The business use limits the credit allowed despite the utilities being included. Residential Clean Energy Credit | Internal Revenue Service addresses your issue. It states:
If you use your home partly for business, the maximum available credit for eligible clean energy expenses is as follows:
- Business use up to 20%: full credit
- Business use more than 20%: credit based on share of expenses allocable to nonbusiness use
Find more on who can claim the credit.
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