There's nothing like charging your customers more to boost your shareholders' portfolios, so the utility sector is going well after British Gas owner Centrica said it will raise householders' gas and electricity bills by an average of 7% from 10 December.Mining stocks have given up a recent strong run as metals prices retreat.Sector big hitters such as Antofagasta, Kazakhmys and Xstrata are holding the FTSE 100 back. Top performing sectors so far todayGas, Water & Multiutilities 4,709.13 +1.56%Forestry & Paper 5,381.37 +1.38%Food & Drug Retailers 4,815.03 +1.33%Aerospace and Defence 3,303.31 +1.23%Electronic & Electrical Equipment 2,493.22 +1.23%Bottom performing sectors so far todayMining 26,070.13 -1.69%Household Goods & Home Construction 6,394.14 -1.07%Industrial Metals & Mining 7,787.06 -1.07%Software & Computer Services 653.35 -1.06%Technology Hardware & Equipment 542.13 -1.04%