MIDEAST STOCKS-Saudi Electricity weighs on Riyadh, Egypt pulls back

* Saudi Electricity drops on wider Q4 loss * Tasnee falls despite swinging to net profit * Bank Alinma up on Q4 earnings * Egypt's Global Telecom drops on Vimpelcom report * Blue chips support UAE markets By Celine Aswad DUBAI, Jan 18 (Reuters) - Shares in Saudi Electricity Co (SEC) weighed on Saudi Arabia's stock market on Wednesday after the company reported a wider net loss for the fourth quarter, while Egypt's index pulled back as local traders booked gains in blue chips. The Saudi equities