I have no experience with them, but I do know the guy calls often to speak with my boss.
But when I Googled them, I found some interesting links come up for Swan Energy that question the legitimacy of the securities they sell.
Like this one: http://swanenergyinc.blogspot.com/
Telemarketer
12
Mar 1, 2013
Does having a website make a company legitimate? Or just help give it the appearance of legitimacy?
Other
13
May 8, 2014
Some jerk that from Swan Energy keeps calling our office. He ask to speak to the owner and I asked him several times what this is regarding - he keeps saying a project - so I asked what type of project, he got frustrated and told me that it was above my pay grade and hung up on me. He works in a Boiler Room and I hope he goes to prison.