SMT PLT INADVERTENTLY PENETRATED RESTR AIRSPACE SURROUNDING THREE PWR PLANTS.

Narrative

I ALWAYS FILE IFR TO ENSURE THAT I DO NOT VIOLATE RESTR AIRSPACE. ON 11/SAT/01; APPROX AT XA00 TO XA45; I WANTED TO TEST THE RADIOS AND AUTOPLT. I FLEW FROM ZZZ1 ARPT TO THE ZZZ2 VOR THEN TO ZZZ3 VOR. I MADE SEVERAL TRIPS BETWEEN THESE TWO VORS TESTING THE VOR NAV; GPS; AND AUTOPLT. RETURNING TO ZZZ1 THE TWR ASKED ME TO CALL CTR; WHICH I DID; AND TALKED TO MR X WHO ADVISED ME THAT I HAD VIOLATED A PWR PLANT RESTR AIRSPACE. THE ONLY PWR PLANT IN THE AREA THAT I KNEW OF WAS ZZZ4. I HAVE LIVED IN THE AREA ALL OF MY LIFE AND DID NOT KNOW THAT THERE WERE THREE PWR PLANTS SO CLOSE TOGETHER. SEVERAL DAYS EARLIER I FLEW IFR. THERE WERE NO RESTRS AT THAT TIME. ONCE I WAS AWARE OF THE OTHER PWR PLANTS IN THE AREA; I MARKED THEM ON THE SECTIONAL CHART. AFTER THE SEPTEMBER WTC ATTACK; I OBTAINED ALL MATERIAL RELATING TO RESTR AREAS; INTERCEPTION PROCS; ETC. IF MAPS WITH THESE RESTR AREAS WERE HIGHLIGHTED AND SENT TO THE LOCAL ARPTS AND DISPLAYED; THIS INCIDENT WOULD NOT HAVE OCCURRED. THIS IS A SUGGESTION.