HIOKI Launches 'ALDAS-E' EIS Measurement System to Support Evaluation of Large-Scale Water Electrolyzers and Fuel Cells

HIOKI (HIOKI E.E. CORPORATION: Ueda, Nagano; President and CEO: Takahiro Okazawa) will launch the 'ALDAS-E' EIS measurement system on March 27, 2026, designed for the evaluation of large-scale water electrolyzers and fuel cell systems, which are currently undergoing technological development for hydrogen energy utilization. ■ Development Background As global efforts to combat climate change accelerate, hydrogen is gaining attention as a key player in the energy transition. According to International Energy Agency (IEA) estimates, global hydrogen demand reached approximately 100 million tons in 2024 (*1), and demand continues to rise annually to achieve carbon neutrality. Hydrogen is expected to be utilized in a wide range of fields, including mobility, energy storage, and co-firing in thermal power generation (*2). Green hydrogen (*3), produced without carbon dioxide emissions, is essential for hydrogen utilization in the pursuit of carbon neutrality. To increase green hydrogen production, larger and more efficient water electrolyzers are necessary, which in turn requires methods to evaluate these large-scale systems. With the development of 'ALDAS-E,' HIOKI enables electrical measurements of large-scale electrolyzers operating under high current and high voltage—a task that was difficult with conventional methods—thereby supporting the early realization of a hydrogen society. *1 Global Hydrogen Review 2025 – Analysis, IEA *2 Co-firing: A technology that mixes hydrogen with fuel in thermal power generation to reduce carbon dioxide emissions. *3 Green Hydrogen: Hydrogen produced by the electrolysis of water using electricity derived from renewable energy sources such as solar and wind power. It emits no carbon dioxide during the production process. ■ Product Overview This product is a measuring instrument that performs impedance measurement using Electrochemical Impedance Spectroscopy (EIS). It targets electrolyzers and fuel cell systems using large cell stacks. By performing EIS measurements during actual operation with high current flow, it supports the discovery of optimal operating conditions and the estimation of internal states and degradation factors of the cell stacks. HIOKI has previously provided this product as a custom-made system to major domestic research institutions. With the official addition of 'ALDAS-E,' which supports demonstration and commercial stages, to the existing 'ALDAS-α' (for basic research) and 'ALDAS-Mini' (for applied development), we now provide a seamless performance evaluation solution using the same evaluation criteria from research through to commercial stages. ■ Key Features ・Enables measurement of MW (megawatt) class large-scale electrolyzers Previously, EIS measurement of large-scale electrolyzers at the demonstration and commercial levels was difficult. ALDAS-E supports stack voltages up to 1,000 V and electrolysis currents up to 10,000 A, allowing measurements even for electrolyzers in the hundreds of kW to MW class. ・Shortening of the evaluation cycle Commonly used electrochemical measuring instruments can take 30 minutes or more for a single EIS measurement. In contrast, ALDAS-E achieves a measurement time of approximately 7.6 minutes (*4) per measurement. This significant reduction in measurement time allows users to accelerate their measurement cycles.