The energy transition with its simultaneous move towards renewable energy generation and electrification of mobility and heating poses new congestion management challenges for grid operators across all voltage levels. However, at the same time, it also provides new sources of demand-side flexibility to grid operators, which can help to mitigate those challenges. Redispatch 3.0 aims to use the flexibility of such small-scale decentralised loads to complement the existing cost-based redispatch regimes in Germany with a voluntary, market-based approach; thereby, integrating new types of flexibility for congestion management. Battery electric vehicle (BEV) charging is a particularly relevant example of demand-side flexibility, as the charging can often be shifted in time while still fulfilling the required energy demand of the BEV. This paper is structured in two parts. In a first step, the main concepts and ideas behind the Redispatch 3.0 scheme are introduced. These include participants, such as flexibility service providers (FSPs), who aggregate the flexibility of their customers on an asset-level and participate at flexibility markets, grid operators, who require flexibility to ensure a stable energy system as well as the various processes from the first aggregation of flexibility over activation of redispatch potential to monitoring and ex-post validation. In a second step, a real-world pilot between the FSP Octopus Energy Germany and TransnetBW as the transmission system operator is presented and first results are discussed in detail.