Wind, solar, and storage are the only new categories of generation to reach the US power system at scale in fifty years. Craig Gordon thinks his company is adding one. Mainspring Energy’s linear generator drives magnets through copper coils rather than burning fuel in a flame, switches between natural gas, biogas, propane, and hydrogen under load, and ramps from minimum to full output in 25 seconds.

The same modular unit is going into a municipal utility’s fleet in Utah, an islanded truck depot in Los Angeles, dairy digesters in California, and data centers. It is still a gas-fired resource. The flameless reaction suppresses NOx rather than carbon, and the carbon case rests on burning less fuel per megawatt hour than the engines and turbines it displaces.

In ERCOT it arrives at a useful moment. Large load requests run into the hundreds of gigawatts, most of them data centers, against a small fraction approved to energize. The Batch Zero process approved in June will sort which projects get firm grid capacity, and generation on a customer’s own site never enters it. Gordon does not treat that as a substitute for building the grid, and says the answer is both.

On this week’s Energy Capital Podcast, Matt Boms talks with Craig Gordon, head of business development for Mainspring, who heads global policy and regulatory affairs at Mainspring after 12 years at Invenergy. The conversation covers:

* How a linear generator works, magnets driven through copper coils 13 times a second, with no flame, water, or oil.

* Where the units are going, a 48 MW project for a Utah municipal utility and a Los Angeles depot charging 96 electric trucks with no grid connection.

* What it burns, natural gas today, with dairy and landfill biogas running in California at small scale and hydrogen far off at current production costs.

* Running alongside solar and batteries, covering the hours renewables do not, and how it compares with engines, turbines, and fuel cells.

How much of ERCOT’s queued load ends up served on site rather than through the grid will shape what Texas has to build.

Chapters:

00:00 – Introduction and Guest Background

00:40 – From Ameren to Invenergy to Mainspring

03:43 – What Mainspring Builds and Why It Matters

06:19 – How a Linear Generator Works

08:39 – Why Customers Are Generating Power Locally

11:02 – Data Centers, DERs, and Grid Investment

12:16 – Ramping and Efficiency vs Engines, Turbines, and Fuel Cells

14:27 – UMPA's 48 MW Project and the Prologis Microgrid

17:28 – Maintenance, O&M Hubs, and Field Lessons

18:39 – Fuel Flexibility, Biogas, and Hydrogen

20:36 – Scaling to Hundreds of Megawatts, and Islanded vs Grid-Parallel

25:37 – ERCOT's Cluster Study and the Interconnection Queue

29:21 – Policy Barriers, Air Permits, and Behind-the-Meter Value

33:57 – Linear Generators in 10 Years

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