Power joined the Tranmere Rovers youth set-up at the age of eight and has captained the club at every age group except the first team. A former student at Wirral Grammar School for Boys, after impressing in the Tranmere Rovers Reserve team he was awarded a professional contract in May 2011. Manager Les Parry was confident Power had a bright future in the game, but warned the youngster about his aggression. He compared him to Joss Labadie, another young and talented Rovers midfielder with a reputation as a hothead. Power made his first team debut in the Football League Trophy clash with Port Vale on 30 August 2011; he replaced Andy Robinson on 66 minutes before he went on to score a penalty in the shoot-out victory. He scored his first goal for the club on 13 November, in a 3–0 win against Braintree Town in the FA Cup. He scored his first league goal for the club on 26 December, in a 2–1 win against Crewe Alexandra. On 23 February 2013, he scored his second league goal for the club in a 5–1 win away to Colchester United. On 4 March, he extended his contract, keeping him at the club until June 2015.