ENTERING CLASS C AIRSPACE AT SAT; TX; A C150 PLT DEALS WITH ELECTRIC PWR FAILURE.

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WHILE ON AN ASSIGNED ALT OF 2500 FT MSL AND WHILE INSTRUCTED TO FLY DIRECT TO SAT; I SUFFERED WHAT WAS LATER DETERMINED TO BE A SUBSTANTIAL LOSS OF ELECTRICAL PWR AS A RESULT OF WHAT I BELIEVE MAY HAVE BEEN A FAILURE OF THE VOLTAGE REGULATOR. WHILE APCHING SAT; I VERY RAPIDLY LOST THE USE OF MY AUTOPLT; PRIMARY COM RADIO; RECEIVED ERRONEOUS INDICATIONS ON MY STORMSCOPE AND AUDIO BLEED-OVER ON THE ACFT AUDIO SPEAKER. MY INITIAL CONCERN WAS CTL OF THE ACFT. UPON INSURING THAT I HAD COMPLETE CTL OF THE ACFT AND DISENGAGING THE AUTOPLT; I TURNED DUE N INTENDING TO DEPART CLASS C AIRSPACE AS I HAD NO CLRNC TO LAND. ONCE EITHER CLR OF CLASS C AIRSPACE OR ON THE VERGE THEREOF; I RE-ESTABLISHED RADIO CONTACT WITH SAT APCH CTL AND CONFIRMED MY NEW DISCRETE XPONDER CODE (I HAD CURRENTLY SWITCHED TO 7600 TO INDICATE LOSS OF 2-WAY RADIO COMS). I THEN RECEIVED A SUBSEQUENT LNDG CLRNC. IN ADDITION; THE ASSISTANCE I RECEIVED FROM SAT APCH CTL WAS VERY HELPFUL; UNDERSTANDING OF MY PREDICAMENT AND; ABOVE ALL; EXTRAORDINARILY REASSURING. THE REMAINDER OF THE FLT WAS CONDUCTED SAFELY AND WITHOUT INCIDENT.