They may also include the positive or negative impacts of different power technology choices on the security of energy and electricity supply, employment and regional cohesion or on innovation and economic development. In principle, an assessment of the full costs of energy provision would integrate these three categories over the whole life cycle of electricity, i.e. from fuel extraction and conditioning, over construction, operations, generation, transport and distribution to decommissioning and waste disposal. Practical considerations will, of course, put a limit to the complete representation of all costs and suggest a concentration on the most important cost categories.