DSO’s are facing significant challenges in network planning due to the integration of DER, Smart Grid technologies, E-Mobility, regulation and volatile market conditions. In previous work it was shown (A) how DSO’s are able to optimize planning of network assets in the presence of high uncertainty [1] and (B) how to describe the interdependencies between all market participants in an agent-based fashion to derive forecasts of prices, generation & demand [3]. Here the integration of these solutions across all voltage levels by means of long-term network planning is presented. Thereby smart grid components extend the traditional grid planning process. This extension merges time-series based network planning approaches with models of active and reactive innovative network participants. This results in robust and future-proofed network planning.