Energy Storage Marketing: How Form Energy Made Rust a Feature

Energy storage marketing is the practice of making long-duration battery technology feel understandable and urgent to utilities, regulators, hyperscalers, and investors who plan in decades rather than quarters.

Form Energy is the clearest live example available in 2026. The company builds iron-air batteries that store electricity by rusting iron and then reversing the rust. Form Energy has raised more than $1.2 billion, operates a 550,000 square foot factory on a former steel mill site in West Virginia, and in February 2026 announced the largest battery system by energy capacity ever announced anywhere.

Most marketing teams would treat "our product rusts" as a liability to bury. Form made it the headline.

This breakdown covers the five positioning decisions behind that choice, and how climate tech and clean energy founders can apply the same logic.

‍

What Is Energy Storage Marketing?

Energy storage marketing is the discipline of communicating battery and grid storage technology to utility buyers, public utility commissions, corporate offtakers, and infrastructure investors. It prioritizes reliability, cost per kilowatt-hour, safety, and delivery timelines over broad sustainability messaging.

The audience is small and technical. A long-duration storage company may sell to fewer than 200 buying organizations worldwide, which changes how every piece of content should be built.

‍

Why a Battery That Rusts Is a Positioning Problem

Rust signals decay. It is what happens to bridges, cars, and factories nobody maintains, which makes it the worst available association for a product sold on multi-decade reliability.

Form Energy's chemistry depends on it. Oxygen from the air rusts iron pellets inside the cell to release electricity, and an electrical current reverses that reaction to recharge.

The safe move would have been to write "metal-air electrochemistry" and hope nobody translated it. Form did the opposite, and that decision is why the technology now reads as inevitable rather than fragile.

‍

How Form Energy Turned Reversible Rusting Into a Selling Point

CEO Mateo Jaramillo describes the product in six words. The company is "rusting and unrusting iron, electrochemically."

That sentence does three jobs at once. It is memorable, it is technically accurate, and it removes any suspicion that jargon is covering something up.

Jaramillo has also said Form stayed quiet for years specifically to avoid unnecessary hype around what it was building. Seven years of research happened with almost no public noise. In a sector where overclaiming is the default setting, restraint became the differentiator.

‍

Why Form Energy Sells Reliability Instead of Climate Impact

Form Energy rarely leads with emissions. It leads with the grid staying on. The core claim is 100 hours of continuous discharge, roughly 25 to 50 times the two to four hours most lithium-ion systems deliver.

Utility executives and data center operators are not buying climate outcomes. They are buying firm capacity they can defend in a rate case or a board meeting.

‍

How a Closed Steel Mill Became the Company's Strongest Story

Form Factory 1 occupies 55 acres in Weirton, West Virginia, on the site of what was once the state's largest steel mill and largest private employer. Total direct investment reaches up to $760 million, with plans for more than a million square feet and at least 750 workers by 2028.

Iron-air batteries need iron, and the American steel belt already knows how to make it. The reinvention narrative was not invented for press releases. It is a real supply chain advantage that happens to work simultaneously for investors, policymakers, and regional media.

‍

Why Publishing the Trade-Offs Increased Trust

Iron-air batteries are heavy and comparatively inefficient. Round-trip efficiency sits roughly between 50% and 70%, against about 90% for lithium-ion. Form Energy does not hide this.

The company frames the product as a different tool for a different job: low cost, slow, safe, built from iron, water, and air rather than scarce critical minerals, with no thermal runaway risk and a rating above 10,000 charge cycles.

Stating what the battery is bad at also removes Form from a price war it cannot win and defines a category where it has no direct competitor. This is the same principle behind climate tech messaging that avoids greenwashing accusations.

‍

How Founder-Led Content Became the Distribution Channel

Form's largest announcements land first as first-person posts from Jaramillo, before trade press picks them up. His framing of the Google data center deal was deliberately flat: the team had been heads down for a while, and here is the largest battery system by energy capacity ever announced.

He also appears on podcasts and in long interviews explaining the chemistry from first principles rather than reciting positioning language.

In our work with climate tech and deep tech founders, this pattern holds consistently. When the buying group is small and technical, founder-led video outperforms paid reach at every budget level.

‍

What the Narrative Actually Produced

Marketing does not close utility contracts on its own, but narrative discipline shows up in the commercial pipeline.

• More than $1.2 billion raised, including a $405 million Series F led by T. Rowe Price with GE Vernova participating
• A 300 MW / 30 GWh system for a Google data center in Pine Island, Minnesota, delivered with Xcel Energy and paired with 1.4 GW of wind and 200 MW of solar
• A 12 GWh supply agreement with AI data center developer Crusoe, signed at CERAWeek 2026, with deliveries from 2027
• A first project outside the United States with FuturEnergy Ireland, 10 MW / 1,000 MWh, targeted for 2029
• Thousands of megawatts of iron-air storage written into PacifiCorp's 2025 integrated resource plan

The noise started only when there was something real to show.

‍

How to Apply the Form Energy Playbook

You do not need $1.2 billion to run this playbook. It reduces to five decisions any clean energy marketing team can make this quarter.

1. Name the strange thing first

If your technology has an odd mechanism, describe it in plain words before a skeptic describes it for you.

2. Lead with the buyer's problem

Uptime, cost, compliance, delivery date. Climate impact is the closing argument, not the opening one.

3. Anchor the abstract in a place

A factory, a town, a site, a headcount. Physical specificity makes deep tech feel real to people who will never read your spec sheet.

4. Publish one honest limitation

Efficiency, scale ceiling, timeline. It buys credibility for every other number you release.

5. Put the founder on camera

A technical founder explaining the mechanism converts better than a polished brand film with a voiceover.

‍

Turning Technical Depth Into Content People Watch

At Alluvium Media, we build video content for climate tech, energy, and deep tech founders with exactly this problem. The technology is remarkable and almost nobody can explain it in under two minutes.

We film founders, cut facility footage into short-form assets, and turn one recording session into the explainer, the investor cut, the LinkedIn clips, and the sales follow-up. You can see the approach in our case studies.

The Form Energy lesson is not that rust makes good marketing. It is that the thing you are tempted to hide is usually the thing worth showing.

If your energy storage story is stuck inside a pitch deck, book a call with our team.