The partnership is significant for two reasons. This is the first such agreement Nissan has made in Switzerland. Switzerland also happens to be Nissan's European headquarters. Not to mention that Energie Ouest Suisse produces 85% of its electricity through hydropower.
This website last reported Nissan's partnership with Monaco in late November. Since then, Nissan has also entered into an agreement with Sonoma County in California, bringing their total number of zero emissions partnerships to ten.
Source: Nissan Global, Image: Swiss World