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UNITED STATES SECURITIES AND EXCHANGE COMMISSION 
WASHINGTON, D.C. 20549

FORM 10-K/A AMENDMENT NO. 1

|x                                             | ANNUAL   REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934    
|--------------------------------------------- | ------------------------------------------------------------------------------------------
|                                              |                                                                                           
|For the fiscal year ended December   31, 2006
|                                              |                                                                                           
|or                                            |                                                                                           
|o                                             | TRANSITION   REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
|                                              |                                                                                           
|                                              | For   the transition period from _____ to _____                                           

Commission File No. 000-51267

RIDGEWOOD ENERGY L FUND, LLC(Exact name of registrant as specified in its charter)

|Delaware                                                           | 11-3719724                            
|------------------------------------------------------------------ | --------------------------------------
|(State or other   jurisdiction of   incorporation or organization) | (I.R.S. Employer   Identification No.)

1314 King Street, Wilmington, Delaware 19801(Address of principal executive offices) (Zip code)

(302) 888-7444(Registrants telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act: None Securities registered pursuant to Section 12(g) of the Act:

Shares of LLC Membership Interest

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

|Yes
o | No
x
|----- | ----

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.

|Yes
o | No
x
|----- | ----

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.

|Yes
x | No
o
|----- | ----

Indicate by check mark if the disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained herein, to the best of the registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.
x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Act. (Check one):

| | Large accelerated filer | o | Accelerated filer | o | Non-accelerated filer | x
| | ----------------------- | - | ----------------- | - | --------------------- | -

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

|Yes
o | No
x
|----- | ----

There is no market for the Shares. The aggregate capital contributions made for the Registrants voting Shares held by non-affiliates of the Registrant at March 30, 2007 was approximately $51.4 million and as of that date there are 350.1081 Shares outstanding.

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RIDGEWOOD ENERGY L FUND, LLC

EXPLANATORY NOTE

This Amendment No. 1 on Form 10-K/A
(the Form 10-K/A) to the Annual Report on Form 10-K for the year ended
December 31, 2006, which was initially filed by Ridgewood Energy L Fund LLC (the
Fund) with the Securities and Exchange Commission (the SEC) on
March 30, 2007 (the Original Filing) is being filed with the SEC to
amend Item 15(b) of Part IV of the Original Filing to contain certifications of the
Chief Executive Officer and Chief Financial Officer of the Fund, as required by Section
906 of the Sarbanes-Oxley Act of 2002, that change the referred to date of the Annual
Report on Form 10-K to December 31, 2006 (the certification in the Original
Filing erroneously referred to the Annual Report on Form 10-K for the year ended
December 31, 2005).
The Section 906 certifications of the Funds Chief Executive Officer and Chief
Financial Officer are filed as Exhibit 32 to this Form 10-K/A.

All information contained in this Form 10-K/A is as of the date of the Original Filing and does not reflect any subsequent information or events other than as described above.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

|                     | RIDGEWOOD   ENERGY L FUND, LLC
|-------------------- | ------------------------------
|                     |                               
|                     |                               
|Date: August 3, 2007 | By:                           
|                     |                               
|                     |                               
|                     |                               
|                     |                               

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

|Signature                |  | Capacity                                                                         |  | Date          
|------------------------ |  | -------------------------------------------------------------------------------- |  | --------------
|                         |  |                                                                                  |  |               
|                         |  |                                                                                  |  |               
|/s/ ROBERT E. SWANSON    |  | Chief Executive Officer    (Principal Executive Officer)                         |  | August 3, 2007
|                         |  |                                                                                  | 
|Robert E. Swanson        |  |                                                                                  | 
|                         |  |                                                                                  |  |               
|                         |  |                                                                                  |  |               
|/s/ KATHLEEN P. MCSHERRY |  | Senior Vice President and Chief Financial Officer (Principal Accounting Officer) |  | August 3, 2007
|                         |  |                                                                                  | 
|Kathleen P. McSherry     |  |                                                                                  | 

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