I read three trade reports and one press release before writing this, and I didn't find an EPC Power datasheet in any of them. Keep that in mind. What follows is what the announcements say, plus my own judgement about what it means for someone shopping for rooftop panels. The judgement is mine; the numbers aren't.
What Did EPC Power Actually Open?
In mid-July 2026, EPC Power held a ribbon-cutting for a 167,000 square foot factory in Fountain Inn, South Carolina. Solar Power World reported it on July 15. It's the company's second site in South Carolina and its third overall, according to the Plant Services write-up.
The numbers that matter:
- Capacity at full production: 27 GW of inverters a year, scalable to 40 GW
- Effect on output: nearly triples the company's production capacity
- Jobs: 275 new positions
- Products: the M and MRACK series, listed for solar, grid, storage and AI data center use
Neither report disclosed the investment. And the stated reason for building it was data centers, not solar. CEO Jim Fusaro said the added capacity gives data center and utility operators more of their critical components from domestic supply.
Why Would a Solar Inverter Maker Chase Data Centers?
Because that's where the orders are. Power conversion is the same trade whether the source is a field of panels, a battery block or the grid feeding a server hall. An inverter factory can pivot between those buyers more easily than a panel factory can.
Is that good news for solar? Mixed. Capacity built for AI loads competes for engineering time, silicon and skilled labor with capacity built for solar. I'd call the claim that this "supports solar" optimistic, and I'm not going to pretend the press materials prove it.
How Big Is 27 GW Next to Home Solar?
Big. SEIA and Wood Mackenzie put US residential installations at 4,647 MWdc in 2025, down 2% on 2024, out of 43.2 GWdc for the whole US market.
Treat the comparison loosely. Inverter nameplate is AC and panel capacity is DC, and a factory's yearly output isn't a US install count. Still, 27 GW is nearly six times the entire 2025 US residential segment. This plant isn't sized for rooftops.
| Item | Figure | Source |
|---|---|---|
| EPC Power full-production capacity | 27 GW/yr (up to 40 GW) | Plant Services |
| US residential solar installed, 2025 | 4,647 MWdc | SEIA |
| US total solar installed, 2025 | 43.2 GWdc | SEIA |
What Is Grid-Forming, and Why Does It Show Up Here?
The coverage of the plant keeps pointing at EPC Power's grid-forming technology. The July report calls it Agile Grid Forming, and the Flex release lists grid-forming power conversion as the thing it's buying.
Here's the plain version. A grid-following inverter reads the grid's voltage and pushes current in step with it. Without that reference it shuts off, which is why most rooftop systems go dark in an outage. A grid-forming inverter creates its own voltage and frequency reference. NREL's research roadmap describes the split as current-source behavior against voltage-source behavior, and notes that grid-forming units can take on roles like restoring a grid after a blackout.
You can see the homeowner version of this in battery-capable inverters, where backup mode only works because the unit forms a small island. Utility-scale grid-forming is the same idea at a vastly larger scale.
What Does the Flex Acquisition Change?
On October 14, 2026, Flex announced it had completed the acquisition of EPC Power. The release gave no price. It describes EPC Power as having more than 15 GW deployed and a platform built for next-generation 800V data center power architectures. EPC Power now sits in Flex's Cloud and Power Infrastructure segment.
One more detail: Flex plans to spin that segment off as Axiom Solutions International in the first calendar quarter of 2027. So the owner of this factory will change twice in a few months. For a utility buyer signing a multi-year supply deal, that's a footnote. For you, it's irrelevant, which is rather the point.
The release says nothing about residential or utility solar at all. Draw your own conclusion from that silence.
Should a Home Solar Buyer Change Anything?
No. That's my honest read, and a reader could reasonably disagree.
Here's what I'd actually do with this news:
- Ignore it for hardware choice. Pick between string, optimizer and microinverter setups on warranty, monitoring and shading (a model like the Enphase IQ8A microinverter is the residential end of that choice), as covered in the power optimizer vs microinverter comparison.
- Watch the grid-forming trend. If utilities buy grid-forming capacity at this scale, rules for what home systems must do during outages may follow. That's speculation on my part, not a reported plan.
- Keep reading your own data. A habit of checking inverter readings tells you more about your system than any factory announcement.
If you're in the EU, the storage side has its own pressures, covered in the battery storage mandate guide.
Summary
EPC Power built a very large inverter plant for very large buyers, and Flex now owns the company. Home solar isn't in the announcements. The one idea worth carrying away is grid-forming: it's a feature to watch for in batteries and backup inverters, and it's a sign of where power electronics money is going. Don't change a purchase over it.