When twin power outages knocked out power to more than 670 million people in northern India early this week, officials were quick to blame a chronic energy gap that hobbles the fast-growing economy. Energy analysts see India as a powerhouse market for coal and natural gas with power use slated to continue on its steep upward trajectory as the middle class plugs in air conditioners and starts up newly made cars and gadgets. But this week's blackout points to deep-rooted problems that a long series of government programs and reforms has failed to address.