Speaking to Windpower Monthly at EWEA 2014 in Barcelona, Kettwig said Enercon was happy to leave the offshore sector open to larger competitors.
The German manufacturer is well known for having eschewed the offshore sector, despite having developed one of the world's largest turbines, the E126 7.5MW.
Kettwig said: "We think that for a smaller company we can focus 100% on the onshore market, as we feel that the onshore market can be quicker.
"There's still a lot of space in the onshore market, some people are still living without onshore [wind] energy."
Kettwig said while there was a lot of sea to be exploited for wind power, there was also a lot of land. Enercon's aim is to focus the company's resources 100% on developing onshore products, he added.
This is likely to include the E101 and E115 turbines — Kettwig picked up a Windpower Monthly product of the year award for the E115 segmented blade.
However, Kettwig said there was unlikely to be an uprating of the E126 despite it being usurped as the biggest turbine in the world by the Vestas V164 earlier this year.
"A product must have a natural life cycle... blades are getting bigger very fast, but we feel that step-by-step progress is better," he said.