Environmental evaluation of power transmission in Norway

► A life cycle assessment for the transmission of power in Norway is undertaken. ► Study includes: power lines, cables, transformers and substations installed by 2009. ► The transmission of 1 kW h of electricity in Norway generates 1.3-1.5 g CO2 eq. ► Overhead lines, transformers and SF6 losses cause most infrastructure impacts. ► A sensitivity analysis for different power mixes when modelling losses is performed.