Case Study: Groen achieves historic local election gains with NationBuilder

Groen makes history in Belgian elections

Groen, the Dutch-speaking Green Party in Belgium, faced the challenge of scaling digital infrastructure and grassroots organizing to support hundreds of local campaigns and thousands of candidates while turning online interest into real-world votes. To do this they partnered with NationBuilder, using NationBuilder’s website, communications, people and field tools (with ecosystem partner Tectonica) to redesign their national site, launch local sites, and provide volunteers and staff with unified digital organizing tools.

Using NationBuilder, Groen relaunched more than 120 local websites quickly, trained volunteers on the platform, and deployed field and membership tools to organize outreach. The result was a historic election performance: Groen increased seats from 308 to 545 (about +75%), gained representation in 15 new locations for a total of 209 communities, captured 13.2% of the vote, mobilized roughly 400 active volunteers, and generated tens of thousands of online interactions—demonstrating measurable growth driven by NationBuilder-enabled digital and field infrastructure.

Groen

Jonas Dutordoir

Communications Director