Filing search / Ownership / Southwestern Public Service / Page 16

CORRESP

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25 May 06

Correspondence with SEC

12:00am

UPLOAD

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26 Apr 06

Letter from SEC

12:00am

8-K

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15 Jul 05

Other Events

12:00am

POS AM

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18 Mar 04

Prospectus update (post-effective amendment)

12:00am

424B3

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9 Feb 04

Prospectus supplement

12:00am

S-4/A

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3 Feb 04

Registration of securities issued in business combination transactions (amended)

12:00am

S-4

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21 Jan 04

Registration of securities issued in business combination transactions

12:00am

8-K

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3 Oct 03

Other events

12:00am