You can change it by following the steps below.
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Access Minna Denryoku My Page (https://portal.minden.co.jp/) and log in
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Click "MENU" in the top right of the top page
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Click "Confirm/Change Registration Details" in "Member Information" at the bottom of the page
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Click "Change" and enter your new email address in the "Email Address" and "Confirm Email Address" fields
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Click "Confirm" at the bottom of the page
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Check the details and click "Change" at the bottom of the page
*RFC-violating addresses that use consecutive dots".." or a dot ".@" immediately before the @ sign cannot be used.