Pursuing Sustainability and Clean Energy at Earth Tools Inc.


Approaching net-zero electricity with 23 KW solar PV
Earth Tools has a 12 KW solar PV array on the roof of its main office and warehouse, installed in 2011 by Avery & Sun. In 2016, Earth Tools added an 11 KW ground-mount array, which provides a picnic pavilion and shades Warehouse #3. The combined 23 KW of solar PV enabled Earth Tools to generate more than 100% of its annual electricity needs in 2016. However, a shift from propane heat to high-efficiency heat pumps, along with business expansion, have increased electricity consumption and reduced the company’s “solar fraction” to 82%. The company has plans to expand its solar array in 2020 to return to net-zero electricity.
Energy Efficiency and Conservation


- Increasing attic insulation to R-60 above the office.
- Air sealing around the floor and ceiling perimeter using caulk and spray foam.
- Replacing propane space heaters and window air conditioners with high-efficiency mini-split heat pumps. By replacing propane space heaters with heat pumps our electricity usage has increased, but we’re able to supply the electrical demand with solar energy.
- The Metal Fabrication Shop was built using Structural Insulation Panels (SIPs), which provide a high insulation value and minimize air infiltration. The building is heated and cooled using mini-split heat pumps.
Water and Resource Conservation

