Case studies

Setting and implementing an energy management policy has helped ANZ National Bank achieve significant energy savings.

Part of their energy management programme, evaluated the lighting used in their premises. Installing more efficient lighting tubes has created a direct energy saving worth around $50,000 a year. Further savings were achieved in electrical maintenance, where costs have dropped from $150,000 a year to around $10,000.

Clive Scouring in Napier is capturing heat previously released as waste and turning it into energy savings worth more than $100,000 a year.

Clive Scouring captures energy from its chimney and uses it to pre-heat water for other processes at the plant.

The project has a one-year pay back and on top of the energy savings, the new system has also cut the company's annual CO2 emissions by 516 tonnes.

After installing a permanent magnetic stirrer in their gas-fired furnace, the aluminium extrusion and fabrication manufacturer, MCK Metals is saving 6.8 per cent in gas energy consumption.

The permanent magnetic stirrer not only reduces the melting time required, it also increases the amount of aluminium melted per hour.

In addition to the energy savings, the stirrer delivers other benefits: its maintenance free, easy to operate, and has a large circulation capacity. It also reduces wastage and improves product quality.

The Chelsea sugar's new sugar purification process has reaped savings in labour, gas and water use and reduced discharges of wastewater, heat and air pollution.

The new process forces sugar liquor through granulated activated carbon in five 62 kilolitre pressurised stainless steel vessels, to remove impurities. It replaced a process that had remained almost unchanged for 120 years.

As a result, NZ Sugar had achieved 13% greenhosue gas emission reduction. The plant is repaying its $7 million cost in just 3.8 years.