# EDGAR Filing Document

**Accession Number:** 0000354963
**File Stem:** 0001641172-25-018415
**Filing Date:** 2025-7
**Character Count:** 20816
**Document Hash:** a2f83b9520127cd8b077f4a0f3ab5f40
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001641172-25-018415.hdr.sgml**: 20250709

**ACCESSION NUMBER**: 0001641172-25-018415

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250707

**FILED AS OF DATE**: 20250709

**DATE AS OF CHANGE**: 20250709

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ENERGY CAPITAL PARTNERS IV-C, LP
- **CENTRAL INDEX KEY:** 0001726217

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113908

**BUSINESS ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ECP ControlCo, LLC
- **CENTRAL INDEX KEY:** 0001707921

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113913

**BUSINESS ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ENERGY CAPITAL PARTNERS IV-A, LP
- **CENTRAL INDEX KEY:** 0001726198

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113910

**BUSINESS ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ENERGY CAPITAL PARTNERS IV-B, LP
- **CENTRAL INDEX KEY:** 0001726216

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113909

**BUSINESS ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Energy Capital Partners IV-B (Hill City IP), LP
- **CENTRAL INDEX KEY:** 0002032499

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113906

**BUSINESS ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** ENERGY CAPITAL PARTNERS IV-D, LP
- **CENTRAL INDEX KEY:** 0001726219

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113907

**BUSINESS ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 51 JOHN F. KENNEDY PARKWAY, SUITE 200
- **CITY:** SHORT HILLS
- **STATE:** NJ
- **ZIP:** 07078
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Energy Capital Partners GP IV, LP
- **CENTRAL INDEX KEY:** 0001844921

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113911

**BUSINESS ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Energy Capital Partners IV, LLC
- **CENTRAL INDEX KEY:** 0001845291

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-09881
- **FILM NUMBER:** 251113912

**BUSINESS ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901
- **BUSINESS PHONE:** (973) 671-6100

**MAIL ADDRESS:**
- **STREET 1:** 40 BEECHWOOD ROAD
- **CITY:** SUMMIT
- **STATE:** NJ
- **ZIP:** 07901

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Energy Capital Partners GP IV, LLC
- **DATE OF NAME CHANGE:** 20210209
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SHENANDOAH TELECOMMUNICATIONS CO/VA/
- **CENTRAL INDEX KEY:** 0000354963
- **STANDARD INDUSTRIAL CLASSIFICATION:** TELEPHONE COMMUNICATIONS (NO RADIO TELEPHONE) [4813]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 541162807
- **STATE OF INCORPORATION:** VA
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** PO BOX 459
- **STREET 2:** 500 SHENTEL WAY
- **CITY:** EDINBURG
- **STATE:** VA
- **ZIP:** 22824
- **BUSINESS PHONE:** 5409844141

**MAIL ADDRESS:**
- **STREET 1:** P O BOX 459
- **STREET 2:** 500 SHENTEL WAY
- **CITY:** EDINBURG
- **STATE:** VA
- **ZIP:** 22824

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[x] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ECP ControlCo, LLC<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Energy Capital Partners IV, LLC<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Energy Capital Partners GP IV, LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ENERGY CAPITAL PARTNERS IV-A, LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ENERGY CAPITAL PARTNERS IV-B, LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ENERGY CAPITAL PARTNERS IV-C, LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>ENERGY CAPITAL PARTNERS IV-D, LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Energy Capital Partners IV-B (Hill City IP), LP<br><sub>(Last) (First) (Middle)</sub><br>40 BEECHWOOD ROAD<br><sub>(Street)</sub><br>SUMMIT,, NJ 07901<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-07-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>SHENANDOAH TELECOMMUNICATIONS CO/VA/ [ SHEN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-07-07 |  | P<sup>(1)</sup> |  | 15314 | A | 14.3972<sup>(2)</sup> | 2729685 | I | See Footnotes<sup>(3)(4)</sup> |
| Common Stock | 2025-07-08 |  | P<sup>(1)</sup> |  | 28700 | A | 14.6691<sup>(5)</sup> | 2758385 | I | See Footnotes<sup>(3)(4)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) The purchases reported herein were effected pursuant to a Rule 10b5-1 plan adopted by Hill City Holdings, LP ("Hill City") on June 5, 2025.

(2) The price reported in Column 4 is a weighted-average price. These shares were purchased in multiple transactions at prices ranging from $14.29 to $14.51. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

(3) The securities are held of record by Hill City. ECP ControlCo, LLC is the managing member of Energy Capital Partners IV, LLC, which is the general partner of Energy Capital Partners GP IV, LP, which is the general partner of each of (i) Energy Capital Partners IV-A, LP, (ii) Energy Capital Partners IV-B, LP, (iii) Energy Capital Partners IV-C, LP, and (iv) Energy Capital Partners IV-D, LP (the "Funds"). Energy Capital Partners GP IV, LP is also the general partner of Energy Capital Partners IV-B (Hill City IP), LP ("Hill City IP"). Each of (i) Energy Capital Partners IV-A, LP, (ii) Hill City IP, (iii) Energy Capital Partners IV-C, LP, and (iv) Energy Capital Partners IV-D, LP are the members of Hill City Holdings GP, LLC, which is the general partner of Hill City.

(4) ECP ControlCo, LLC is controlled by its board of managers, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Rahman D'Argenio, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo, LLC. As a result of these relationships, each of the foregoing entities and individuals may be deemed to share beneficial ownership of the securities held of record by Hill City. Each such entity and individual disclaims beneficial ownership of these securities except to the extent of their pecuniary interest therein.

(5) The price reported in Column 4 is a weighted-average price. These shares were purchased in multiple transactions at prices ranging from $14.40 to $14.81. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

**Remarks:**
Due to filing limitations of the electronic filing system, each of ECP Fiber Holdings GP, LLC, ECP Fiber Holdings, LP, Hill City Holdings GP, LLC and Hill City Holdings, LP are filing a separate Form 4.

**Signature:** ECP ControlCo, LLC, By: /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV, LLC, By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners GP IV, LP, By: Energy Capital Partners IV, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV-A, LP, By Energy Capital Partners GP IV, LP, its general partner, By Energy Capital Partners IV, LLC, its general partner, By ECP ControlCo, LLC, its managing member, By /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV-B, LP, By Energy Capital Partners GP IV, LP, its general partner, By Energy Capital Partners IV, LLC, its general partner, By ECP ControlCo, LLC, its managing member, By /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV-C, LP, By Energy Capital Partners GP IV, LP, its general partner, By Energy Capital Partners IV, LLC, its general partner, By ECP ControlCo, LLC, its managing member, By /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV-D, LP, By: Energy Capital Partners GP IV, LP, its GP, By: Energy Capital Partners IV, LLC, its GP, By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

**Signature:** Energy Capital Partners IV-B (Hill City IP), LP, By Energy Capital Partners IV-B, LP, By Energy Capital Partners GP IV, LP, By Energy Capital Partners IV, LLC, By ECP ControlCo, LLC, By /s/ Jennifer Gray, General Counsel  
**Date:** 2025-07-09

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**