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As matter enters the accretion disk it will rapidly turn into superheated plasma. I would expect this to coincide with lightning-like phenomena due to the electric potential difference between this outer edge of the accretion disk and the black hole itself.

The two concerns I have are the high electrical conductivity and turbulence of the accretion disk, which I imagine might be mitigating factors.

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    $\begingroup$ No, lighting happens because the charging occurs in a dielectric media. Plasmas are highly conductive to the point of being nearly infinitely conductive so charges don't really build up or last long if they do accumulate. $\endgroup$
    – honeste_vivere
    Commented Dec 7, 2023 at 21:07

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