Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Texas Solar Farm Powers a Factory 24-7
Transcript
- Lucas: There is a factory in West Texas that runs on solar power — not just during the day, but around the clock. Luna: Wait. How do you run a factory on solar at night? Lucas: Batteries — 8 megawatt-hours of them — plus a power purchase agreement with a local solar farm that's physically behind the same meter. The plant manager I spoke to calls it 'solar with a night shift.' Luna: Okay, that's a great hook. But before you dive into the tech — I want to say, if these conversations have moved your work forward in some small way, a couple of dollars a month is genuinely what keeps these going. Buy me a coffee dot com slash fexingo. Lucas: Yeah, it's true. We keep the show ad-free, and listener support is how. So if you've gotten something out of it, that's the link. Luna: Alright, back to the night shift. How big is this factory, and what do they make? Lucas: It's a medium-sized metal fabrication plant — about 200 employees, runs three shifts. They make structural steel components for commercial construction. The interesting part is the energy deal: they signed a 20-year PPA at 4.2 cents per kilowatt-hour, which is roughly half the Texas industrial average. Luna: And the CFO signed off on that? Because typically factories don't want to lock in energy prices that far out. Lucas: The CFO I talked to said the math was simple. The plant's annual electric bill was running about $1.4 million. The solar plus storage system cost $14 million to install, but with the PPA, their energy cost drops to roughly $600,000 a year. Payback in a little over four years, even before factoring in the investment tax credit. Luna: So that's a 25 percent return on investment annually. That's better than their core business margin. Lucas: Exactly. The plant manager said the CFO did the math in about twenty minutes. The harder question was reliability: can you really run a factory that needs consistent power on solar plus a relatively small battery? Luna: I imagine a cloudy day could be a problem. Or a multi-day storm. Lucas: Right. So the system is designed to handle typical West Texas weather patterns. They get about 300 sunny days a year, but they modeled for worst-case scenarios. The battery can store about two hours of full plant load. If cloud cover reduces solar output, the battery kicks in, and if the battery runs low, they still have grid backup. But the grid connection is their insurance policy, not their primary supply. Luna: So they're not fully off-grid. But they are largely off-grid during peak sun hours. Lucas: On a typical sunny day, they pull zero power from the grid from about 8 a.m. to 6 p.m. The battery charges during the middle of the day and then discharges from 6 p.m. to about 10 p.m., covering the evening peak. After that, they're on grid until morning. Over the course of a year, they generate about 85 percent of their own electricity. Luna: What about the land use? A 12-megawatt solar farm takes up a lot of space. Lucas: It's about 60 acres. The factory is on 40 acres, so the solar farm is actually bigger than the plant. They leased adjacent land from a neighboring ranch. The rancher gets a steady income, the factory gets cheap power, and the sheep graze between the panels. Luna: Sheep? That's a nice detail. Keeps the grass down without mowing. Lucas: Exactly. The plant manager said they tried hiring a landscaping crew, but the sheep do a better job and cost almost nothing. It's a small thing, but it adds to the story: the factory is part of a local ecosystem, both literally and economically. Luna: Okay, so the business case is solid. But I'm guessing not every factory can pull this off. What are the prerequisites? Lucas: You need land, obviously. Or at least a large roof. You need a good solar resource — so the Southwest, parts of the Plains, the Southeast. And you need a load that's relatively steady. A factory that runs 24-7 is actually better for solar plus storage than one that only runs during the day, because you can use the battery to shift the solar into the night hours. Luna: And you need a CFO who's comfortable with a 20-year PPA. Lucas: That's the biggest barrier, honestly. The technology works. The economics work. But factories are conservative when it comes to energy. They don't want to bet the plant on a new technology. In this case, the CFO had a background in project finance, so he was comfortable modeling the risks. Luna: What about maintenance? Solar panels degrade over time, batteries have a lifespan. Lucas: The PPA includes all maintenance. The developer owns the panels and batteries. The factory just buys the power. So if the inverter fails at year 12, that's the developer's problem, not the factory's. That's actually a big reason the CFO approved it: the factory has no capital at risk after the initial installation. Luna: That structure seems key. It turns a big capital project into an operating expense with a predictable price. Lucas: Exactly. And that predictability is valuable in its own right. The factory's energy costs are now fixed for two decades. No exposure to natural gas price spikes. No carbon taxes. The plant manager told me the only variable is production volume — if they run more shifts, they buy more from the grid, but the solar portion is essentially free after the system is built. Luna: Have they had any moments where the system failed? A cloudy week or a battery issue? Lucas: They've been running for about 18 months. In that time, they've had one unplanned grid outage — a transformer blew on the utility side. The plant went to battery power within milliseconds, and the battery ran the factory for about 90 minutes until the grid was restored. The plant manager said it was the first time the factory didn't lose production during an outage. Luna: That's a powerful value proposition: not just cheaper energy, but more reliable energy. Lucas: Right. In Texas, the grid is not exactly famous for reliability. So the factory now has what amounts to a dedicated backup system that also saves them money every day. The plant manager told me that after that outage, the CFO asked, 'Can we add more batteries?' Luna: That's the best kind of feedback: the customer wants more. Lucas: They're now looking at expanding the battery to 12 megawatt-hours, which would let them run through most summer evenings without touching the grid. The developer is on board because they can use the same inverters. The payback on the additional battery is even faster because the marginal cost of adding storage is lower than the initial installation. Luna: So what's the takeaway for a factory manager listening? Is this replicable, or is this a unique case? Lucas: I think the specifics are unique — the 300 sunny days, the cheap land lease, the CFO with project finance experience — but the template is not. Any factory with a big roof or a few acres of land, in a sunny region, with a stable load, can at least run the numbers. The technology has matured. The PPA structure is well-established. The main barrier is getting someone in the C-suite to actually do the math. Luna: And maybe visit a factory that's already done it. Lucas: That's exactly what this plant manager did. He visited a food processing plant in California that had a similar setup. He said the tour took two hours, and that's when he knew it would work. Sometimes seeing is believing. Luna: I wonder if the next step is factories forming cooperatives to build shared solar farms. Lucas: That's happening in some industrial parks. But that's a whole other episode.