By Markus Wacket and Christoph Steitz BERLIN/FRANKFURT (Reuters) – Senior policymakers will hold talks with Germany’s top utilities over the country’s planned power plant strategy on Thursday, three people familiar with the matter said, the latest effort to make progress on the long-awaited piece of legislation. Earlier this week, talks between the Chancellor’s Office and the Finance and Economy ministries failed to produce a result, leaving the regulatory framework for around 15 gigawatt of full or partially gas-fired power plant capacity the country needs hanging in the balance. Stakeholders…