C182 Pilot reported losing electrical power with sky divers aboard after the alternator drive belt broke. The sky divers were able to jump and the pilot safely returned to the airport.

Narrative

Electrical system failure in flight: I positioned a Aircraft X from ZZZ1 to ZZZ2 for a Part 91 skydiving operation at the edge of the ZZZ2 Class D and under a ZZZ3 Class B shelf. Prior to the operations NOTAMs had been filed and I spoke with ZZZ TRACON about the plan; as well as advised ZZZ2 Tower of the operations that would be happening at the edge of their airspace. I departed with the jumpers; climbed to 2000 ft. MSL for a low pass to assess winds; and then climbed to 3500 ft. MSL. Shortly after departure I contacted ZZZ Approach on the radio; received a squawk; and had been identified on radar. During the climb to 3500 ft. MSL I lost my GPS/Comm 1 radio; then quickly lost my Comm 2 radio before I could switch over frequencies to that. The transponder also died before I could squawk XXXX. Each piece of equipment died quickly; one after the other. I continued to assess the situation while I circled overhead the drop zone as the jumpers prepared to jump. I called our company on the phone to help find a number for ZZZ2 Tower to let them know I was inbound NORDO. We were unable to find a Tower phone number so I called clearance delivery; the only ATC phone number for ZZZ2 in the iPad; to explain that I had a complete electrical failure and I asked for a relay to let ZZZ2 Tower know I was currently in a high right downwind for Runway XX. I had a moving map on my tablet using the iPad and was able to see other traffic on there; as well as visually acquire that traffic. I saw the traffic make a turn away from the area; which led me to assume that Tower had directed them out of the area to prioritize me. I did not look to see a light gun from the Tower at the time but did identify a fire truck near the runway intersection; which was another confirmation of my priority. The landing was uneventful and I taxied clear toward a FBO hangar and talked with the fire department personnel. Upon further inspection; I identified a broken belt on the alternator. The weather that day was going to be challenging with convective weather all around. The destination (ZZZ2) was experiencing strong thunderstorms about the time of my planned departure time; with only about an hour long flight. I decided to delay the departure about 30-45 minutes; but then I experience a thunderstorm at ZZZ1 when I wanted to depart. Ultimately; I was able to safely depart after the storm had passed and dissipated; and the positioning leg was uneventful; however; we were behind schedule. It was my first flight through the ZZZ3 Class Bravo so I flight planned quite extensively. This mitigation also helped with understanding the airspace in which we were operating and facilitated a safe landing at ZZZ2 after the electrical failure. There was a small amount of '-itis' to get the job done; especially with the weather delays; but I felt that weather hazards and external pressures were ultimately mitigated. In the event of another NORDO scenario; ensure that the Tower is providing the proper light gun signals before assuming it is safe to land.