The announcement released on October 24 has not been widely distributed to the media, because the drill is simulating a total grid collapse and could spark public fear.
"This exercise will begin with a national massive coronal mass ejection event which will impact the national power grid as well as all forms of traditional communication, including landline telephone, cellphone, satellite, and Internet connectivity,"
In July, we warned about the US government quietly preparing for a massive coronal mass ejection with the passage of an Executive Order - "Coordinating Efforts to Prepare the Nation for Space Weather Events".
Here is snippet of section 1 of the executive order:
Space weather events, in the form of solar flares, solar energetic particles, and geomagnetic disturbances, occur regularly, some with measurable effects on critical infrastructure systems and technologies, such as the Global Positioning System (GPS), satellite operations and communication, aviation, and the electrical power grid. Extreme space weather events — those that could significantly degrade critical infrastructure — could disable large portions of the electrical power grid, resulting in cascading failures that would affect key services such as water supply, healthcare, and transportation.