ESSEN, Germany, Nov 15 (Reuters) - The value of RWE , which remains burdened by exposure to fossil-fuel based generation activities, will rise as part of a 50 billion euro ($57.2 billion) green energy push, its CEO told reporters, but dismissed calls for aggressive restructuring steps.

"The value increase, that some expect, will come either way. The question how fast it will come and which instrument is needed to achieve it," Markus Krebber told journalists during the group's capital markets day.

Activist energy fund ENKRAFT in September said RWE should separate its lignite activities to cut emissions, sharpen its focus on renewables and raise value. RWE's EV/EBITDA ratio stands at less than half that of Denmark's Orsted.

"And what I find annoying in this discussion is that some believe that this can happen overnight or with brute force, because we are talking about employees, we are talking about social commitments." ($1 = 0.8744 euros) (Reporting by Christoph Steitz Editing by Riham Alkousaa)