The delivery of control reserve by fluctuating renewable energy sources (RES) generators will be important in an energy system with high RES penetration. This paper extends a previously introduced methodology to quantify the possible additional income of different pools of fluctuating RES generators in the negative secondary and tertiary control reserve market in Germany. The updated methodology allows concluding on the ideal market conditions by comparing different pool types and years. The development of the results over a long assessment period allows extrapolating the market value of the new market participants into the future. Results show a high dependency of the possible additional income on the overall market size and the market conditions and regulations.