"We can fund about 1.5 billion euros from our own funds, we could assume some debt which would bring it to about 2.5 billion," Rolf Martin Schmitz said at an energy conference in Berlin on Tuesday.

RWE, which last week said it had earmarked 1.5 billion euros per year to expand its renewables business, aims to add an annual 2-3 gigawatts of green energy capacity, Schmitz said.

($1 = 0.8805 euros)

(Reporting by Christoph Steitz, Vera Eckert and Tom Kaeckenhoff; Editing by Edward Taylor)