Report Highlights

Before You Commit Capital: The Questions That Must Be Answered

The electrolyser BOP market requires clarity on three questions before investment. First, what fraction of total electrolyser system cost is BOP versus stack? At MW scale, electrolyser stacks represent approximately 35%–50% of total installed system cost, with power electronics (AC/DC rectifiers, grid integration), gas purification and drying, water treatment and deionisation, compression systems, and civil and mechanical infrastructure accounting for the remaining 50%–65%. This split means BOP suppliers capture a larger share of project economics than stack manufacturers at current market dynamics — yet BOP receives far less investment attention and technology development focus. Second, what is the BOP cost reduction trajectory, and which components have the most learning curve potential? Power electronics costs are declining with EV power electronics scale manufacturing; gas compression costs follow established industrial compressor learning curves; water treatment costs are mature. The BOP learning curve is more modest than stack learning curves but provides a more predictable, lower-risk cost reduction pathway. Third, how does electrolyser technology choice affect BOP requirements — PEM versus alkaline systems require different power electronics architectures, water treatment standards, and gas purification approaches, creating platform-specific BOP supply chains.

The Drivers That Create Entry Windows

Green hydrogen project pipeline growth is the primary driver — announced global electrolyser project capacity reached 750 GW by 2030 (across all announced projects), and even assuming 80% attrition to final investment decision, the 150 GW of likely deployed capacity by 2030 implies USD 15–25 billion of BOP procurement. Power electronics for electrolyser grid integration is growing in parallel with grid-scale battery storage power electronics — the same AC/DC conversion, grid synchronisation, and power quality management technology serving battery storage can be adapted for electrolyser applications, allowing power electronics manufacturers including ABB, Siemens, and Schneider Electric to leverage existing capability. Water quality management requirements for PEM electrolysers — requiring ultra-pure water below 1 µS/cm conductivity — create demand for industrial water treatment equipment that established water technology companies (Veolia, Suez, Evoqua) are well-positioned to supply, providing a capital-light market entry through existing product lines rather than new technology development.

The Barriers That Determine Who Can Compete

Electrolyser project attrition is the primary commercial risk — the gap between announced electrolyser project capacity and actual FID (Final Investment Decision) has been dramatic, with less than 5% of 2020–2023 announced projects reaching construction start by 2025. BOP suppliers who build capacity anticipating headline project announcements face stranded capital risk if project timelines slip or cancel — which most industry analysts now expect for 60%–80% of announced project capacity. The system integration requirement — BOP components must be engineered as an integrated system matched to the specific electrolyser stack technology and project conditions — creates engineering complexity that commodity BOP suppliers cannot serve without electrolyser application expertise, favouring vertically integrated electrolyser manufacturers who supply complete systems over BOP component specialists. Chinese electrolyser manufacturers are entering the international market with complete system offerings at 40%–50% lower cost than European and US competitors, including BOP integration, creating procurement competition that pressures margins for Western BOP specialists.

Market at a Glance

Where to Enter, Where to Watch, Where to Wait

Power electronics for electrolyser grid integration is the segment to enter — leveraging existing industrial rectifier and power conversion manufacturing capability adapted for electrolyser-specific grid codes and operational profiles, with market entry requiring adaptation rather than fundamental technology development. Gas compression for hydrogen at 30–350 bar is the segment to watch — hydrogen-specific compressor materials (hydrogen embrittlement-resistant alloys), sealing technology, and operational reliability at the 30+ million start-stop cycles that variable renewable-powered electrolysers experience create a specialty compressor market that general industrial compressor manufacturers are adapting to from established product lines. Large-scale water deionisation system supply for multi-GW electrolyser installations is the segment to wait on, as the majority of GW-scale electrolyser projects have not yet reached construction — the market opportunity is real but the timeline is 2028–2032 for the procurement volumes that justify dedicated manufacturing capacity investment.

Who Is Winning, Who Is Vulnerable, and Why

Nel Hydrogen is winning in integrated BOP supply through its H2Station and containerised electrolyser system approach, which packages stack and BOP into tested, pre-certified modular units that reduce project integration risk for buyers. Siemens Energy is winning in large-scale BOP engineering through its project execution capability for multi-hundred-MW electrolyser installations, leveraging its power electronics and hydrogen technology divisions. Thyssenkrupp Nucera is vulnerable — its alkaline electrolyser technology has strong cost economics but its business model has been under financial pressure, and its dependence on large FID-stage projects creates revenue volatility linked to the project attrition dynamics that have slowed the entire green hydrogen sector.

Common Misconceptions About This Market

The most consequential misconception is that electrolyser cost reduction is primarily a stack technology problem — in reality, BOP components represent 50%–65% of system cost at installed project level, and the stack cost reductions achieved through manufacturing scale must be matched by equivalent BOP cost reductions to achieve the system levelised cost targets that make green hydrogen competitive. The second misconception is that electrolyser system integration is straightforward — the dynamic power input profile from variable renewable energy requires power electronics and control systems designed specifically for electrolyser partial-load operation, not the steady-state operation profile that conventional industrial electrolyser equipment was designed for, creating engineering complexity that increases BOP cost and development lead time for renewable-powered installations.