U.S. Wind to Hydrogen Modeling, Analysis, Testing, and Collaboration

• Break-in test Accomplishments: Test procedures - 500 hours of break-in operation Dynamic test 1. 24 hours/test 2. Take a polarization curve at fixed stack temperature 3. Hold at fixed current; avoid shutdowns/startups (keep BOP operation) 4. Perform 8 dynamic tests Break-in Test Dynamic Test Experimental testing to begin in May 2023 500 hours of unattended operation at STB1/STB2 Run 8 tests (wind speeds): 192 hours at minimum 24+ hours/test of unattended operation at STB1/STB2 Break-in Period Dynamic Exp. Polarization Hold NREL 10 Time

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