How much power covers dumaguete central visayas region?
CREATE TABLE "table1_24418525_1" (
  "branding" text,
  "callsign" text,
  "frequency" text,
  "power_k_w" text,
  "coverage" text
);
SELECT COUNT("power_k_w") FROM "table1_24418525_1" WHERE "coverage"='Dumaguete Central Visayas Region';