Renewable deployment requires hydrogen storage decoupling production from demand, and metal hydride systems offer a safe, low-pressure, high-density option. Within the EU REMEDHYS project, a solid-state storage system based on an intermetallic alloy produced from recycled European metals is coupled to a 2 MW proton exchange membrane electrolyser. This paper presents a modular, equation-based Modelica model of the balance of plant of both subsystems, comprising eleven control loops, measured pressure-composition isotherms and a pseudo-twodimensional discretisation of the hydride bed. A 2 MW to 1 MW load step, a full absorption-desorption cycle, a sensitivity analysis and a coupled scenario feeding twenty cassettes are simulated. The hydrogen delivered per cycle falls from 4281 to 3292 g as the delivery pressure rises from 1 to 5 bar and doubles between 50 and 70 ◦C. Coupled to the electrolyser, a cassette charges in 6.6 h and stops discharging at a state of charge of 0.24, limited by the alloy equilibrium pressure.

Waste gasification is a promising thermochemical route for converting municipal solid waste and biomass into syngas for clean hydrogen production. This paper presents a Modelica-based dynamic model of the complete Balance of Plant (BoP) of the Hy2Rome Important Project of Common European Interest (IPCEI), focusing on three key contributions: (i) the integration of the gasifier Reduced Order Model (ROM), exported as a Functional Mock-up Unit (FMU), into the Modelica environment; (ii) the dynamic model of the Temperature Swing Adsorption (TSA) unit; and (iii) the dynamic model of the Pressure Swing Adsorption (PSA) system for final hydrogen purification. All BoP components were calibrated against Heat and Material (H&M) balance data, achieving acceptable relative errors. The PSA model implements a four-vessel, eight-step cycle delivering hydrogen at a nominal purity of 99.99 %, maintained during the adsorption steps at cyclic steady state. The TSA model operates a two-vessel thermal swing cycle between 40°C and 270°C with a PIDcontrolled state machine.