Denmark's western electrical grid is part of the Synchronous grid of Continental Europe whereas the eastern part is connected to Sweden. 80% of electricity generated in Denmark comes from renewables (as of 2019). The most important source of electricity production is wind power (57%). Interconnectors to neighboring countries, in particular Norway which exports hydroelectricity and Sweden which exports mostly hydroelectricity and nuclear electricity, provide extra power when electricity consumption exceeds generation. The combination of domestic wind power and Norwegian hydroelectricity provides a stable source of renewable, non-biomass electricity (which would be harder to achieve on wind power alone, without energy storage).