[quote="Theology_Nerd, post:1, topic:342809"]
The bishop is the ordinary minister of the Sacrament of Confirmation. He can delegate his authority to a priest, who would then be the extraordinary minister.
QUESTION: When our retired Bishop administers confirmation, is he technically the ordinary or extraordinary minister of confirmation? ...
I think the first statement you make here is the answer. It is not the "diocesan bishop" or an "active" bishop who is the ordinary minister--the ordinary minister of confirmation is a bishop (see canon 882 of the Code of Canon Law). So, the retired bishop is an ordinary minister just as any active bishop is.
If you want to be precise, the bishop does not "delegate his authority" to a priest. In certain circumstances, he can grant the faculty to confirm to a priest. The power of holy orders enables a priest to confirm. This is clear in the Eastern Churches where priests routinely administer confirmation with no need for a faculty. In the Latin/Western Church, the law restricts the exercise of that power to confirm by requiring priests to have a faculty. In other words, all priests have the authority/ability to confirm. But, in the Latin Church, they can only use that authority when they also have the faculty.