This paper evaluates various calcium-based chemical looping concepts to be applied in Integrated Gasification Combined Cycle (IGCC) plants for decarbonised energy vectors poly-generation (with emphasis on power generation and hydrogen and power co-generation). Two calcium-based chemical looping configurations were analysed. The first concept is based on post-combustion capture using the flue gases resulted from the power block (combined cycle gas turbine). The second concept is based on pre-combustion capture, the calcium-based chemical looping systems being used simultaneous to capture carbon dioxide (by sorbent enhanced water gas shift) and to concentrate the syngas energy in the form of hydrogen-rich gas. The paper assess in details coal-based IGCC with calcium carbonate looping cycle used for power generation. Net power output is in the range of 550-600 MW with more than 95% carbon capture rate. Critical design and operation factors like process integration, heat and power integration, quality specification of captured CO2, stream were evaluated in details. The hydrogen and power co-generation scenario (in the range of 0-200 MW hydrogen) was also evaluated as a potential way to improve the plant flexibility. IGCC power plant without carbon capture was also considered to quantify the energy penalty for carbon capture cases. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.