Developers and investors have frozen or dramatically slowed down $6bn in new US wind project deals in their pipelines in reaction to Republican efforts in the House of Representatives to scale back the production tax credit (PTC), according to the American Wind Energy Association (AWEA).

The trade group did not name the projects or the developers and investors, but said the amount is in addition to $50bn in earlier announced investment now at risk from language in a House bill to reform and modernize the US tax code.