This document discusses access to reliable energy data for developing sustainable energy action plans (SEAPs). It summarizes the Meshartility project, which aimed to facilitate cooperation agreements between municipalities and utilities to share energy data. Through bilateral and some national/regional agreements, the project established 14 local agreements and 4 national agreements to support 73 SEAPs and over 140 implemented low-carbon actions. However, it did not establish a European cooperation framework or formalize agreements in all countries involved.