DWIA said with the connection of Hofor's 20.7MW Korsnakke project in Lolland, Denmark's installed onshore wind capacity has surpassed the 4GW landmark, and is able to provide 27% of Denmark's electricity consumption.
According to the association, there are 4,187 turbines now installed on land, with an average age of approximately 19 years.
However, DWIA warned the support system for new wind projects expires in February 2018, and there is no replacement scheme currently in place.
"Wind turbines are the cheapest way for Denmark to switch to renewable energy, and in that light, we are pleased that the total amount of onshore winds now stands at 4GW," said DWIA CEO Jan Hylleberg
"On the other hand, it is highly regrettable and detrimental to the wind industry and the green transition that the government has not yet announced how it wishes for the future of wind turbine expansion will take place," Hylleberg added.
In February 2017, DWIA and the Danish wind turbine owners association issued a joint statement calling for a new system, recommending a tender-based scheme to help bring costs down.
Previously, Danish energy minister Lars Lilleholt has said the government intends to launch an energy policy in autumn 2017.
"It is unthinkable that we are in a situation where we will now actually see a stop in the construction of wind turbines.
"We risk losing momentum in the green transition, and the internationally-known green Danish [reputation] is blown simply because the government cannot agree on a new solution. I find it hard to come to mind other countries where you are thus gambling with their strengths," Hylleberg said.
"If the government and parliament do not make a solution that will enable the expansion of onshore wind in the future, we will soon fall below 4GW again.
"We expect that in the coming years we will decommission hundreds of wind turbines due to age, and of course it will require new wind turbines to replace the lost production capacity.
"The good news is that with a stable development up to 2030 we can get twice as much green power with half the wind turbines in the landscape. However, it requires a political decision on new framework conditions, " Hylleberg added.