Who bought Spartan Energy?

Could you please clarify who exactly purchased Spartan Energy? Was it an individual investor, a group of investors, or perhaps another company? Did the buyer have any prior experience in the energy sector or was this a new venture for them? Additionally, were there any notable reasons or motivations behind the acquisition? Lastly, how did the acquisition impact Spartan Energy's operations, and what can we expect from the company in the future?