On 21.07.2010 the WDR broadcasted a part of their series "Lokalzeit" . The main topic was cooling a power plant in summertime. The film shows very good pictures of the cooling water make up in the RWE power plant in Niederaußem, which was realized by HAGER + ELSÄSSER.
The Film is still available in the "WDR-Mediathek" - unfortunately only in German:
http://www.wdr.de/mediathek/html/regional/2010/07/21/lokalzeit-koeln-kuehlung-kraftwerk.xml