Hydrogen Electrolyzer & Fuel Cell Manufacturing calculator

Supplier Shortage Risk Calculator

Score the shortage risk of one critical stack supplier. Enter an impact-severity score (how badly a missed shipment would stop the line), an occurrence score (how often this supplier misses or comes close), and a detection score (how late in the part flow you would notice). The calculator returns a weighted risk score so you can rank suppliers consistently.

What this calculator does

  • Score the shortage risk of a critical hydrogen stack supplier (membrane, catalyst, bipolar plate, gas diffusion media, gasket) by weighting impact severity, the likelihood of an on-time miss, and the detection lead time before the line goes down.
  • Use it when a procurement lead or supply chain manager is prioritizing dual-source qualification across membranes, CCMs, bipolar plates, gas diffusion media, gaskets, and end plates and needs a comparable risk score.
  • It returns a weighted risk score for one supplier, ready to compare against other suppliers under the same rubric. A higher score means a higher hydrogen stack production risk and a stronger case for dual sourcing or safety stock.

Formula used

  • Weighted shortage risk score = severity × 0.40 + occurrence × 0.35 + detection × 0.25

Inputs explained

  • Impact severity if this supplier misses: Use 1 (no impact) to 10 (full line stop within a week). Membranes, CCMs, and bipolar plates often score 8 to 10 because they have no in-house substitute.
  • Occurrence likelihood (on-time miss frequency): Use 1 (no misses tracked) to 10 (frequent late or short shipments). Pull from the supplier OTD history.
  • Detection lead time before the line stops: Use 1 (caught at PO confirm or weekly forecast) to 10 (caught only at line-side incoming inspection or stack build).

How to use the result

  • Run it on the top 10 to 20 critical hydrogen stack suppliers each quarter, and after any line-stop event to recalibrate severity and occurrence.
  • Risk scoring is only as good as the rubric. Pair the score with the supplier scorecard, dual-source readiness, and inventory days-on-hand for a real sourcing decision.

Common questions

  • Why weight severity at 0.40? Severity is the dominant driver of supply continuity for hydrogen stacks because most critical components (membranes, CCMs, Ti or stainless plates, GDLs) cannot be cross-sourced overnight. The 0.40 / 0.35 / 0.25 weights match the standard risk rubric; do not change them or scores stop being comparable.
  • What scores trigger a sourcing action? A common rule is: weighted score above 7.0 requires a documented mitigation (dual source, buffer stock, alternate spec). Above 8.0 escalates to the program steering review.
  • How do I score detection for a long-lead PEM membrane? If the membrane lead time is 12 to 16 weeks and your PO-confirm visibility is weekly, score detection low (2 or 3). If you only catch the issue at the dock, score it 8 to 10.
  • Should I score the same supplier separately for each part? Yes. A bipolar plate supplier that ships both anode and cathode plates has different impact severity if only one part shorts. Score each part number separately and rank the list.

Last reviewed 2026-05-12.