The hypothesis paper
New Control of Mitochondrial Membrane Potential and ROS Formation – A Hypothesis
mentions some factors which might flood mitochondria with Ca2+. Vasopressin gets a mention, again an excellent pressor drug for intractable hypotension, if you don't mind the calcium.
But of course the hormone we all want to ask about is insulin. So you go to Pubmed and search on "insulin calcium ROS"
which brings up this as pretty much the first hit
"The insulin-dependent Ca(2+) released from IP3R of skeletal muscle also promotes mitochondrial Ca(2+) uptake."
It does. Okay, slightly more interesting (and more thoroughly read) is this one:
Insulin enhances mitochondrial inner membrane potential and increases ATP levels through phosphoinositide 3-kinase in adult sensory neurons