Percentage of power plants with carbon capture and sequestration (CCS) technology?
If you accept GE's estimate of the number of global fossil fuel power plants ( 17,500 ) and compare it to the number of CCS projects out there ( 22 ), you get roughly 0.1 %. 

The Global CCS Institute released its 2014 annual report; 


  The world’s first large-scale carbon capture and storage (CCS) project in the power
  sector commenced operation in October 2014 at the Boundary Dam power station
  in Saskatchewan, Canada. Two additional large-scale CCS projects in the power
  sector – at the Kemper County Energy Facility in Mississippi and the Petra Nova
  Carbon Capture Project in Texas – are planned to come into operation in 2015 and
  2016 respectively. Construction is also underway on the world’s first large-scale CCS
  project in the iron and steel sector, the Abu Dhabi CCS Project in the United Arab
  Emirates (UAE). These four projects are among the 22 large-scale CCS projects in
  operation or construction around the world – double the number at the beginning of
  the decade.