In a small reshuffle of SGRE's top table, Nauen will take over from Hannibal from 1 November, while there has also been changes elsewhere.
Hannibal has been part of Siemens since 2004, having led the German manufacturer's offshore unit, prior to this year's merger with Gamesa, since 2014. Prior to that he led the offshore division in Europe, Middle East and Africa, and was head of offshore sales in 2004-2008.
SGRE said Hannibal decided to leave the company "by his own volition".
Andreas Nauen has a wealth of wind experience behind him, including 19 years at Siemens in 1991-2010. He led the integration of Bonus into Siemens in 2004-2005 as CEO of the wind division.
In 2010, he was appointed CEO of Senvion (then Repower), owned by Indian manufacturer Suzlon. He left Senvion in 2015, following its takeover by US private equity firm Centrebridge Partners.
Meanwhile, Miguel Angel Lopez has been appointed the group's chief financial officer (CFO) from the 1 December, replacing Andrew Hall. Lopez was previously CFO at Siemens' digital factory division.
Hall, former CFO of Siemens' wind division, pre-merger, joined the German group in 1995.
"Andrew Hall has throughout the merger process built and integrated a strong cross-cultural financial team and successfully integrated the financial structures and systems of the combined company by the closure of the first financial year. He has taken the decision to pursue other opportunities in the wake of this success," SGRE said.
Elsewhere in the group, Jose Antonio Cortajarena has left the company after ten years as general secretary and deputy secretary to the board of directors of Siemens Gamesa to "pursue new challenges".
Cortajarena will be replaced immediately by Juergen Bartl, who was SGRE business general counsel and is a 17-year veteran of Siemens.
As a result of the change, SGRE has moved its Capital Markets Day from 15 November to "mid-February", the company said. The firm was set to unveil its next three-year strategy at the Capital Markets Day.
Its full-year financial results will still be published on 6 November.
UPDATE: According to financial newswire Reuters, minority stakeholder in Siemens Gamesa, Iberdrola demanded changes at a board meeting on Friday (20 October).
The Spanish utility was concerned after the joint venture suffered two profit warnings in less than three months – the most recent coming last week, Reuters reported.