<prompt> Translate the following text to EnglishUhakiki huu wa GW 10 wa ukarabati wa scrubber hadi 2005 uligunduliwa kutoka kwa tofauti kati ya masaa ya kazi ya boilermaker inayopatikana kutoka kwa wanachama wa boilermaker wanaofanya kazi katika sekta ya huduma ya umeme na masaa ya kazi inayohitajika kukamilisha ukarabati wa teknolojia ya kudhibiti na miradi mingine ya huduma ya umeme.  <response>: This estimate of 10 GWe of scrubber retrofits by 2005 was determined from the difference between the boilermaker labor hours available from the boilermaker membership working in the electric utility industry and the labor hours needed to complete control technology retrofits and other electric utility projects. 