Continuing to focus on a more sustainable environment clearly provides us with a higher purpose and is one of the most important ways Day & Zimmermann can have an impact on helping future generations thrive.
As a responsible corporate citizen, it is our duty to make a difference in our communities and to preserve our planet for future generations. At Day & Zimmermann, we know that our business and the economy can thrive best when we prioritize environmental stewardship and continuously innovate more sustainable solutions that engage our customers and employees.
Day & Zimmermann works with major utility companies to reduce their impact on the environment and comply with regulatory requirements. Nuclear power represents a proven form of clean energy, and Day & Zimmermann has a footprint at more than 50 percent of the U.S. nuclear fleet. We have also supported dozens of customers in following the guidelines of the Clean Air Act by converting coal-fired industrial boilers to cleaner burning natural gas.
Our dedicated Architecture & Engineering Practice and Energy & Sustainability Services are working to improve the efficiency, sustainability and resiliency of buildings through creative design, advanced simulation and robust commissioning. Since 2008, our new design and retrofit projects have saved more than 300 million kilowatt-hours of energy and 60 million liters of water compared to business-as-usual design and operation. These savings have resulted in a cumulative reduction of more than 230,000 metric tons of greenhouse gas emissions. We are working to advance distributed energy generation through combined heat and power plants, and we have incorporated more than 15 megawatts of photovoltaic and solar thermal renewable energy systems into our designs in recent years. We support green-building rating systems and have more than 40 Leadership in Energy and Environmental Design (LEED)-certified projects with an additional 25 projects pending certification.
Additionally, environmentally friendly ammunition disposal has been an ongoing focus of global communities with interest in postconflict ammunition stockpile destruction worldwide. Climate change has caused U.S. lake shorelines to recede, uncovering the risk of potentially harmful contaminants in formerly active ranges used by the military for ordnance testing. We continue to work with the Department of Defense to safely remove material potentially presenting explosive hazard and munitions and explosives of concern. At our Lone Star and Kansas munitions facilities, changes to production methods have been evaluated and implemented to eliminate or minimize hazardous waste materials or the generation of them by changing the process, substituting materials, or converting or fixating hazardous waste materials so that they no longer exhibit a hazardous quality.
Continuing to focus on a more sustainable environment clearly provides us with a higher purpose and is one of the most important ways Day & Zimmermann can have an impact on helping future generations thrive. Our sustainability efforts are rooted in our promise — “We do what we say®” — as well as our company values. By championing a sustainability mindset, we gain competitive advantage, delight our customers and protect our planet.