Jon Vander Ark
President, Chief Executive Officer, Director at Republic Services
Thanks, Aaron. Good afternoon, everyone, and thank you for joining us. The Republic team finished the year strong by executing our strategy designed to profitably grow the business. We outpaced expectations throughout the year and deliver results that exceeded our full year guidance. During 2023, we achieved revenue growth of 11%, including 5% from acquisitions, generated adjusted EBITDA growth of 13%, expanded adjusted EBITDA margin by 60 basis points, including margin expansion in the underlying business of 100 basis points, reported adjusted earnings per share of $5.61, and produced $1.99 billion of adjusted free cash flow. We continue to believe that investing in value-creating acquisitions to further expand our business is the best use of our free cash flow. We invested $1.8 billion in acquisitions in 2023, including transactions in both the recycling and waste and environmental solutions businesses.
As part of our balanced approach to capital allocation, we returned $900 million to shareholders through dividends and share repurchases. The results we are generating are made possible by executing our strategy, supported by our differentiated capabilities. Regarding customers' zeal, our efforts to provide industry-leading service continues to drive sustained customer loyalty and organic growth in the business. Our customer retention rate remained high at over 94% and we continue to see favorable trends in our Net Promoter Score due to the value of our offerings and quality of our service delivery. We delivered outsized organic revenue growth during the fourth quarter with simultaneous increases in price and volume. Core price and related revenue was 8.8% and average yield on related revenue was 7.7%. Organic volume growth on related revenue was 40 basis points. Turning to our digital capabilities.
The team continued to advance the implementation of digital tools that improve the experience for both customers and employees. Development of our new asset management system is underway, which is expected to increase maintenance technician productivity and enhanced warranty recovery. We expect to begin utilizing the new system in late 2024. The continued operational enhancements supported by our RISE digital operations platform are expected to drive additional productivity through improved route optimization and safety performance and provide more predictable service delivery to our customers. We anticipate the RISE platform will drive approximately $100 million of total annual earnings contribution, of which approximately $65 million has been realized to date. We continue to implement advanced technology on recycling and waste collection routes. Our platform utilizes cameras to identify overfill containers and contamination in recycling containers. This technology is reducing contamination and driving incremental revenue. Moving on to sustainability.
We believe that our sustainability innovation investments in plastic circularity and renewable natural gas are a platform for profitable growth. Development of our polymer centers and Blue Polymers joint venture facilities remain on track. We are finalizing commissioning at our Las Vegas polymer center this week. Delivery of plastic flake to our offtake partners is expected in the coming weeks. Construction is progressing on our Indianapolis polymer center. This development will be co-located with Blue Polymers production facility and construction at the site is expected to be completed in late 2024. The renewable gas projects being codeveloped with our partners continue to advance. Five projects came online in 2023, and we expect at least eight additional projects to be completed in 2024. Efforts to support decarbonization, including our industry-leading commitment to fleet electrification. We currently have 11 electric collection vehicles in operation.
We expect more than 50 additional EVs will be added to our recycling and waste collection fleet in 2024. We have six facilities with commercial EV charging infrastructure with more than 40 additional sites in varying stages of development. As part of our approach to sustainability, we continue to strive to be a workplace with the best people from all backgrounds who wants to work. In 2023, employee engagement improved to a score of 86% with 90% -- 99% of employees participating in the survey. Turnover rates continued to churn lower with full year turnover improving 400 basis points compared to the prior year. As a result, we are better staffed to optimize our operations and capitalize on growth opportunities in the market. Our comprehensive sustainability performance continues to be widely recognized as Republic Services was deemed to the Dow Jones Sustainability Index for the eighth consecutive year.
Our 2023 results clearly demonstrate our ability to create sustainable value. And our ongoing investments strengthen the foundation from which we will continue to grow our business. With respect to 2024, we expect to deliver outsized profitable growth while continuing to make investments in the business to drive lasting value creation. More specifically, we expect full year revenue in a range of $16.1 billion to $16.2 billion. Adjusted EBITDA is expected to be in a range of $4.825 billion to $4.875 billion. We expect to deliver adjusted earnings per share in the range of $5.94 to $6, generate adjusted free cash flow in a range of $2.1 billion to $2.15 billion. Our pipeline supports continued acquisition activity in both recycling and waste and environmental solutions. We are targeting at least $500 million of investment in value-creating acquisitions in 2024. Our 2024 financial guidance includes the rollover contribution from acquisitions that closed in 2023.
I will now turn the call over to Brian, who will provide details on the quarter and year.