What Are Distributed Energy Resources, and Why the Inverter Matters
Distributed energy resources, or DER, are the small-scale generation and storage systems connected to the grid at the distribution level rather than at large central power plants. Rooftop and commercial solar arrays, battery energy storage systems, and wind installations are all DER. At the heart of most of them sits the inverter, the device that converts direct current from panels or batteries into the alternating current the grid uses, and that increasingly manages how the resource interacts with the grid.
The inverter is not a passive component. Modern smart inverters actively regulate voltage and frequency, respond to grid conditions, and communicate with utilities and cloud platforms. That intelligence is what makes DER valuable to a modern grid, and it is also what makes the inverter a security-relevant control device. An inverter that can be manipulated is a small piece of grid control infrastructure in the wrong hands.
As solar and storage deployment accelerates, the number of these internet-connected control devices has grown into the millions, and with it a new and distinctive cybersecurity challenge.
Why DER Changes the Grid Security Model
The traditional grid security model was built around a relatively small number of large, centrally managed, well-defended assets. DER inverts that model. Instead of a few hundred power plants, the grid now depends in part on millions of small devices, many of them owned by consumers and businesses rather than utilities, connected over the public internet, and manufactured by a wide range of vendors with varying security practices.
The critical concept is aggregation. A single residential inverter is insignificant to grid stability. But inverters of the same make and model, controlled through the same cloud platform or vulnerable to the same flaw, can number in the tens or hundreds of thousands. If many were manipulated simultaneously, to trip offline together or to inject or withhold power in a coordinated way, the aggregate effect could stress grid stability. Researchers studying this scenario have shown that coordinated manipulation of many small inverters is a legitimate grid-level concern, not merely a collection of minor individual risks.
Grid security implication: The risk from DER is not primarily that any one device matters, but that many identical devices can be affected together. This shifts the security question from the individual asset to the fleet and the platforms that manage it.
The DER Threat Landscape
The concerns here are not hypothetical. Security research and real incidents have made the risks concrete.
Documented Inverter Vulnerabilities
In 2025, security researchers at Forescout's Vedere Labs disclosed dozens of vulnerabilities across inverters from major manufacturers including Sungrow, Growatt, and SMA, some serious enough to allow attackers to take control of affected systems. Broader analysis has identified tens of thousands of solar devices directly exposed on the internet across dozens of vendors, and numerous vulnerabilities across many manufacturers, a significant portion of them critical. These findings paint a picture of a device category that has grown quickly, with security maturity lagging behind adoption.
Exploitation in the Wild
In 2024, a botnet was observed hijacking hundreds of internet-exposed inverters, demonstrating that these devices are not just theoretically vulnerable but are actively targeted, much like any other exposed internet-connected system.
Supply Chain and Component Integrity
In 2025, reports emerged of undocumented communication components discovered inside certain imported inverters and batteries, raising the possibility of connectivity that operators were unaware of. This concern is amplified by supply chain concentration: a large share of the world's inverters and related components originate from a small number of manufacturers, which makes the integrity of what is inside a device a strategic consideration.
Insecure Communications and Interfaces
Many fielded DER devices communicate over unencrypted interfaces, rely on weak authentication, and expose management functions that can permit remote code execution or arbitrary firmware updates. The standardized protocols that make DER interoperable, including IEEE 2030.5, SunSpec Modbus, and DNP3, also mean that a technique effective against one device may apply broadly across many.
Why Inverters Are Hard to Secure
Several factors make DER security genuinely challenging.
Ownership is fragmented. Many DER assets are owned by consumers and businesses, not by the utility whose grid they affect, which complicates who is responsible for securing them.
Devices are cost-sensitive. Inverters are consumer and commercial products built to competitive price points, and security has not always been a design priority.
Connectivity is cloud-centric. Many inverters are managed through vendor cloud platforms, which concentrates control and makes those platforms high-value targets.
The installed base is vast and long-lived. Millions of devices are already deployed, many without modern security features, and they will remain in service for years.
The Standards Landscape
Standards for DER are evolving to catch up with the security reality. The foundational interconnection standard, IEEE 1547-2018, defined how DER connects to and supports the grid, but it did not mandate cybersecurity requirements at the DER interface. Work is underway to strengthen the cybersecurity provisions in the standard's ongoing revision, reflecting the recognition that interconnection and security can no longer be treated separately.
Alongside this, communication standards such as IEEE 2030.5 and SunSpec provide mechanisms for secure DER communication, and broader OT security standards including IEC 62443 apply to the systems and platforms that manage DER fleets.
Standards implication: Because the foundational interconnection standard did not originally require security, a large installed base exists that predates meaningful cybersecurity expectations. Securing DER therefore depends heavily on the controls operators and aggregators put in place around these devices, not only on the standards the devices were built to.
Defending Solar and DER
DER security requires attention at the device, the communication, and the fleet-management levels.
Secure the communication. Require encrypted, authenticated communication between inverters, aggregation platforms, and utility systems, using the secure mechanisms the modern protocols provide.
Apply product and firmware security discipline. Favor devices that support secure boot, signed firmware updates, and strong authentication, and build these requirements into procurement. The principles of firmware and product security apply directly to inverters.
Segment and control access. Where DER connects to operational networks, segment it so that a compromised device or platform cannot reach systems beyond its intended scope, and control management access tightly.
Protect the aggregation platform. Because cloud management platforms can influence large fleets at once, they warrant the strongest protection, including robust authentication, monitoring, and access control.
Monitor the fleet. Visibility into the behavior of DER assets and their management platforms allows anomalous activity, such as unexpected mass commands, to be detected.
Defensive implication: Given the fragmented ownership and vast installed base, the most effective points of control are often the communication channels and the aggregation platforms, where protection scales across many devices at once.
Common Findings
From assessment work in the renewable energy space, the recurring issues include:
- Internet-exposed inverter interfaces reachable without adequate protection.
- Unencrypted or weakly authenticated communications between devices and management platforms.
- Limited firmware and product security requirements in procurement, allowing insecure devices into deployments.
- Insufficient segmentation between DER systems and broader operational networks.
- Concentrated platform risk, where a single cloud management platform controls a large fleet without commensurate protection.
The Bottom Line
Distributed energy resources are transforming the grid, and in doing so they are creating a new security frontier defined by scale, fragmented ownership, and rapid growth. The inverter, once thought of as a simple power-conversion device, has become a networked control asset that matters, especially in aggregate. Securing DER means treating these devices and the platforms that manage them as the grid-connected control systems they are: with secure communication, product security discipline, segmentation, and fleet-level visibility.
The technology is advancing quickly, and so is the attention it draws from both researchers and attackers. Operators and aggregators who build security into their DER programs now, rather than after an incident, will be far better positioned as this part of the energy system continues to grow.
Beacon Security helps renewable energy operators and aggregators secure solar, storage, and distributed energy resources, from device and communication security to fleet monitoring and platform protection. Contact us to discuss securing your DER environment.
