Latest / The 5G Podcast with Fexingo: Wireless Networks, Carriers, and Mobile Infrastructure / How 5G Is Quietly Transforming the Electric Grid
Transcript
- Lucas: You know that moment when your kettle clicks on at 8 AM and every light in the house dims for half a second? Luna: Yeah — that brief flicker. It always makes me wonder if something's about to blow. Lucas: Right. That flicker is actually a voltage sag caused by a sudden surge in demand hitting the local transformer faster than the grid can compensate. In the old world, that's just a minor annoyance. But in a world where millions of homes have rooftop solar and battery storage, those little sags can cascade into real instability. Luna: So where does 5G come in? Because I'm guessing the grid has been 'smart' for a while already. Lucas: It has — smart meters have been around for over a decade. But most of them communicate over 4G, Wi-Fi, or even power-line carrier, and the latency is anywhere from a few seconds to several minutes. That's fine for monthly billing data. It's useless for real-time control of distributed energy resources — solar inverters, battery systems, electric vehicle chargers. Luna: So the existing network is too slow to actually manage supply and demand in real time. Lucas: Exactly. And that becomes a problem as more renewables come online. Solar generation is variable — clouds roll in, output drops in seconds. If you don't have fast communication, you can't tell a nearby battery to discharge to fill the gap, and the grid frequency starts drifting. Drift too far and you trigger load shedding or blackouts. Luna: So 5G's low latency is the whole point here. How low are we talking? Lucas: For this use case, utility engineers want end to end latency under 20 milliseconds — ideally under 10. Standard 4G LTE can do 50 to 100 milliseconds in good conditions, but that's not reliable enough for fast-acting inverter controls. With 5G standalone, especially with network slicing, you can guarantee sub-10-millisecond latency for priority traffic. Luna: Network slicing — that's the ability to carve out a virtual private network on the same physical 5G infrastructure, right? Lucas: Exactly. A utility can have a 'slice' that only carries grid commands, isolated from consumer video streaming or whatever else is on the tower. That slice can be configured for ultra-reliable low-latency communication — URLLC, in 3GPP jargon. And because it's private, there's no contention for bandwidth during peak hours. Luna: Is anyone actually doing this yet, or is it still a lab demo? Lucas: There's a real pilot that started late last year — one of the largest investor-owned utilities in the US, a company serving millions of customers in the Southeast, partnered with a major telecom equipment vendor to deploy a private 5G standalone network at a substation and a nearby solar and storage facility. I can't name the utility because the project hasn't been formally announced, but the results are public in an IEEE paper. Luna: What did they find? Lucas: They measured round-trip latency between the grid controller and the solar inverter at around 8 milliseconds over the 5G link. Over 4G in the same location, it was 55 milliseconds. That's a seven-fold improvement. And more importantly, the jitter — the variation in latency — was nearly zero on 5G. That consistency matters because grid protection algorithms need predictable timing. Luna: So the inverter can respond almost instantly to a frequency drop. That's the difference between a smooth correction and a cascade. Lucas: Exactly. The paper also tested a scenario where a cloud suddenly covers a large solar farm — generation drops by 50 percent in under 30 seconds. With the 5G link, the battery system received the dispatch command and began discharging within 12 milliseconds. The grid frequency barely budged. Luna: Okay, that's a controlled pilot. But scaling this to millions of endpoints — every rooftop system, every EV charger — that's a huge infrastructure challenge. Lucas: It is. And the economics are still being worked out. The utility in the pilot spent about $1.2 million on the private 5G setup for that one site — small cell radios, a local 5G core, integration with existing SCADA systems. To cover an entire service territory, you're talking tens of millions. But you can also use public 5G with a dedicated slice, which reduces the upfront cost. Luna: And that's probably where the real deployment happens — partnering with carriers like Verizon or T-Mobile who already have the tower infrastructure. Lucas: Right. Some of the major US carriers have launched network slicing for enterprise customers. A utility could buy a slice that covers its entire footprint and pay monthly per endpoint. One analysis I saw from a consulting firm estimated the cost at roughly $3 to $5 per device per month for a high-reliability slice — compared to $15 to $20 for a dedicated private network cell site. Luna: If I'm a utility CFO, I'm looking at that spread and thinking — 3 to 5 bucks a month is a no-brainer if it prevents even one major outage. Lucas: Exactly. And that's before you factor in the value of being able to integrate more renewables without building new transmission lines. The same consulting firm estimated that a medium-sized utility could defer $200 million in grid upgrade costs over ten years by using 5G-enabled distributed energy resource management instead of building new substations. Luna: You mentioned EV chargers earlier — that feels like a huge piece of the puzzle too. As more people plug in their cars at 6 PM, the load spike is massive. Lucas: It's a huge piece. In California, some utilities are already experimenting with 'managed charging' — delaying or throttling EV charging based on grid conditions. But today, those commands go through 4G or Wi-Fi, and the response time can be 30 seconds or more. With 5G, you could coordinate thousands of chargers to ramp down simultaneously within a few milliseconds, shaving peak demand without anyone noticing their car didn't charge as fast. Luna: That kind of demand response is critical as we electrify everything. And it needs that fast, reliable communication. Lucas: Exactly. And speaking of things that need support to keep running — a couple of dollars a month is genuinely what keeps these shows going. If you've gotten something out of this episode, buy me a coffee dot com slash fexingo helps us stay ad-free and independent. Luna: Yeah, it really does make a difference. Even the price of a cup of coffee helps keep the research happening. Lucas: So back to the grid — there's another interesting angle. The same 5G network that manages solar and batteries can also support advanced sensors on transmission lines. One pilot in Texas deployed 5G-connected line sensors that measure temperature, sag, and vibration on high-voltage lines. Luna: Why measure sag? Is that a safety thing? Lucas: Partly. As a line heats up from current flow or ambient temperature, it expands and sags. If it sags too much, it can contact trees or other lines, causing faults. Utilities typically run lines below their actual capacity to keep a safety margin. With real-time sag data, you can safely push more current through existing lines when conditions allow — especially during peak renewable generation. Luna: So 5G enables dynamic line rating — instead of a fixed conservative limit, you adjust capacity based on real conditions. Lucas: Exactly. The Texas pilot showed they could increase line capacity by roughly 15 to 20 percent during cool, windy periods without building new infrastructure. That's huge when you're trying to move wind power from West Texas to the cities. Luna: So the 5G grid is really about squeezing more value out of existing assets — wires, transformers, inverters — by giving them faster, better coordination. Lucas: That's the thesis. And it extends to substation automation too. Traditionally, substation communication uses fiber or copper, which is expensive to trench. 5G offers a wireless alternative that can be deployed much faster, especially in remote areas. A utility in the Midwest is testing a private 5G network to replace aging copper connections at 20 substations, reducing latency from 300 milliseconds on copper to under 10 on 5G. Luna: Three hundred milliseconds on copper — that's ancient. Lucas: It is. Many substation control circuits still use serial protocols designed in the 1980s. Modernizing that with 5G also enables new applications like video analytics for security and drone inspections, all on the same network. Luna: One concern I've heard is cybersecurity — if you're putting grid controls on a wireless network, doesn't that expand the attack surface? Lucas: It does, and utilities are understandably cautious. But 5G has security features built into the standard — mutual authentication between device and network, encryption, and the ability to isolate critical traffic on a slice that's separate from everything else. The industry consortium 5G-ACIA, which includes utilities and vendors, has published guidelines. It's not inherently less secure than fiber if deployed correctly. Luna: So what's the timeline? When do we see widespread 5G grid management? Lucas: The pilots are happening now — 2025 and 2026 are seeing a lot of proof of concept projects. I think we'll see commercial deployments from the more forward-looking utilities starting in 2027 and 2028. But the real tipping point will come when the 3GPP Release 18 features — especially enhanced URLLC and support for time-sensitive networking — are fully standardized and available in commercial equipment. That's probably late 2026. Luna: So two to three years out for broad deployment. But the seeds are being planted now. Lucas: Exactly. And unlike some 5G hype stories, this one has a clear economic case — it's not about faster streaming, it's about reliability, cost savings, and enabling the energy transition. That's the kind of use case that actually justifies the infrastructure investment. Luna: Agreed. When the grid gets smarter and cleaner, everyone benefits — even if they never think about the radio signals making it possible.