🔋Eos Energy Enterprises, Inc.🔋

Eos is reimagining energy storage to enable a future of limitless energy—energy so abundant and reliable that it can fuel humanity’s limitless potential.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

On July 15th, 2026, Eos was selected for Golden Dome for America, the initiative safeguarding our nation.

American-made energy storage, designed with American ingenuity, built with American determination for the missions where power cannot fail.

From the factory floors of Pennsylvania to the front lines of national security, Eos is powering a stronger, more secure, independent America.

Eos. American energy. Unstoppable.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

America’s defense runs on power that cannot fail.

At @SenMcCormickPA's Defense and Innovation Summit, @POTUS announced Eos has been awarded a Golden Dome for America contract, stating "Eos in Pittsburgh just agreed to a multi-million dollar partnership with the Department of War to build energy storage technology in support of our Golden Dome missile defense."

This strategic partnership with the Department of War strengthens the energy backbone of America's defense and is structured to scale as national defense needs evolve.

Read the full press release: https://t.co/VCc5FVBKlh

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

If you are having trouble accessing the virtual investor presentation on mobile phones, please follow these instructions to make sure pop-up blockers are disabled.

To allow pop-ups in Safari:
1. Open the iOS Settings app
2. Scroll down to Apps and tap Safari.
3. Under the General section, toggle the Block Pop-ups switch to the OFF position.
4. Close and restart your Safari browser to launch the link again.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Attention Rights Holders:

Eos has made available a virtual investor presentation related to the previously announced rights offering. The virtual investor presentation may be accessed on NetRoadshow at https://t.co/YXQOHzqKoj and will be available until the rights offering expires at 5.00 p.m., New York City time, on July 21, 2026.

If you have specific questions regarding the rights offering, please contact Sodali & Co., the Company’s information agent for the rights offering, at [phone] (For Banks and Brokers), [phone] (Toll Free), or by email at [email protected].

See https://t.co/lTwjAb67ZZ for shareholder resources regarding the rights offering.

DISCLAIMER: please read the disclaimer at https://t.co/MAniO2UnVh for important information.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Attention Stockholders:

DTC distributed the rights to banks and brokerage firms on Thursday. If you hold your shares through a brokerage account, your rights may not appear immediately.

Given the holiday weekend, some brokers may still be completing their internal processing before rights are credited to client accounts and notifications are sent.

If you do not yet see your rights in your account, please allow additional time for your broker's processing procedures, as timing may vary among financial institutions.

If you have specific questions regarding your rights distribution, please contact Sodali & Co., the Company’s information agent for the rights offering, at [phone] (For Banks and Brokers), [phone] (Toll Free), or by email at [email protected].

See https://t.co/lTwjAb67ZZ for shareholder resources regarding the rights offering.

DISCLAIMER: please read the disclaimer at https://t.co/MAniO2UnVh for important information.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Today, Eos announced the commencement of its rights offering. The offering is intended to raise equity capital to fund Eos’ planned investment in Frontier Power USA, as described in the Company’s public filings.
Rights offering information: https://t.co/7HvJ4ldXCg
Read more: https://t.co/pnRWYwoalh
Disclaimer: https://t.co/26jETeNJvg

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Eos CEO, Joe Mastrangelo, will join Mark Strouse for a Fireside Chat at the J.P. Morgan Natural Resources Conference today at 9:10am ET!

Join the live webcast here: https://t.co/qIx6EBXNWK

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

The first Eos Cube built entirely with batteries from Battery Line 2 has shipped.

The batteries were produced at our Thorn Hill manufacturing facility, where we moved from Site Acceptance Testing into commercial production in four days. The Cube was assembled at our Turtle Creek facility.

Two battery lines are now running. Line 1 surpassed its full-year 2025 output in 164 days. Line 2 is launched and delivering.

This is scale meeting execution on the path to 4 GWh of American-made annual capacity.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Attention Eos Shareholders!

Proxy voting is now open through June 2 and the Board of Directors recommends voting FOR all five proposals! Vote using the instruction form provided by your broker and visit https://t.co/tIhvrx36mh to have your voice heard.

For information on the five proposals to be voted on at the annual meeting, visit the Annual Reports & Proxy Statements page of the Eos IR website: https://t.co/9cTLFdbl3H

For information on how to vote, visit the Annual Meeting Resources section of the IR Resources page of the Eos IR website: https://t.co/9ISwhARfIB

Every vote matters, and your voice adds real weight.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Everyone is counting megawatt additions to power AI. The real constraint is millisecond reaction to demand fluctuations. Most storage wasn’t built for that.

We tested it. We validated it. Millisecond response. Sustained rapid cycling. No measurable degradation.

This is not storage adapted for AI. It’s storage engineered for the realities AI inference creates.

Full technical breakdown: https://t.co/sO3iAAIq5J

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Stop waiting. Start powering.

Power is on the critical path. Capacity is needed in months, not years.

To keep up with accelerating AI demand, Eos and TURBINE-X have partnered to deliver a new model of infrastructure designed specifically for constrained, high-load environments.

At @DataCenterWorld today, both the Eos and TURBINE-X teams are on the floor ready to talk directly about this partnership and what it unlocks for hyperscale operators.

Accelerated timelines. High density, compact footprint. Millisecond-class storage response. Integrated gas-fired generation with Eos Indensity™ storage architecture is the fastest path to future-proof, reliable power for hyperscale data centers.
#DataCenterWorld

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Imbalance doesn’t have to cascade.

When a single module falls out of balance, DawnOS™ isolates it and routes around the issue. Keeping the string online with less than 1% impact.

Most modules recover on their own and are automatically reintegrated. No technician. No restart. No downtime.

That’s how more installed capacity becomes usable capacity, and why the economics of storage change when imbalance is contained at the source.

Read the DawnOS paper: https://t.co/ZS0FFKvWQf

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

In most storage systems, installed capacity ≠ usable capacity.

Energy gets stranded because controls are designed around the weakest module—so systems are oversized to compensate.

By managing imbalance at the module level, DawnOS™ allows Eos systems to deliver virtually all installed energy and stay operational.

The result: More delivered energy. More predictable performance. More value from the same infrastructure.

Our technical paper breaks down how this shift changes real‑world system economics.

Read the DawnOS paper: https://t.co/ZS0FFKwuFN

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

To meet accelerating AI demand, infrastructure has to move faster—and at scale.

Eos has entered a Joint Development Agreement with TURBINE‑X to develop private power infrastructure for AI.

By integrating gas‑fired generation with Eos Indensity™ storage architecture, this model is designed to provide dispatchable, on‑site power in months, not years, aligned with AI deployment timelines.

Read the full announcement here: https://t.co/dch57LabKp

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Our 2025 Annual Report and Shareholder Letter is available now. Hear directly from our CEO, Joe Mastrangelo, and read the full report here: https://t.co/RK7d7WB3YO

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

In our earlier battery management system (BMS) architecture, a single imbalanced module could take an entire string offline—stranding energy across every module it was grouped with. We engineered around it. Oversized systems to deliver performance. Dispatched technicians when it happened. Accepted the downtime. It was the cost of doing business.

We decided it didn’t have to work that way.

Eos DawnOS™ is the result. A module-level BMS, built from the ground up for zinc-halide chemistry. When a module falls out of balance, the system can route around the issue. The string keeps running. Energy loss stays under 1%.

And because zinc is inherently resilient, most modules can recover on their own and reintegrate automatically.

No technician. No downtime.

That’s how installed capacity becomes usable capacity—and what five years of iterative development looks like.

For Eos Cubes with Z3™ modules already in the field, DawnOS can unlock trapped energy. Hardware, firmware, and software upgrades working together to bring deployed systems to full performance.

Full technical breakdown linked here: https://t.co/ZS0FFKvWQf

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Reminder!

The record date is Monday, April 13. Only shareholders on record as of April 13 can vote at the Annual Meeting. If your shares are loaned, pledged, or held on margin, you may not be able to vote unless they are returned to your account in advance of the record date. For instructions on how to confirm your ability to vote, visit the Annual Meeting Resources section of the IR Resources page of the Eos IR website: https://t.co/GXAyhCCWfz

For more information on the proposals to be voted on at the annual meeting, stockholders should review our preliminary proxy statement.

Every vote matters, and your voice adds real weight.

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Eos is exhibiting at @DataCenterWorld 2026, where industry leaders will convene to address the growing intersection of data center expansion, energy demand, and grid reliability.

As energy storage evolves beyond backup applications, Eos will highlight the power challenges facing data centers and hyperscalers amid growing demand and load volatility—and how American advanced storage infrastructure, like Eos, can support more resilient, flexible, and efficient power strategies.

We look forward to connecting with leaders, operators, and partners to discuss the role of storage in reliable, scalable infrastructure.

Want to connect? Reach out to [email protected]

[🔋Eos Energy Enterprises, Inc.🔋 @PoweredByEos]

Attention Eos Stockholders!

Earlier this week, Eos filed a preliminary proxy statement ahead of our 2026 annual meeting. Only shareholders on record as of April 13th can vote at the Annual Meeting.

If your shares are loaned, pledged, or held on margin, you may not be able to vote unless they are returned to your account in advance of the record date. For instructions on how to confirm your ability to vote, visit the Annual Meeting Resources section of the IR Resources page of the Eos IR website:
https://t.co/cvmSwOZdpU

Every vote matters, and your voice adds real weight.