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                                                                    EXHIBIT 32.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I,  Robert  Noble,  certify,  pursuant  to 18 U.S.C.  Section  1350,  as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge,
Envision Solar  International,  Inc.'s Annual Report on Form 10-K for the fiscal
year ended  December 31, 2009 fully  complies with the  requirements  of Section
13(a) or  15(d)  of the  Securities  Exchange  Act of 1934 and that  information
contained  in such Annual  Report on Form 10-K fairly  presents in all  material
respects  the   financial   condition   and  results  of  operations  of  Casita
Enterprises, Inc.


Date: April 12, 2010                     By: /s/ Robert Noble
                                            ------------------------------------
                                        Name:  Robert Noble
                                        Title: Chief Executive Officer

This  certification  accompanies  the  Annual  Report on Form 10-K  pursuant  to
Section 906 of the  Sarbanes-Oxley Act of 2002 and shall not be deemed filed for
purposes  of  Section  18 of the  Exchange  Act,  or  otherwise  subject  to the
liability  of  that  section.  This  certification  shall  not be  deemed  to be
incorporated  by  reference  into any  filing  under the  Securities  Act or the
Exchange  Act,  except to the extent that  Envision  Solar  International,  Inc.
specifically incorporates it by reference