HSE 614 Discussion 3: The Most Critical Infrastructure Sector Under PPD-21 (Energy)
3 min read HSE 614 Week 2 Discussion 3: The Most Critical Infrastructure Sector Under PPD-21 (Energy)
Presidential Policy Directive 21 identified 16 critical infrastructure sectors and designated a federal Sector-Specific Agency (SSA) for each. Explain which sector you believe is the most critical and justify your recommendation.
Initial post of at least 250 words; APA 7th edition citations and references; all sources must come from the course modules. Provide new thoughts and insights and scholarly writing.
Powers every other sector
Outages ripple to water, health, communications
Weather, physical and cyber attacks
PPD-21 to NSM-22
Model response
Original example for study purposes (about 320 words). Use only your course module sources in your submission.
Presidential Policy Directive 21 (PPD-21) identified 16 critical infrastructure sectors, from chemical and communications to water and wastewater systems, and assigned each a federal Sector-Specific Agency (The White House, 2013). While all are essential, I believe the Energy sector is the most critical, with the Department of Energy as its lead federal agency.
PPD-21 specifically singled out energy and communications as uniquely critical because of the enabling functions they provide across all sectors (The White House, 2013). Energy is the foundation on which nearly every other sector operates. Hospitals need electricity for life support and refrigeration of medicines; water treatment plants need power to pump and purify water; communications networks, financial systems and transportation signals all stop without it. Even communications, the other enabling sector, depends on electricity for cell towers and data centers. This makes energy a “lifeline” whose failure cascades: a prolonged outage quickly becomes a water crisis, a public health crisis and an economic crisis at the same time.
The sector also faces a broad and growing threat landscape. Severe weather, such as the February 2021 Texas winter storm, has shown how quickly grid failures can lead to loss of life. Physical attacks on substations and cyberattacks on industrial control systems and pipelines demonstrate that adversaries recognize the sector’s leverage. Because most energy infrastructure is privately owned, protecting it requires strong public-private partnership, which is central to the NIPP’s approach (U.S. Department of Homeland Security, 2013).
One new insight is that the importance of energy is increasing rather than decreasing. As vehicles, heating and industry electrify, more of society’s functions depend on the grid. In 2024, National Security Memorandum 22 replaced PPD-21 and renamed SSAs as Sector Risk Management Agencies, emphasizing cross-sector dependencies and minimum security requirements (The White House, 2024). That shift reinforces my recommendation: investment in energy resilience, including backup power for other critical sectors, offers the greatest protective return for the nation.
References
The White House. (2013, February 12). Presidential policy directive 21: Critical infrastructure security and resilience.
The White House. (2024, April 30). National security memorandum on critical infrastructure security and resilience (NSM-22).
U.S. Department of Homeland Security. (2013). NIPP 2013: Partnering for critical infrastructure security and resilience.
Tip: if your course modules do not include NSM-22, keep the point but cite the module that discusses current policy, or remove it.
Frequently asked questions
How many critical infrastructure sectors are there?
PPD-21 identified 16 sectors.
What replaced Sector-Specific Agencies?
Sector Risk Management Agencies, a term adopted by Congress and used in NSM-22 (2024), which replaced PPD-21.
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