Dec 17 (Reuters) - Tidewater Midstream and Infrastructure Ltd TWM.TO :
* TIDEWATER ANNOUNCES TRANSALTA'S OWNERSHIP INTEREST IN THE PIONEER PIPELINE AND DIVIDEND ANNOUNCEMENT
* TIDEWATER MIDSTREAM AND INFRASTRUCTURE LTD - CO'S INVESTMENT WILL BE APPROXIMATELY $90 MILLION
* TIDEWATER MIDSTREAM AND INFRASTRUCTURE LTD - TRANSALTA HAS EXERCISED ITS OPTION TO ACQUIRE A 50 PERCENT OWNERSHIP INTEREST IN PIONEER PIPELINE