Spain's 35 million voters are deciding whether to return the ruling Socialists to power in general elections.
Prime Minister Jose Luis Rodriguez Zapatero's party faces Mariano Rajoy's conservative Popular Party (PP).
At 1800 (1700 GMT), turnout was around 61%, only slightly lower than at the corresponding time during 2004's polls.
SUBSCRIBE AND FOLLOW
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements.Learn more