Old House, Clean Power - Decarbonising a Historical Site
📸 Spotted in Tō Tātou Whakatū – Our Nelson (Issue 217).
In late 2024, the historic Melrose House in Nelson took a bold step toward a clean power future by eliminating its reliance on diesel for heating. With the help of Meridian Energy’s Community Decarbonisation Fund and leadership from Whirika’s Principal Energy and Carbon Specialist, Erin Roughton, the stately 19th-century home has transitioned to a clean, efficient electric heating system.
The Challenge:
Despite its serene, heritage-rich appearance, Melrose House had a hidden dependence on fossil fuels. Each year, the home consumed approximately 3,400 litres of diesel to power its water boiler for space heating. This not only incurred high operational costs but also resulted in the emission of 8,700 kg of CO₂ annually.
The Solution:
With funding secured by Melrose House Society Trust Chair Alan Winwood, the project team led by Erin Roughton developed and implemented a plan to replace the aging diesel system with an electric alternative. A high-efficiency 18kW electric heat pump was installed, providing a modern, low-emissions, and lower-cost solution for space heating - especially during the winter months. The project is part of a wider energy efficiency strategy for the property, which has already included upgrades like LED lighting installation.
The Impact:
Emissions Reduction: Annual CO₂ emissions cut by 8,700 kg
Cost Savings: Significant operational savings, especially during the colder months
Diesel Use Eliminated: 3,400 litres saved per year
Modernisation: Installation of a reliable, low-maintenance 18kW electric heat pump
Community Value: Greater comfort and sustainability for a much-loved public space
“This shift is a crucial step in reducing the house’s carbon footprint,” says Erin Roughton. “Melrose House is not just preserving its heritage—it’s paving the way for a cleaner, more resilient future.”
Melrose House’s decarbonisation journey showcases how heritage buildings can adapt to modern environmental standards without compromising their character. This project serves as a blueprint for similar properties seeking to blend historical preservation with forward-thinking energy solutions.