Do you get your won electric bill from Eversource, NStar or whoever? If you do then you should be able to. Give it a try. The landlord should not care since it doesn't affect them. Also, the landlord will not be investigating every single electron to see who generated them so will never know. But if electricity is included in your rent then you aren't the utility's customer so you would not be able to sign up as far as I can figure.