Page 73 - 2023 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

Adding solar panels allowed Jones Mill and Hatton to join the ranks of other Martin Marietta sites that use renewable
energy to power parts of their operations. Shell said solar power is an excellent renewable resource in Arkansas, a state
that belongs to the Unites States’ Sun Belt.

“We have low, flat land here in Arkansas, so using the sun exposure just makes sense,” he said. “This is a great natural
resource.”
The results have been significant. Shell said that since the installation of the solar panels, the District estimates it has been
able to reduce its carbon dioxide emissions by 200 tons, which is equivalent to planting about 1,400 trees.

“Martin Marietta is used to setting industry standards,” he said. “We have done it with safety and have become one of
the safest companies out there. Now, we can hopefully look toward becoming one of the greenest companies in the
industry by continuing to find new and innovative ways to reduce our carbon footprint.”

A Leaner, Cleaner Plant at Eden Prairie

With an eye toward improved efficiency and a reduced carbon footprint, the team at Eden Prairie Asphalt in Minnesota
has transitioned to a new continuous flow plant that is providing consistent energy savings.
The original batch plant, built in the 1960’s, consumed 3.16 kWh per ton of asphalt produced. Today, the site’s new plant
consumes just 1.91 kWh per ton, which is having a substantial impact on the plant’s overall sustainability. In 2023, for
example, the site achieved a total estimated energy savings of 425,000 kWh, or enough energy to power 30-35 average
Minnesota homes for a full year.
Site leaders said the 39.6% reduction in energy consumption can be attributed, in large part, to the newly installed
variable frequency drives (VFD), which reduce overall power usage by modifying the voltage and frequency of the power
supply according to need, as well as an updated, more efficient operating system.

In addition to energy savings, the technology and infrastructure of the new plant has allowed the Eden Prairie team to
reduce its GHG emissions per ton produced by 10%. Filterable particulate matter (PM) emissions per ton produced were
also reduced by 80%, according to recent compliance tests.

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