The department and the utilities company have formed a conservation partnership to address suspected falcon deaths by electric shock on overhead power lines in the Queenstown Lakes and Central Otago districts.
Four sites in Glenorchy have already been retrofitted with insulation, including several transformers and lightning arresters, removing the possibility
falcon's wings will bridge live wires and equipment.
The rare birds face a range of threats, including introduced predators, loss of habitat, illegal shooting and being killed by electric shock when landing and taking off from uninsulated power structures.
The move was applauded by Doc Southern South Island director of operations Allan Munn, who said Delta's ''pioneering'' efforts would address a long-standing issue across the country.
Delta chief executive Grady Cameron said his organisation was proud to be involved.
''Over time, we expect falcon safety will gradually improve as we retrofit hazardous structures in high risk locations across the Delta's network in Queenstown, Cromwell, Alexandra and Wanaka.
''Delta will label power poles that use the modified design as 'FalconSafe', to provide a lasting reminder to communities that falcon can now live and breed more safely. Any new installation will also be built to the new, falcon-safe design standard.
''We plan to share our developing knowledge on falcon safety with other electricity networks in the hope that other parts of the country can be made safer for the New Zealand falcon,'' Mr Cameron said.
Several falcon chicks have been released in the area in recent years, including siblings reared at Peregrine Winery, Gibbston, and released in late 2012 and early 2013.
More falcons were released by the winery last year.
The hope was for the birds to mate and help swell the falcon population in the area.
A fortnight ago another two eastern falcons were released at Maungawera, near Wanaka, having been transferred there from the national Bird of Prey Centre in Rotorua last month.
In the 1970s, the falcon's numbers declined because of the types of pesticides being used, which were ingested by the birds' prey.
There are fewer than 10,000 pairs now in New Zealand.
