Siam Cement, Thailand’s largest industrial conglomerate, reported a 12 per cent drop in full year net profit Wednesday on the back of increased energy costs and a 35-day scheduled turnaround at its naphtha cracker plant. Weaker performance in SCC’s petrochemicals and paper businesses in 2005 dragged net profit down to Bt32.236 billion (US$827.5m), despite higher sales, which rose 13 per cent to Bt218.265 billion during the period, SCC said in a statement Wednesday.