They can contact the power plant that won't hire them without it, and ask them to allow your friend to come take the test. It is likely that the power plant will allow them to take the test, it's not an unheard of request. Of course, your friend will have to do it at a time that is convenient to the onsite proctors. Is there a site your friend is local to, so they don't have to drive across the country? You can contact their training department, or RP department and make the request.