The treatment as Other Income on line 21 presumes that you are not engaged in a trade or business and thus the income is not subject to self-employment tax. Implicit in this assumption is that your electrical generation equipment is for personal use, and the associated expenses are not deductible.
If instead, you were to consider yourself engaged in a business of selling electricity at a profit, you would file a Schedule C, and report your income and expenses associated with the business. If the business generates income, it will be subject to self-employment tax.
Note that the business of generating electricity for sale may be regulated by state or federal laws.
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