Electrolysis waste heat utilization for district heating — A Norwegian case study

Hydrogen is expected to play a key role in future climate-neutral energy systems, with electrolysis emerging as a primary production method. However, approximately one-third of the electricity used in electrolysis is lost as heat, presenting an opportunity for district heating (DH) integration. This study explores the feasibility of utilizing waste heat from an alkaline electrolyzer facility in Bodø, Northern Norway, to supply an existing high-temperature DH network and a planned low-temperature network. Using techno-economic modeling and dynamic simulations, different integration strategies are evaluated, focusing on heat pump configurations and direct utilization options. Results indicate that integrating waste heat can significantly reduce energy costs for DH operators while improving the economic viability of hydrogen production. The study highlights the potential of sector coupling between hydrogen and district heating to enhance system efficiency and sustainability. • Waste heat reuse from electrolyzer explored for Bodø district heating in Norway. • Pre-heating heat exchanger boosts heat pump performance by up to 110%. • Selling waste heat may cut hydrogen production costs by up to 7%.