For them to legally come into your house, they would need police and a warrant. There is NO authority in an electric company.

By the way, it's most likely the electric companys meeter anyway.
Tell them to remove the meeter and install it outside. (they usually offer to move it upon request to avoid a lawsuit against them regarding a "I told you that meeter was in a dangerous spot near the drapes" so they get sued.

basically create a problem that makes the company move it to avoid a lawsuit.