The Danish government is yet to finalise an energy agreement, which would lay out how the country will deliver its "green transition" in the next decade, and the Danish parliament is now in its summer recess until October.
The lobby group said "extended political playtime" would create "unnecessary uncertainty".
"It is amazing that the entire political Denmark is talking about what a green future will create. Therefore, there is no reason for prolonged political playing time," said Lars Aagaard, CEO of Danish Energy.
"The sand in the hourglass is running out in relation to clarity of offshore wind, energy efficiency and taxes that can pave the way for the politically desired electrification of the heating sector.
"Without explanation, there are no investments. Without investments, Denmark will not be greener or richer," Aagaard added.
Dansk Energi claimed an offshore wind project will take five-to-six years to complete after government approval.
"If there are ambitions for more offshore wind on this side of 2025, politicians need to be seriously busy. The likelihood that we can commission a park by 2025 falls day by day," said Aagaard.
In April, reports surfaced of a potential 800MW project to be installed by 2024 being offered under the new agreement.