John Morris
Executive Vice President and Chief Operating Officer at Waste Management
Thanks, Jim, and good morning. In the first quarter, operating expenses as a percentage of revenue improved 210 basis points year-over-year to 60.9%, continuing the positive trend of our disciplined management of operating costs, particularly in our collection business. Through strategic investments in innovative solutions and process optimization, we delivered improvements in operational efficiency, extracted costs, and setting a new standard for managing the middle of the P&L.
Combining this strong operating expense performance with the disciplined pricing performance Jim described, we greatly enhanced overall operating EBITDA margins. In the first quarter, operating EBITDA in our collection and disposal business grew $212 million, and margin expanded 310 basis points to 36.6%.
As we continue our journey of automation and optimization, we remain committed to harnessing the power of technology to drive sustainable growth, further reduce costs and improve profitability. In the first quarter of 2024, our continued adoption of technology and automation initiatives led to substantial reductions in both labor costs and repair and maintenance expenses.
On the labor front, efficiency in all three of our collection lines of business improved meaningfully from the first quarter of 2023 as our implementation continues to gain traction. As an example, we're seeing nice improvements in performance from our routing efficiency program, next day optimization, or NDO, in our industrial line of business.
This tool allows us to more dynamically route and it improves our efficiency, which is reducing our cost to serve and improving our asset planning. Currently, we have deployed NDO at 92% of our collection sites, and the majority of those are already achieving or exceeding efficiency targets.
Additionally, we are achieving great results in the automation of our residential routes. Through Q1, we have automated over 650 routes and removed almost 800 rear load trucks since 2022. This has led to upwards of a 30% efficiency gain and residential EBITDA margins approaching 20%.
The integration of these technology investments, coupled with the benefits of improved driver retention have resulted in a 135 basis point improvement in labor costs as a percentage of revenue. In the first quarter of 2024, driver turnover improved to about 18%, down from over 22% a year ago. We expect ongoing benefits from continued moderation inflation as well as the investments we're making in our people and processes as we progress through the year.
Turning to repair and maintenance. In the first quarter, repair and maintenance spending decreased year-over-year for the first time in several years, and spending as a percentage of revenue improved 50 basis points. In addition to our strong process discipline, we are also leveraging technology to reduce these costs.
These technologies have enabled us to digitize much of our workflow, beginning with all of our technicians who now have portable technology in their hands. These tools facilitate our ability to assign and track work, drive technician efficiency, reduce downtime, and improve asset utilization. Our results are encouraging, and we see further runway to optimize repair and maintenance costs in the future.
In addition to great operating cost performance, we continued to deliver top line growth primarily through disciplined execution on our pricing programs. Our customer lifetime value model continues to drive strong organic revenue growth, and our sales metrics in the quarter are a clear indication of our success in profitably growing the collection and disposal business.
Churn was near the lowest rate that we've ever seen at 8.5%. New business improved 16% and continues to outpace lost business. Rollbacks remain in the low-double-digits. Net service increases remained positive, and our net promoter score improved by almost 12% year-over-year.
Looking at revenue growth, as Jim said, we've seen a strong start to the year in pricing. Volume has been relatively consistent with our original expectations, with the exception of our temporary roll-off business. The softness in this volume category reflects some slowness in the homebuilding and industrial segments of the macro economy.
C&D was also impacted with the lapping of volumes related to Hurricane Ian cleanup last year. With that said our two bellwethers for demand, commercial collection and MSW volumes were positive in the quarter, and we also experienced a nice up-tick in special waste tons in the quarter.
For the full year, we now expect total revenue growth of between 5% and 5.75%. The revision from our prior expectation is driven by two things: the softer temporary roll-off volumes mentioned; and a lower outlook for energy surcharge revenue, given the decline in the average diesel cost relative to our expectations.
Our pricing remains on track, and in some lines of business, ahead of our original expectations. Our teams delivered outstanding performance in the first quarter, and I can't thank them enough for all their contributions to our success.
I'll now turn the call over to Devina, to discuss our first quarter financial results in further detail.