Power-sector cyber incidents can disrupt electricity service, and government advisories document state-sponsored campaigns against energy organizations—including a threat aimed at industrial safety systems. But those records do not show how many plants are compromised today, and the well-known 2015 Ukraine outage affected distribution companies, not generating plants. For operators, the practical response is layered defense paired with plans to keep critical functions safe and operating if systems must be isolated.
What do the documented attacks show about the risk to power plants?
On March 24, 2022, CISA, the FBI and the Department of Energy (DOE) published a joint advisory describing multiple Russian state-sponsored cyber campaigns against U.S. and international Energy Sector organizations. The advisory’s reported activity spans 2011 to 2018 and maps observed tactics and techniques to MITRE ATT&CK for Enterprise and ATT&CK for ICS. The agencies said the operations continued to pose a threat at the time of publication. That is a historical assessment in a 2022 advisory, not a measure of attack frequency or a fresh assessment of power plants in 2026.
The advisory also describes TRITON, malware designed to target Schneider Electric Triconex Tricon safety systems and capable of disrupting those systems. This is evidence of a threat to a particular type of industrial safety system; it does not establish that all plant control systems, or all plants, were compromised. The advisory says Schneider Electric issued a patch to mitigate the malware’s attack vector. Operators considering action on a specific system should check current vendor advisories and patch status, then assess changes through their site’s operational and safety processes.
How the documented events differ
| Event | What the cited advisory says | What it does—and does not—establish |
|---|---|---|
| Russian campaigns described in the CISA, FBI and DOE advisory, published March 24, 2022 | Multiple campaigns against Energy Sector organizations, with activity reported from 2011 to 2018. | Documents historical state-sponsored activity affecting the sector; it is not a current prevalence estimate or proof of compromise at a particular plant. |
| Ukraine cyberattack in December 2015, recounted in a separate 2022 CISA, FBI and NSA advisory | Russian state-sponsored activity against energy distribution companies resulted in unplanned power outages at multiple companies. | Shows that cyber operations can disrupt electricity service. It is not accurately described as an attack on a generating plant, nor does it establish the impact of an identical attack path at every facility. |
Together, these cases show why power-sector security has to address both operational technology (OT)—the systems used to monitor or control industrial processes—and the people, networks and services that support it. They do not support a claim that hackers can reliably shut down any power plant on demand.
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How should a plant build defenses around its control systems?
The CISA, FBI and DOE energy-sector advisory recommends layered measures. No single control guarantees that an intrusion will be prevented; the aim is to make access harder, limit how far an incident can spread, improve detection and preserve safe operations.
Separate enterprise IT from ICS and OT
Use robust separation between business networks and industrial control systems (ICS). The advisory recommends layered ICS network architecture, demilitarized zones (DMZs) and, where feasible, one-way communication diodes. Define boundaries around operational functions and safety needs rather than treating the plant as one undifferentiated network. Segmentation can restrict pathways and contain some activity, but it is not a guarantee against intrusion.
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Control remote and privileged access
- Require multifactor authentication (MFA) for access, including remote pathways, in line with CISA’s critical-infrastructure guidance calling for MFA for all users.
- Limit remote-access software and services to what is needed, manage privileged accounts tightly and monitor access pathways.
- Account for operational and safety constraints when implementing access controls so a security change does not interfere with safe work or required response.
Know what is connected and manage changes carefully
Maintain an inventory of hardware, software and supporting infrastructure. Use it to understand what a proposed change affects and to prioritize risk. Assess patches, test them outside production before implementation, and plan deployment through the facility’s operational processes. The advisory also recommends replacing end-of-life equipment and disabling unused services; check operational effects before making either change.
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Collect logs that can support detection
Keep robust logs on critical ICS support systems and aggregate them for review. The advisory recommends security incident and event monitoring to correlate activity across ICS networks. Logging is useful only if the organization can review it and investigate relevant events, so detection arrangements should be part of the operating plan rather than an afterthought.
Protect the places and people that support ICS
Physical security matters alongside network controls. The energy-sector advisory recommends protecting spaces that house ICS equipment and addressing staffing coverage and response roles through preparedness planning. A control-room or technical response plan should make clear who is responsible for decisions and how coverage is maintained during an incident.
How can operators keep critical functions running during an incident?
Cybersecurity planning should include continuity, not just prevention and containment. A separate 2022 CISA, FBI and NSA advisory recommends preparing and exercising incident-response, resilience and continuity plans. It also emphasizes understanding IT/OT dependencies and identifying workarounds so critical functions can continue if networks need to be isolated.
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- Map dependencies: Identify which business systems, network connections, support services and people are needed for critical operational functions.
- Define isolation choices: Decide in advance how affected systems or pathways could be isolated and what operational effects that could have.
- Preserve workarounds: Document and exercise manual controls or other approved procedures for maintaining critical functions when digital systems are unavailable.
- Exercise realistic scenarios: Include the teams responsible for operations, safety, IT, OT and incident response, and test how they coordinate under the site’s procedures.
Manual operation is not a universal fallback: its availability and safe use depend on the facility. The point of exercising it is to establish what the plant can actually do, who is authorized to act and what conditions require a different response.
What should a utility do if it suspects OT systems are compromised?
The 2022 CISA, FBI and NSA advisory recommends isolating affected systems when responding to suspected activity, securing backups, collecting and reviewing logs and artifacts, and reporting incidents to the named authorities. At a plant, containment actions must be coordinated with operational and safety responsibilities; do not treat network isolation as a purely technical step that can be taken without considering process impacts.
- Follow the site incident plan. Notify the designated operations, safety, IT/OT and incident-response leads. Use established decision authority and operating procedures.
- Assess and contain with operational impact in view. Identify affected systems and pathways, then isolate affected systems as appropriate under the response plan. Coordinate the action with the teams responsible for safe operation.
- Preserve evidence. Secure backups and collect and review relevant logs and artifacts in accordance with the response plan.
- Maintain continuity and recover deliberately. Use exercised workarounds where appropriate, and make recovery decisions through the site’s established operational and safety processes.
- Report through verified channels. The advisory recommends reporting to named authorities, but reporting contacts and channels can change. Verify the current instructions for the facility’s jurisdiction and circumstances.
How does DOE’s risk guidance apply to generation facilities?
DOE’s Electricity Subsector Cybersecurity Risk Management Process was developed in collaboration with NIST and NERC, with industry and utility trade groups involved. DOE describes its intended scope as organizations involved in generation, transmission, distribution, marketing and supporting services, including vendors. The process is a guideline for starting or improving a risk-management program—not a statement that every facility has one uniform legal duty.
The DOE page says, “Cybersecurity risk, as with all risks, cannot be completely eliminated, but instead must be managed through informed decision making processes.” That framing is useful for operators: prioritization and risk decisions should be connected to enterprise risk management, while recognizing that the guidance does not promise risk can be eliminated.
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DOE also describes cybersecurity baselines and interim implementation guidance focused on electric distribution systems and distributed energy resources (DER), including asset scoping and prioritization. That distribution- and DER-focused context should not be treated as a plant-specific baseline for every generation asset. Applicable regulatory obligations depend on a facility’s jurisdiction, ownership and grid role, as well as the standards that apply to it.
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The agencies do not publish a scored comparison of products or plant-security programs in the cited materials. A practical review can instead test whether a proposal addresses the control and resilience needs in their recommendations:
Quick Recap
- Are IT/OT separation and boundaries around critical operational zones clearly defined?
- Are remote pathways and privileged accounts limited, protected with MFA and monitored?
- Are asset changes and patches prioritized by risk and tested outside production before deployment?
- Can asset inventories and centralized logs support investigation and detection?
- Have manual operation, isolation, continuity and recovery plans been exercised?
- Does the approach fit the facility’s technology, safety requirements and applicable jurisdictional obligations?
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