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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Plains All American GP LLC   2. Issuer Name and Ticker or Trading Symbol PAA NATURAL GAS STORAGE LP [PNG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 333 CLAY STREET, SUITE 1600 3. Date of Earliest Transaction (Month/Day/Year) 05/05/2011 (Street) HOUSTON, TX 77002 4. If Amendment, Date Original Filed(Month/Day/Year) 05/09/2011 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Units 05/05/2011   X   62,500 D $ 0 (1) 28,210,370 I See Note (2) Common Units 05/05/2011   P(3)   3,828 A $ 23.27 28,214,198 I See Note (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Phantom Common Units (4)

$ 0 (1)

05/05/2011

X

62,500

05/05/2011

05/05/2012

Common Units

62,500

$ 0

0

I

See Note 2 (2)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Plains All American GP LLC 333 CLAY STREET, SUITE 1600 HOUSTON, TX 77002		X
Plains AAP, L.P. 333 CLAY STREET, SUITE 1600 HOUSTON, TX 77002		X
PAA GP LLC 333 CLAY STREET, SUITE 1600 HOUSTON, TX 77002		X
PLAINS ALL AMERICAN PIPELINE LP 333 CLAY STREET, SUITE 1600 HOUSTON, TX 77002		X

Signatures

/s/ Tim Moore, Vice President		05/18/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	1-for-1 common units of PNG for phantom units granted by PAA under Transaction Grant Agreements dated September 9, 2010.
(2)	PAA GP LLC, is the general partner of Plains All American Pipeline, L.P. ("PAA"), the record holder of the units. Plains AAP, L.P. owns all of the membership interests in PAA GP LLC and Plains All American GP LLC is the general partner of Plains AAP, L.P. Accordingly, Plains All American GP LLC, Plains AAP, L.P. and PAA GP LLC may be deemed to be indirect beneficial owners of any securities held by PAA. PAA is also the sole member of PNGS GP LLC, which is the general partner of the Issuer.
(3)	Units withheld for taxes.
(4)	Phantom Common Units granted by PAA to Greg L. Armstrong, Harry N. Pefanis and Al Swanson pursuant to Transaction Grant Agreements dated September 9, 2010.

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