B737-300 CREW HAD THE #1 GENERATOR MEL'ED INOP. THE #2 GENERATOR TRIPPED OFF WITH A HIGH RISE TEMP. ONLY THE APU GENERATOR WAS OPERATING.

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WE WERE DISPATCHED WITH #1 GENERATOR INOP SO WE WERE RUNNING THE APU CONTINUOUSLY FOR OUR SECOND GENERATOR. THE #2 GENERATOR WAS WRITTEN UP FOR HAVING HIGH RISE TEMP COMING INTO SFO. THE MECHS DRAINED SOME CSD OIL OUT AND WE RAN THE ENG AT THE GATE AND THE GENERATOR WAS WITHIN ALL LIMITS. IN CRUISE; WE NOTICED THE RISE TEMP WAS IN THE YELLOW BAND AND CLBING. IT STABILIZED AT 29 DEGS C. WE TRIED CALLING DISPATCH THROUGH COMRDO BUT DISPATCH COULD NOT HEAR ME SPEAKING (I COULD HEAR HIM BUT IT WAS WEAK). SO I HAD COMRDO TELL HIM I WOULD ACARS HIM AND MAINT CTLR. WE SENT 2 MESSAGES TO MAINT CTLR REQUESTING INFO ON HOW LONG YOU CAN RUN IN THE YELLOW BAND. MAINT CTLR NEVER RESPONDED TO ANY OF OUR QUERIES. WE TRIED TO SHED AS MUCH ELECTRICAL LOAD THAT WE COULD (RECIRCULATION FAN; GALLEY PWR AND ONE FUEL PUMP ON #2). NO HELP. WE LOOKED AT THE CHKLIST REGARDING HIGH CSD OIL TEMP. THE CHKLIST DID NOT OFFER ANY GUIDANCE FOR OPERATING IN THE YELLOW BAND; IT ONLY PROVIDED A SOLUTION FOR THE HIGH OIL TEMP LIGHT ON (WHICH WE DID NOT HAVE). WE ALSO REFERRED TO THE ELECTRICAL CHAPTER TO DETERMINE OPERATING LIMITS. WE HAD NO HIGH OIL TEMP LIGHT SO WE LEFT THE GENERATOR RUNNING. WE WERE ABOUT MIDWAY BTWN RNO AND SLC WHEN THE GENERATOR DROPPED OFF LINE. WE SWITCHED THE AUTOPLT TO 'A' AND THE CAPT TOOK OVER AS THE PF. WE DECLARED AN EMER AND LOOKED AT THE CHKLIST FOR LOSS OF 1 BUS. WE THEN CHKED OUR OPTIONS OF AIRFIELDS. WE DECIDED TO CONTINUE TO SLC DUE TO GOOD WX; FAMILIARITY WITH THE FIELD; AND SUITABLE RWYS. WE THEN NOTIFIED DISPATCH. WE GAVE A CABIN ADVISORY TO THE FLT ATTENDANTS (WE DID THIS BEFORE WE DECLARED THE EMER). WE THEN FLEW AN UNEVENTFUL VISUAL APCH USING THE APU GENERATOR TO SUPPLY ALL ELECTRICAL NEEDS TO RWY 34R AT SLC. NO EQUIP OR OTHER SVCS WERE NEEDED. WE TAXIED TO THE GATE.