GTM Squared delivers premium content in the form of in-depth article series, research highlights, and multimedia extras. Go beyond our everyday coverage and gain insider access to our experts. Indiana’s Nipsco is the latest Midwestern utility to plan significant coal retirements alongside a big build-out of renewables. In the early days of the U.S. solar market, development was largely focused on the coasts, clustering in sunny climes or in states like California that had incentives to sweeten the deal for developers and utilities. As the industry matures, though, installations are cropping up on new turf.