A new law in South Dakota prohibiting the use of eminent domain to acquire land for carbon capture pipelines challenges the viability of a proposed project snaking through five Midwest states.

South Dakota Gov. Larry Rhoden signed a bill Thursday banning the use of eminent domain to build carbon dioxide pipelines, dealing a huge blow to developers of what’s been billed as the world’s largest CO2 storage and transportation network.

Iowa-based Summit Carbon Solutions awaits a decision from South Dakota regulators on its project to build a pipeline across five states.