The webapp provides for each item the link on ECB's website.
Speeches for : Tommaso Padoa-Schioppa where "power" appeared
2004-05-13 : Shaping the payment system: a central bank's role2003-07-07 : Central banks and financial stability
2002-02-22 : Remarks at the roundtable: Mid-term review of progress towards European financial integration
1998-09-03 : On the eve of the euro