The European Union’s vision of a single energy market will move a step closer on Tuesday with the start of a joint market for electricity delivered on the same day. The project, which requires close cooperation between rival exchanges and grid operators, will link 14 national markets from Latvia to Germany and Portugal. Most other European countries are scheduled to join next summer. The markets will be treated as one zone with the power bought and sold between traders in the same way as within a country — as long as the necessary international transmission capacity is available. Bloomberg