Exhibit 32

CERTIFICATIONS OF CEO AND CFO PURSUANT TO 
18 U.S.C. SECTION 1350, 
AS ADOPTED PURSUANT TO 
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection
with this Annual Report on Form 10-K of the Ridgewood Energy S Fund, LLC (the
Fund) for the fiscal year ended December 31, 2007, as filed with the
Securities and Exchange Commission on the date hereof, (the Report), each of
the undersigned officers of the Fund hereby certifies, pursuant to 18 U.S.C.
(section) 1350, as adopted pursuant to (section) 906 of the Sarbanes-Oxley Act
of 2002, that to the best of their knowledge:

| |     |                                                                                                                                                    
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------
| | (1) | The Report
 fully complies with the requirements of Section 13(a) or 15(d) of the
 Securities Exchange Act of 1934; and                            
| |     |                                                                                                                                                    
| | (2) | The
 information contained in the Report fairly presents, in all material
 respects, the financial condition and results of operations of the Fund.

|       |                 |        |  |                                                      
|------ | --------------- | ------ |  | -----------------------------------------------------
|Dated: | March 14,
 2008 |        |  | RIDGEWOOD
 ENERGY S FUND, LLC                        
|       |                 |        |  |                                                      
|       | By:             | /s/    |  | ROBERT E.
 SWANSON                                   
|       |                 | Name:  |  | Robert E.
 Swanson                                   
|       |                 | Title: |  | President
 and Chief Executive Officer               
|       |                 |        |  | (Principal
 Executive Officer)                       
|       |                 |        |  |                                                      
|Dated: | March 14,
 2008 |        |  |                                                      
|       | By:             | /s/    |  | KATHLEEN P.
 MCSHERRY                                
|       |                 | Name:  |  | Kathleen P.
 McSherry                                
|       |                 | Title: |  | Executive
 Vice President and Chief Financial Officer
|       |                 |        |  | (Principal
 Financial and Accounting Officer)        

A signed original of this
written statement or other document authenticating, acknowledging, or otherwise
adopting the signature that appears in typed form within the electronic version
of this written statement has been provided to Ridgewood Energy S Fund, LLC and
will be retained by Ridgewood Energy S Fund, LLC and furnished to the
Securities and Exchange Commission or its staff upon request. The foregoing
certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and
is not being filed as part of this report or as a separate disclosure document.

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