In the absence of a personal recommendation, good references can offer you peace of mind. Of course, you may not need to ask your electrician for references. If they have a presence on social media you might be able to check their reviews for yourself. A Google search can also provide you with reviews depending on the way the company is listed.
If you do need to ask for references, make sure they are for the same type of project as yours so you can compare like with like.