Analysis of the energy efficiency potential of household lighting in Switzerland using a stock model

Lighting, a main focus of Swiss energy efficiency policy, is a substantial consumer of energy in the residential sector in Switzerland, requiring 4.1 PJ electricity in 2015 or 6.4% of the sector's total electricity demand. Currently, incandescent bulbs (sales were prohibited in 2014) and halogen bulbs (to be banned in 2018) jointly represent nearly 60% of the installed lighting capacity in Swiss households. In the past few years, the price of light emitting diodes (LEDs) dropped dramatically, offering largely unexploited opportunities for energy efficiency improvement. To assess the energy efficiency potential in household lighting, a dynamic model is developed that accounts for the change of the lighting stock per technology over time.