You would put your share of the costs on form 5695, Line 1. There isn't a separate form for your share of qualifying off-site solar property that is used by you at your residence. Just be sure that you meet the requirements as outlined in the link shared in your initial post, and then treat your share of the expense as "qualified solar electric property costs" when answering TurboTax interviews or filling out the forms.
Qualified solar electric property isn't the same the same as qualified fuel cell property so don't answer the question on Line 7.
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