SEC Filing Document

Company: ERock, Inc.
Ticker: 
CIK: 2110029
Filing Type: DRS/A
Document Type: DRS/A
Date Filed: 2026-04-01
Accession Number: 0001193125-26-138217
Exchange: 
SIC Code: 3620
SIC Description: Electrical Industrial Apparatus
URL: https://www.sec.gov/Archives/edgar/data/2110029/000119312526138217/filename1.htm

Chunk 2 of 104
Word Count: 1437
Character Count: 9810

Document Content:

may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks, service marks, trade names or products in this prospectus is not intended to, and does not imply, a relationship with us or an endorsement or sponsorship by or of us. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus may appear without the ®, ™ or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable licensor to these trademarks, service marks and trade names. Table of Contents GLOSSARY OF INDUSTRY AND EROCK TERMS The terms and abbreviations defined in this section are used throughout this prospectus: • “AI” refers to artificial intelligence.

• “Annualized Recurring Service Revenue” refers to the annualized value of recurring revenue under
contracted operations and maintenance service and asset management agreements as of the measurement date, including both fixed contractual payments and variable payments based on typical utilization of such services.

• “backup power” or “resiliency” refers to a mode in which our power systems provide
continuity for operations during grid disruptions and extreme weather events.

• “Blocked Unitholders” refers to certain pre-IPO owners that will receive shares of Class A common
stock of us pursuant to the Blocker Mergers (including Energy Impact Fund (FT-B) LP) as defined and described in “Organizational Structure—Blocker Mergers.”

• “bridge power” refers to a mode in which our power systems provide temporary generation to meet
customer needs during the period before full grid interconnection becomes available.

• “C&I” refers to commercial and industrial.

• “CAISO” refers to the California Independent System Operator.

• “CARB” refers to the California Air Resources Board.

• “CARB-DG” refers to the California Air Resources Board
Distributed Generation certification standard.

• “CO” refers to carbon monoxide.

• “CO2” refers to carbon dioxide.

• “Common Units” refers to the interests in ER Holdings called “Common Units” that are
outstanding prior to the Reclassification.

• “conditional firm interconnections” refers to firm service except during certain identified system
conditions.

• “Continuing Equity Unitholders” refers to certain pre-IPO holders of Common and/or Preferred Units
who will hold Class B Units following the Reclassification (including Energy Impact Fund (FT-D) LP), as described under “Organizational Structure.”

• “Contracted Power System Sales Backlog” refers to the actual contracted value for purchases of
power systems and ESI services, whether invoiced or not, to be invoiced and recognized as revenue as a result of performing our obligations over the term of the contract, assuming no exceptions or contingencies are exercised, and includes
adjustments for contract modifications entered into after period-end and prior to the issuance of the related financial disclosures.

• “dispatchable power” or “flexible capacity” refers to a mode in which our power
systems are configured as on-demand, fast-response resources.

• “ECU” refers to electronic control unit.

• “ERCOT” refers to the Electric Reliability Council of Texas.

• “ESI” refers to equipment, supply and installation.

• “FERC” refers to the Federal Energy Regulatory Commission.

• “GHG” refers to greenhouse gases.

• “Gigawatt” or “GW” refers to one billion watts.

Table of Contents

• “Grid Support Event” refers to any period during which the electrical grid is experiencing actual
or anticipated constraints and the Company utilizes customer-owned power systems to provide power to support grid stability. Grid Support Events may occur pursuant to a direct request from the grid operator or through participation in incentive
based programs that compensate generators for providing such support.

• “IEA” refers to the International Energy Agency.

• “IPO” or this “offering” refers to the initial public offering of shares of
Class A common stock by us.

• “ISO” refers to Independent System Operator.

• “ISO 8528-5 G3” refers to the International Organization
for Standardization standard for reciprocating internal combustion engine driven generating sets, Part 5: Generating sets, specifically the G3 classification for transient performance.

• “installed base” refers to the total installed watt capacity of our power systems that have been
deployed and are currently operational.

• “Megawatt” or “MW” refers to one million watts.

• “MISO” refers to the Midcontinent Independent System Operator.

• “NERC” refers to the North American Electric Reliability Corporation.

• “NMHC” refers to non-methane hydrocarbons.

• “NOCs” refers to network operations centers.

• “NOx” refers to nitrous oxides, including nitric oxide and nitrogen dioxide.

• “O&M” refers to operations and maintenance.

• “PJM” refers to PJM Interconnection, the regional transmission organization coordinating the
wholesale electricity market in all or parts of 13 states and the District of Columbia.

• “Preferred Units” refers to the interests in ER Holdings called “Preferred Units” that
are outstanding prior to the Classification.

• “prime power rating” refers to, as defined by the industry standard
ISO8528-1, is the maximum power which a generating set is capable of delivering continuously while supplying a variable electrical load when operated for an unlimited number of hours per year under the agreed
operating conditions with the maintenance intervals and procedures being carried out as prescribed by the manufacturer.

• “RTO” refers to regional transmission organization.

• “SCADA” refers to supervisory control and data acquisition systems.

• “Tier 2” refers to capacity additions that include capacity that has been requested but that has
not received approval for planning requirements.

• “transient performance” refers to our power systems’ ability to respond to sudden changes in
electrical load, including how quickly and how stably it can adjust its output and maintain voltage and frequency when the load increases or decreases unexpectedly.

• “TRIR” refers to total recordable incident rate.

• “TWh” refers to terawatt-hour.

• “utility-grade” refers to electrical power produced with voltage, frequency and reliability
characteristics consistent with those provided by an electric utility.

• “WECC” refers to the Western Electricity Coordinating Council.

Table of Contents

PROSPECTUS SUMMARY

This summary highlights selected information discussed in this prospectus. The summary is not complete and does not contain
all of the information you should consider prior to making an investment decision with respect to our Class A common stock. Therefore, you should read this entire prospectus carefully, including the sections titled
“Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and our financial statements and the related
notes included elsewhere in this prospectus, before making a decision to purchase shares of our Class A common stock. Some of the statements in this summary constitute forward-looking statements. See
“Cautionary Statement Regarding Forward-Looking Statements.”

Overview

We are a vertically integrated company that designs, deploys, operates and maintains multi-purpose distributed power systems,
consisting of our proprietary, low emission, quick-response natural gas generator and embedded software technology, for our customers. Our resilient, cost-effective, modular power systems can be rapidly deployed at a scale of more than 1 GW to meet
our customers’ full range of power needs, including bridge, backup and dispatchable power applications, and are supported by our operations and maintenance (“O&M”) and asset management services. We deploy our systems in three
applications: bridge (prime-to-backup), backup (resiliency) and dispatchable (flexible capacity) power.

• Bridge power
(prime-to-backup) . Our power systems deliver prime power in the near-term to accelerate time-to-power ahead of long-lead grid upgrades, which prevent our customers
from getting grid power. Once interconnection becomes available, the same assets typically transition to backup or flexible dispatch power service to support the customer or utility.

• Backup power (resiliency) . Our power systems provide highly reliable continuity for mission-critical
operations during grid disruptions and extreme weather events, and many of our existing deployments operate in this mode today.

• Dispatchable power (flexible capacity) . Our power systems are configured as on-demand, fast-response
resources and can be deployed by contract to market-facing objectives (such as peak-load management or grid-stability services).

We primarily serve data centers, utilities and large C&I businesses across eight U.S. states, with our largest operating
footprints located in California and Texas, where we anticipate disproportionate growth and market potential driven by high data center demand in the near- and medium-term. With over 15 years of operational experience, over 2,000 deployed units
across approximately 400 operational sites consisting of an installed base of approximately 1,000 MW and Contracted Power System Sales Backlog of approximately $1.2 billion as of December 31, 2025, we believe we are one of the most
established, proven providers of bridge, backup and dispatchable power applications for the growing distributed power generation market.

Table of Contents

Target states represent those currently in our pipeline or designated as target
geographies by our management.