John Vander
Chief Executive Officer at Republic Services
Thanks, Aaron. Good afternoon, everyone, and thank you for joining us. We started the year strong and are pleased with our first quarter results. Our performance reflects our ability to grow across our business while enhancing profitability. We remain well positioned to capitalize on additional growth opportunities in the marketplace by providing the most complete set of products and services to customers.
During the quarter, we delivered revenue growth of 21%, including 11% from acquisitions, generated adjusted earnings per share of $1.24 and produced $496 million of adjusted free cash flow. We continue to believe that investing in acquisitions is the best use of free cash flow to create long-term value. We invested $224 million in acquisitions during the first quarter. All transactions were in the recycling and solid waste space. Our acquisition pipeline remains supportive of outsized levels of activity in both recycling and solid waste, and environmental solutions businesses. We continue to see opportunity for well over $500 million of investment in value-creating acquisitions in 2023.
We are making great progress on the integration of US Ecology and increasing the profitability of our Environmental Solutions business. We continue to adjust prices, to earn an appropriate return on the valuable services we provide. The acceptance of our pricing actions remains high, with very little customer defection. Cross-selling our complete set of products and services continued to run ahead of plan, with more than $60 million in new sales today. We have now achieved of $40 million of annualized cost service. As a result of actions taken in the Environmental Solutions business, EBITDA margin improved to just over 20% during the first quarter. We continue to generate outsized growth by executing our strategy, supported by our differentiating capabilities, customer zeal, digital and sustainability.
Regarding customers' yield, we remain laser-focused on providing a world-class customer experience to drive increased loyalty and organic growth. Our customer retention rate remained at 94%. We continue to see positive trends in our Net Promoter Score, supported by improved service delivery. Our front-line colleagues, including drivers, technicians and the customer experience team are determined to fulfill our daily commitments to our customers. We delivered robust organic revenue growth during the quarter and simultaneously increased in both price and volume. For price and related revenue increased to 9.3% and average yield on related revenue increased to 7.4%. Organic volume growth on related revenue was 1.8%. Volume growth was broad based across our market verticals and geographies. Turning to digital, we continue to make progress on deploying rise tablets in our collection business. Over 75% of our residential routes are operating with rise tablets. The remaining routes are on track to be completed by mid year. This technology is the foundation that will allow us to further enhance our digital service offerings and improve our customer's experience.
Moving on to sustainability, we are investing in differentiated capabilities to leverage sustainability as a platform for profitable growth. In February, we announced our plans to significantly scale our electric fleet through our long term agreement with Oshkosh. We will begin operating two fully integrated electric recycling and solid waste collection prototypes later this year, and expect to start buying at scale in 2025. This announcement supports our industry leading commitment to fleet electrification through a multi supplier strategy.
Development of our polymer centers in Las Vegas and the Midwest remain on track, with the centers becoming operational in late 2023 and late 2024, respectively. The 57 renewable natural gas projects being co-developed with our partners are advancing. We expect at least six of these projects to commence operations this year. Our approach to sustainability includes our aspiration to be the employer of choice in the markets that we serve, and we are seeing positive results. Turnover rates continue to improve and we are now below 2019 levels. As a result, we are better staffed to capitalize on growth opportunities in the market.
We continue to be widely recognized for our comprehensive sustainability performance. For example, we recently named to Barron's 100 most sustainable Companies list, Ethisphere's world's most ethical companies list and Fortune's list of the world's most admired companies.
A positive momentum in our business continues to build, as we harness the power of our differentiated capabilities. We will continue to invest for the future profitable growth to deliver the results that creates unmistakable value for our stakeholders.
I will now turn the call over to Brian, who will provide financial details for the quarter.