

Max Gen Alert:

The Maximum Generation Alert is used to communicate system conditions for operational awareness. The declaration informs MISO members that system conditions may require the use of MISO’s generation emergency procedures. 

Previous Events

Hurricane Ida

Update: Saturday 09/11/21 

Conservative Operations has been terminated in for the last remaining section of the South Region impacted by Hurricane Ida. This ends all of the emergency declarations stemming from the storm. Ida related restoration information can be found on our member's web and social media related platforms. 

Wednesday 09/04/21 0700 EST

MISO operations has narrowed the area in Louisiana that remains under Conservative Operations. As of 1800 EST Tuesday, Southeast Louisiana is the only Ida impacted area operating under Conservative Operations through 2359 EST on 09/10/202. For more detailed information, go to the notifications page of the MISO website.

Restoration efforts continue in the impacted area. Progress updates can be found on member web and social media platforms.

  • CLECO – The Storm Center includes outage information and restoration updates. 
  • Entergy – The company has established a Hurricane Ida page on their website in addition to their existing Storm Center includes news releases and links to the individual operating companies’ websites for more specific information.

Tuesday 09/07/21 0800 EST

Conservative Operations in the area impacted by Hurricane Ida remains in effect until 09/07/2021 23:59 EST. For details, go to the notifications page of the MISO website.

Restoration efforts continue in the impacted area. Progress updates can be found on member web and social media platforms.

  • CLECO – The Storm Center includes outage information and restoration updates. 
  • Entergy – The company has established a Hurricane Ida page on their website in addition to their existing Storm Center includes news releases and links to the individual operating companies’ websites for more specific information.

Friday 09/03/21 15:45 EST

MISO operators continue their role coordinating and assisting in implementing restoration that impacts the bulk electric grid. Members report power has been restored to approximately 20% of the 1.1 million customers impacted by Ida. Details of the progress can be found on member web and social media platforms. 

  • CLECO – The Storm Center includes outage information and restoration updates. 
  • Entergy – The company has established a Hurricane Ida page on their website in addition to their existing Storm Center includes news releases and links to the individual operating companies’ websites for more specific information. The company has also shared damage photos.

 

Thursday, 09/02/2021 17:25 EST

MISO Operations has modified the boundary of Conservative Operations to only include the Hurricane Ida affected portions of the South Region. This declaration will remain in effect until 09/07/2021 23:59 EST. For details, go to the notifications page of the MISO website.

Thursday, 09/02/2021, 08:15 EST

The MISO issued Conservative Operations declaration for the South Region remains in effect until 23:59 EST today. The MISO control room shift manager will determine if grid conditions and restoration efforts warrant extending this declaration.

Members are reporting substantial restoration progress in Louisiana and Mississippi. Details of the progress can be found on their web and social media platforms. MISO operators continue their role coordinating and assisting in implementing restoration that impacts the bulk electric grid. 

  • CLECO – The Storm Center includes outage information and restoration updates. 
  • Entergy – The company has established a Hurricane Ida page on their website in addition to their existing Storm Center includes news releases and links to the individual operating companies’ websites for more specific information. The company has also shared damage photos.

Tuesday 08/31/2021, 15:25 EST 

According to our members, more than 1 million customers in the MISO south region are without power due to Hurricane Ida’s catastrophic winds and rain. MISO members have reported that more than 2,000 miles of transmission lines are out of service in Louisiana, including all eight of the major transmission lines that service New Orleans. MISO recommends visiting the following member utility websites for the most current information on damage assessments and restoration:

  • CLECO – The Storm Center includes outage information and restoration updates. 
  • Entergy – The company has established a Hurricane Ida page on their website in addition to their existing Storm Center includes news releases and links to the individual operating companies’ websites for more specific information. The company has also shared damage photos.

MISO Transmission Owners in the impacted area will continue damage assessments over the next few days. Those assessments are necessary to create a restoration plan and that identifies which generators to start as well as the transmission paths that will move the power to areas in need. MISO operators and engineers partner with our members to study the feasibility of the restoration plan before implementation. Some of these efforts take place as part of a parallel process to safely expedite restoration.  

Tuesday 08/31/2021

The National Weather Service downgraded Ida to a Tropical Depression. The storm has moved out of the MISO region and MISO Operations has terminated the severe weather alert for our South Region.

MISO continues coordinating with impacted members to understand the full impact of Ida on the grid. Members are in the process of assessing the damage to their generators and transmission lines. This information is then shared with MISO operations. Once damage assessments are completed, restoration plans can be formalized and implemented. 

MISO continues to take the necessary measures to ensure grid and market operating systems remain secure and reliable.

The following advisory remains in effect for the South Region:

  • Conservative Operations until 23:59 EST, Thursday 09/02/2021

 

NOAA IDA Trajectory

Restoration Information

MISO, as a Regional Transmission Organization, has a specific role to play, and specific "tools" it may rely upon, when it comes to power restoration. 

Power Restoration Role and Responsibilities

MISO’s primary role during a power grid restoration in its region is to serve as a facilitator during the restoration process: coordinating, exchanging information, and maintaining stability.

MISO is responsible for the collection and exchange of information, as well as communication and coordination with the impacted entities.  Additionally, MISO is responsible for working with our impacted members to coordinate getting the power flowing again across the grid while maintaining stability so as to prevent a re-collapse of the system.

MISO also coordinates with its neighbors to ensure stability throughout the restoration process.

Restoration "Tools" or Procedures

MISO operators can rely on a number of emergency procedures to ensure grid stability and reliability during restoration. These "tools" can include sending emergency notifications and declarations to member operators in the MISO region. Some of the notification and declarations that could be issued include:

  • Transmission Advisory
    • This communication tool is used for situational awareness. The message informs members that, based on projected system conditions, there may a transmission issue that will require specific actions to be taken in order to ensure reliability.
  • Local Transmission Emergency
    • This declaration identifies a specific entity or entities and provides instructions for mitigating a transmission emergency for a specific area of the grid
  • Transmission System Emergency
    • This declaration provides instructions for mitigating operating emergencies on the Transmission System that have the potential to exceed a pre-defined system operating limit that could lead to instability or outages.

Preparing for Storms and Events

Protecting the grid and ensuring the lights stay on for the 42 million people living in the MISO region is always the top priority for MISO and its members. MISO-member operators train together multiple times each year and practice working together under simulated emergency conditions. Power system restoration is an important part of that training. Additionally, because the MISO south region is prone to hurricanes, MISO and our south region member operators conduct simulated hurricane drills each May to prepare for the upcoming hurricane season.