The purpose and focus of the Hydrogen Turbines project is to improve the ETI’s understanding of the economics of flexible power generation systems comprising hydrogen production (with CCS), intermediate hydrogen storage (e.g. in salt caverns) and flexible turbines, and to provide data on the potential economics and technical requirements of such technology to refine overall energy system modelling inputs.The final deliverable (D2) comprises eight separate components. This document is D2 WP1 Report – providing results of a techno-economic assessment of options for hydrogen power production from coal, coal/biomass and gas. It covers:Options for hydrogen productionTechno-economic definition of the selected hydrogen production optionsCharacterisation of basic design requirements for a cost effective hydrogen storeRequirements / options for hydrogen turbinesEconomics of hydrogen pipelinesEffects of hydrogen purity