Greenpeace wants the government to pull the plug on its investment in the Ruataniwha Dam.

The Hawke's Bay Regional Council is considering a new report today, which reviews the regional economic impacts of the country's largest irrigation scheme.

Greenpeace's agriculture campaigner Genevieve Toop said the government will need to pour in hundreds of thousands of dollars to cover the funding short-fall, which is irresponsible.

She said it will probably bankrupt farmers, and add massive pollution.

The Butcher Report shows the total cost of the dam has jumped by $300 million to more than $900 million.

The report puts the price jump down to an increased irrigation zone as more pipes and pumps are needed.

It predicts the economic activity from the dam will create 3500 jobs and contribute $380 million to Hawke's Bay's GDP.