A symposium to discuss the development of energy recovery linac technology as part of the future of high-energy physics. The symposium is open to particle, nuclear, accelerator physicists, experimentalists and theorists, engineers and further interested colleagues. Talks will be presented on ERL Facilities, key technical challenges (high current sources and SRF), energy frontier collider (ep and e+e-) prospects, applications for low energy physics and industry as well as on the ERL promises for power economy, innovation and sustainability.