Page 58 - 2022 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

Our Midlothian Cement facility
Midlothian, Texas

Initiatives to Reduce Our Carbon Despite these regulatory constraints, Martin Marietta views
Intensity the use of alternate fuels and improving fuel efficiency as
important components of our overall commitment to
Although our actual carbon emissions from clinker
sustainability, including climate change-related issues and
production may be comparable to or better than European
concerns. In this regard, in addition to significant plant
producers, their ability to calculate reportable CO 2 upgrades and other modernization in which we have
emissions differently leads, in part, to a seemingly lower
invested, our accomplishments include the following:
carbon intensity calculation.
Simply put, because U.S. producers are more heavily regulated • As noted in prior Sustainability Reports, we have made a
if they wish to use alternative fuels, and must report a greater significant investment in tire processing systems at our
amount of the related CO emissions from such fuels than Midlothian Cement Plant and are actively permitting
2
their European competitors, and must use a higher percentage adding additional equipment to our Hunter Cement
of clinker in domestic cement, carbon intensities are effectively Plant. In total between our two plants, tires made up 25
calculated differently for U.S. and European producers. We percent of our fuel mix in 2022.
believe that our track record of achieving comparably • In the last seven years, we have dramatically reduced the
favorable clinker intensities to European producers, despite key use of coal in our kiln fuel mixes at both cement plants
regulatory differences that give us fewer options for easily from almost 70 percent to 15 percent of our total fuel
reducing emissions through clinker substitution and alternative usage. In 2022 we actively engaged in a pipeline project
fuel use in the U.S., highlights our record of investing in our to obtain additional supplies of natural gas at Hunter as
plants and continually improving our processes. It further an alternative to coal use. We expect this project to be
underscores our continued dedication to sustainable practices completed in the first half of 2023.
in our operations.
• In late 2021, CALTRANS approved the use of Portland
Limestone Cement (PLC) Cement in its specification.
“Despite these regulatory constraints, TXDOT has also approved PLC in its standard
specification. Accordingly, by the end of 2022, we had
Martin Marietta views the use of converted approximately 90% of our Type I/II customers
alternate fuels and improving fuel to our new Type 1L at our two Texas plants. It is
estimated that PLC cement production may reduce GHG
efficiency as important components
emissions by up to 10 percent per ton of cement.
of our overall commitment to

sustainability, including climate
change-related issues and concerns.”

56 2022 SUSTAINABILITY REPORT