  General relativity (GR) will be imminently challenged by upcoming experiments
in the strong gravity regime, including those testing the energy extraction
mechanisms for black holes. Motivated by this, we explore magnetospheric models
and black hole jet emissions in MOdified Gravity (MOG) scenarios. Specifically,
we construct new power emitting magnetospheres in a Kerr-MOG background which
are found to depend non-trivially on the MOG deformation parameter. This may
allow for high-precision tests of GR. In addition, a complete set of analytic
solutions for vacuum magnetic field configurations around static MOG black
holes are explicitly derived, and found to comprise exclusively Heun
polynomials.
