Power line communication (PLC) has been around for decades. It’s a foundational technology for smart grids and industrial networks. Yet, despite widespread deployments, it’s still widely misunderstood.

As energy infrastructure expands to keep up with the demands of EV charging, AI data centers, and more, many outdated assumptions about PLC continue to circulate. However, they’re often based on legacy implementations or misunderstandings of modern PLC capabilities.

This article addresses common myths about PLC, clarifies the technical reality, and explains why PLC remains a reliable, scalable, and cost-effective communication layer for infrastructure networks.

1. PLC is outdated technology.

PLC continues to evolve with modern standards, improved modulation schemes, enhanced security, and hybrid networking capabilities. It remains a key component of next-generation smart grid and industrial IoT systems.

Beyond connectivity, PLC increasingly plays a role in data collection. By enabling reliable communication with distributed sensors and devices, PLC networks serve as a backbone for gathering high-quality operational data. This data is then leveraged by AI and analytics platforms for applications such as predictive maintenance, grid optimization, anomaly detection, and energy management.

2. Power lines are too noisy for reliable communication.

Power lines are inherently noisy, but modern PLC systems are specifically designed for this environment. Techniques such as orthogonal frequency-division multiplexing (OFDM) modulation, forward error correction (FEC), interleaving, and adaptive tone mapping allow PLC to maintain robust communication even under severe noise conditions.

3. PLC can disturb or affect the power supply.

PLC signals are low-power, high-frequency signals superimposed on the power line. Their power is negligible compared to the main power, and they’re not only designed to coexist with power delivery without interference, but they’re also carefully regulated to comply with EMC standards. In general, PLC signals are also filtered and coupled to avoid impacting equipment operation. If properly designed, PLC systems don’t affect power quality or supply stability.

4. PLC is slow and only suitable for low data rates.

PLC isn’t inherently slow. It’s optimized for different application requirements, from highly reliable control networks to high-speed data links. It spans a wide performance range depending on the technology:

• Narrowband PLC: From kb/s to hundreds of kb/s, optimized for reliability and range
• Mid-band PLC: Mb/s
• Broadband PLC: Hundreds of Mb/s to roughly 1 Gb/s, optimized for bandwidth

In particular, Narrowband PLC (NB-PLC) is often misunderstood as being too slow for the applications it serves. In reality, modern NB-PLC technologies (such as G3-PLC and IEEE 1901.2) can deliver hundreds of kb/s, sufficient for advanced metering, firmware updates, and real-time grid control. In infrastructure networks, reliability and determinism are more critical than peak throughput.

5. Wireless is always better than PLC.

Wireless technologies have a mobility advantage. But in systems already connected to power, wired communication provides significant advantages in reliability and security. Wireless technologies face limitations, including:

• Coverage gaps (basements, underground, dense infrastructure)
• Spectrum congestion and interference
• Dependence on external infrastructure

PLC also provides deterministic coverage, whereby any device connected to the power line can be reached. Both wireless and PLC have the benefit of “no new wires.” In many deployments, PLC and wireless are complementary rather than competing technologies.

6. Modems designed for wireless work just as well on power lines.

Power lines present a unique and challenging communication channel that’s fundamentally different from RF:

• Periodic noise synchronized with the AC cycle
• Frequency-selective attenuation and impedance variations
• Impulse noise (from switching events, motors, relays, and more)
• Harsh and rapidly changing channel conditions

Wireless modems aren’t for these characteristics. Well-designed PLC systems use specialized PHY layers tailored specifically for power line environments. This is why PLC requires purpose-built communication techniques rather than simple adaptations of wireless systems.

7. PLC is only for smart meters.

While widely used in advanced metering infrastructure (AMI), PLC is used across a wide range of applications beyond metering, including:

• Street lighting
• Industrial automation
• EV charging infrastructure
• Transportation (trains, trucks, airfield lighting)
• Renewable energy systems

NB-PLC is also sometimes perceived as suitable only for simple or low-end applications. In practice, it supports advanced capabilities such as IPv6 networking (6LoWPAN), mesh routing, and strong security, enabling deployment in large-scale, mission-critical infrastructure systems. NB-PLC is a general-purpose communication technology, suiting it for large-scale infrastructure networks.

8. PLC isn’t secure.

Modern PLC standards incorporate strong, industry-proven security mechanisms, including:

• AES-based encryption (128/256-bit)
• Authentication and secure key management
• Controlled network access and device provisioning

In addition, PLC benefits from being a wired communication medium, which provides inherent security advantages over wireless systems:

• No over-the-air exposure, reducing susceptibility to remote interception
• Physical access required to tap into the network
• Reduced risk of jamming, spoofing, or RF-based attacks

These characteristics make PLC particularly well-positioned for critical infrastructure, where reliability and security are key. When used for vehicle communication over wired buses, PLC delivers secure, deterministic communication without RF interference or external exposure. It also enables control and monitoring over existing power cables in large-scale lighting systems, ensuring high reliability, low latency, and strong protection against external interference or malicious access.

9. PLC is difficult to deploy.

PLC simplifies deployment by leveraging existing electrical infrastructure. There’s no need to dig trenches or install new cables, while wireless site surveys or spectrum planning also is avoidable.

On top of that, PLC can be deployed with minimal incremental hardware, which ultimately results in faster deployment and lower total cost.

10. PLC can’t scale.

PLC networks are designed for large-scale deployments, supporting up to millions of nodes as well as mesh and hierarchical topologies. They can also be incorporated into utility-grade network management.

11. PLC isn’t future-proof.

PLC is becoming a core component of the long-term architecture of modern grids. Modern PLC standards (e.g., G3-PLC, IEEE 1901.2) are:

• IPv6-based (6LoWPAN)
• Designed for interoperability and long lifecycles
• Continuously evolving (e.g., hybrid PLC+RF, higher performance modes)

PLC networks already support distributed energy resource (DER) integration, EV charging, and AI-driven grid analytics, making them highly relevant for future infrastructure.

Conclusion

With its reliability in harsh environments, scalability to millions of devices, and ability to reduce costs by reusing existing infrastructure, PLC has the potential to help modernize the grid and keep it ahead of the demands of vehicle electrification, renewable generation, and data centers. For EV charging and other large-scale energy systems, PLC already serves as the hidden layer of intelligence, enabling reliable communication over existing infrastructure.

Rather than competing with wireless technologies, PLC complements them. For utilities and industrial companies, the question is no longer whether PLC is viable, but how best to integrate it into a broader connectivity strategy.