The HgasXMW product is a large electrolyser system built based on modules of three ITM Power stacks. Each 3-stack module is built on a skid frame suitable to be housed indoors and is rated ~2MW capacity at beginning of life. The number of 2MW modules in the system is scaled according to the hydrogen output or electrical input requirements of the customer. For example, a 10MW electrolyser system would be made up of five 2MW modules. Each 2MW module is able to operate independently of one another allowing for greater flexibility in load control and rolling maintenance. The 2MW modules are deployed alongside the vital sub-systems required for operation. Input water and output hydrogen purification options are available depending on specific requirements from the customer.