We study motion and collision of particles in the gravitational field of rotating black hole immersed in quintessential dark energy characterized with the quintessential parameter ω q ∈ ( − 1 ; − 1 / 3 ) $\omega_{q}\in(-1;-1/3)$ governing the equation of state of the dark energy, and the dimensionless quintessential field parameter c ˜ . We focus on the acceleration of particles due to collisional processes and show how the center of mass energy depends on the quintessential field parameter c ˜ . We also make comparison of the obtained results to the collisional energetics of quintessential static black holes demonstrating the crucial role of the rotation parameter a in the particle acceleration. Finally we study the dependence of the maximal value of the efficiency of energy extraction through Penrose process for rotating black hole with quintessential field parameter c ˜ . It is found that quintessence field decreases the energy extraction efficiency through Penrose process and when the parameter c ˜ vanishes one can get the standard value of the efficiency coefficient for the Kerr black hole as η ∼ 21 % .