Ooh yes. I think Moriarty probably has some large factory that's part of the heavy pollution in London of the era, which makes him oodles of money but also has the side benefit of sending out blasts of static electricity. Immortals either love it (they're own quickening can't be sensed, or at least isn't readily identified as such) or hate it (it feels like the city is full of immortals, all the time).

Amanda aka Irene is always frustrated by it. Methos thinks its wonderful until he discovers who created it.

Sadly, the factory broke all sorts of laws, so was shut down almost immediately after Moriarty's arrest.