By Nicholas Earl Yu Group’s shares soared by nearly 10 per cent after the retail energy and water supplier told investors it expected to exceed annual guidance. Shares rose 9.72 per cent, with the FTSE AIM-All Share-listed company trading at 700p per share in this morning’s session. Yu’s surge in revenues has been powered by its digital offering, and follows four previous trading updates this year in which it upgraded performance expectations. The supplier said it had enjoyed strong organic growth, with full-year revenues now expected to exceed £275m – an increase of over 76 per cent on the pr…