Water will be costly and difficult to fix, says Guy Salmon, executive director of the policy think-tank Ecologic and a driving force behind the Land and Water Forum.
Central Hawke's Bay electrical and pumping business Isaacs Pumping & Electrical has been developing the technology over the last two years with support from Callaghan Innovation.
Isaacs Electrical directors Gavin Streeter and Shane Heaton were continually being asked by farmers what options were available to reliably get water to stock without electricity, especially in remote hill country properties.
"Solar was the ideal alternative but we needed to ensure we had a motor and pump that farmers could rely on to keep stock troughs full," says Streeter.
"We didn't need to look too far and we selected a pump with a proven track record and have been servicing farms for over 50 years."
The Callaghan Innovation funding helped developed the controller or the "brain", which is a circuit board that optimises the use of solar power and monitors water pressure, run times and faults logs.
"The system is fully automatic, it operates like a standard pumping system and we have just design some clever features to maximise the pumping time and protect the motor," he says.
The development of the epump has been a mix of international and Hawke's Bay suppliers providing equipment and componentry.
An Italian company developed the industrial continuous rated motor, Hawke's Bay engineering firm McLaren Stainless designed and manufactured the outer protective shell and another local firm, some of the Intellectually Protected circuitry.
The epump can pump up to 120m of head and up to 20 litres per minute in daylight hours and can withstand the harshest environments. It can fill stock troughs on hillsides up to 120m on hill country and unlike other options it can draw both clean and dirty water.
"We're using the sun's energy to drive the pump. We can deliver water to parts of the farm where it's never been seen before."
Streeter says they have ramped up production due to farmers preparing for El Nino drought conditions while we have interest from a South African company that supports community aid projects.
"We see significant export potential for the epump but presently we have been inundated with farmer interest, which we're now fulfilling," he says.