Southern Company is considering tapping external tax-equity investors to build its huge US renewables pipeline, potentially injecting significant new demand into the tax-equity market, as the utility giant grapples with the financial hangover left by its failed Kemper “clean coal” project.

In addition to the group of large regulated electric utilities it owns across the US South, Southern Company has emerged in recent years as one of the country’s most aggressive buyers of US wind and solar projects through its Southern Power unit, which generates and sells electricity on an unregulated basis.