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 for its critical role in 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 in pursuit of 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).

To achieve carbon neutrality, 'green hydrogen' (*3), produced without CO2 emissions, is essential. Increasing green hydrogen production requires larger and more efficient water electrolyzers, which in turn necessitates methods to evaluate these large-scale systems. Through the development of 'ALDAS-E,' HIOKI enables electrical measurements of large electrolyzers operating under high current and high voltage—a feat 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 CO2 emissions.

*3 Green Hydrogen: Hydrogen produced by water electrolysis using electricity derived from renewable energy sources such as solar and wind power, emitting no CO2 during the production process.

■ Product Overview

This product is a measuring instrument that performs Electrochemical Impedance Spectroscopy (EIS). It targets electrolyzers and fuel cell systems using large cell stacks. By performing EIS measurements during actual operation under high current, it helps users explore optimal operating conditions and estimate the internal state and degradation factors of cell stacks.

HIOKI has previously provided this product as a custom-built 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), HIOKI now provides 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 for measurements of electrolyzers ranging from several hundred kW to the MW class.

・Shortened evaluation cycles

Commonly used electrochemical measuring instruments can take over 30 minutes 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.