The federal government has $8 billion to spend to kick-start construction of the first ​“clean hydrogen hubs” in the U.S. — and competition for that funding is heating up. At congressional hearings this month, a number of senators and representatives from both parties pitched their home states as the ideal sites.

But questions are mounting about how to choose the best locations for centralizing production, storage and delivery of hydrogen as a low-carbon replacement for fossil fuels.

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