CREATE TABLE table_27330 ("Region" TEXT, "Public network" TEXT, "Own/community generator" TEXT, "Solar panel" TEXT, "Other source" TEXT, "None" TEXT)

How many regions have 0.5% solar panels?
SELECT COUNT("Public network") FROM table_27330 WHERE "Solar panel" = '0.5%'
SELECT COUNT("Public network") FROM "table_27330" WHERE "Solar panel" = '0.5%'