We derive the kinetic luminosity function for flat spectrum radio jets , using the empirical and theoretical scaling relation between jet power and radio core luminosity .
The normalization for this relation is derived from a sample of flat spectrum cores in galaxy clusters with jet-driven X-ray cavities .
The total integrated jet power at z = 0 is W _ { tot } \approx 3 \times 10 ^ { 40 } { ergs s ^ { -1 } Mpc ^ { -3 } } .
By integrating W _ { tot } over red-shift , we determine the total energy density deposited by jets as e _ { tot } \approx 2 \times 10 ^ { 58 } { ergs Mpc ^ { -3 } } .
Both W _ { tot } and e _ { tot } are dominated by low luminosity sources .
Comparing e _ { tot } to the local black hole mass density \rho _ { BH } gives an average jet production efficiency of \epsilon _ { jet } = e _ { jet } / \rho _ { BH } c ^ { 2 } \approx 3 \% .
Since black hole mass is accreted mainly during high luminosity states , \epsilon _ { jet } is likely much higher during low luminosity states .