Can We Extract Energy from the Black Hole at the Center of the Milky Way?

My compatriot V. Toth on Quora usually answers questions thoroughly and very clearly...this is a rare one where he missed the bullseye.

https://qr.ae/pNScnG

I would have fixed it with a comment but VT disables them. What he wrote is good for everyone to know and it is all true but the key bits he missed are

If a Black Hole spins, we can extract energy from it, Penrose developed a process using the Ergosphere for how this is possible.

https://en.wikipedia.org/wiki/Ergosphere

Then the question is, does the BH at centre of our galaxy spin? Not easy to measure but seems it probably does, at a rate of no more than 10% the theoretical max spin of a BH

https://www.universetoday.com/148403/we-actually-dont-know-how-fast-the-milky-ways-supermassive-black-hole-is-spinning-but-might-be-a-way-to-find-out/

BH's can have 3 fundamental properties

1) Mass

2) Spin

3) Electric Charge

So this got me thinking, since Spin can be used as an energy source, can electric charge? I did a quick deep dive and it seems it can, though likely still needs Spin as well. This article below did the background research and explains very clearly

https://medium.com/predict/harvesting-energy-from-a-black-hole-b69e0044c28e

This could be a future energy source once we reach Kardashev III level!

https://youtu.be/n4JkaNJX-_U