Jessica Fischer
Chief Financial Officer at Charter Communications
Thanks, Chris. Let's turn to our customer results on Slide 6. Including residential and SMB, we added 77,000 Internet customers in the second quarter versus 38,000 in the prior year period when excluding last year's Internet disconnects, related to the transition from EBB to ACP. Video customers in the second quarter declined by 200,000, wireline voice declined by 221,000, and we added 648,000 mobile lines. Internet churn remains near-record lows for the second quarter and flat year-over-year and Internet gross additions improved year-over-year.
The year-over-year improvement in Internet net additions was driven by tailwinds from our rural construction initiative, the continued success of our Spectrum One product, better sales yields from higher-tenured employees, and a slower pace of fiber overbuild in our footprint during the quarter. Despite the year-over-year improvement in net adds, overall market activity remains well below pre-COVID levels partly driven by very low move rates.
We also continue to see some impact from fixed wireless access competitors in the price-sensitive customer segments of residential and SMB. As Chris mentioned our Spectrum Mobile products continued to perform well in the quarter. The majority of new lines continue to come from existing Internet customers though the percentage of lines coming from new customers continued to increase and with higher than what we saw in the first quarter.
Portents from other carriers as a portion of our gross additions are essentially the same today as they were prior to the launch of Spectrum One despite much higher mobile sales and with good usage on those promotional lines and unbeatable quality and value at a $30 retail price point, we expect the lines to perform well as long-term customers.
Turning to rural. Subsidized rural passings growth accelerated in the quarter with 68,000 passings activated and we continue to expect approximately 300,000 new subsidized rural passings this year. Additionally, costs are coming in as planned and we have the labor, equipment, and supply necessary to execute our build. We continue to bid on additional subsidies. In addition to DDoS, we've now won over $700 million in state subsidies for over 300,000 passings with a gross build cost of approximately $1.7 billion and a per passing cost to Charter net of subsidies of approximately $3,200. As Chris mentioned, we also look forward to the BEAD bidding process, assuming the right regulatory conditions.
Moving to financial results starting on Slide 7. Over the last year, residential customers grew by 0.2% with new customer growth driven by Internet, partly offset by video-only customer churn. Residential revenue per customer relationship declined by 0.3% year-over-year given the higher mix of non-video customers and growth of lower-priced video packages within our base partly offset by promotional rate step-ups, rate adjustments, and the accelerated growth of Spectrum Mobile. As Slide 7 shows residential revenue declined by 0.3% year-over-year.
Turning to commercial, SMB revenue grew by 0.2% year-over-year reflecting SMB customer growth of 1.7% partly offset by lower monthly SMB revenue per customer primarily due to a higher mix of lower-priced video packages and a lower number of waistlines per SMB customer. Enterprise revenue was up by 3.2% year-over-year, enterprise PSUs grew by 6.2% year-over-year, and excluding all wholesale revenue, enterprise revenue grew by 7.2%. Second quarter advertising revenue declined by 16.5% year-over-year due to less political revenue. Core advertising revenue was down 3.5% year-over-year due to a more challenged advertising market, partly offset by our growing advanced advertising capabilities. Other revenue grew 28.5% year-over-year, driven by higher mobile device sales. And in total, consolidated second quarter revenue was up 0.5% year-over-year and up 1.1% year-over-year when excluding advertising.
Moving to operating expense and adjusted EBITDA on Slide 8. In the second quarter, total operating expenses grew by $48 million or 0.6% year-over-year. Programming costs declined by 7.8% year-over-year due to a decline in video customers of 5.1% year-over-year, a higher mix of lighter video packages, partly offset by higher programming rates in the second half of 2022 by higher programming rates. In the second half of 2023, we now expect year-over-year growth in programming cost per video customer to be similar to the growth we saw in the first half of 2023.
Other costs of revenue increased by 15.4% primarily driven by higher mobile device sales, other mobile direct costs, and higher RSN costs driven by more Lakers games, partly offset by lower ad sales costs. Cost to service customers increased by 3.6% year-over-year, driven by adjustments to job structure, pay, and benefits to build a more skilled and longer-tenured workforce, resulting in lower frontline employee attrition compared to 2022 and additional activity to support the accelerated growth of Spectrum Mobile, which was partly offset by productivity improvements, lower service transactions per customer, and lower bad debt.
As we mentioned last quarter, our employee attrition has declined more quickly than we expected given the programs we discussed at our December investor meeting. In response, we lowered our normal hiring in the first half of this year and our overall headcount is now normalizing with increasing overall tenure and quality. Longer-term, we continue to expect to see additional efficiencies and costs to service customers. As a result of our continuing lower service transactions service tenure and digital service investments, proactive maintenance and network evolution investments.
Sales and marketing costs grew by 3.6%, primarily driven by higher staffing across sales channels and the accelerated growth of Spectrum Mobile and other expenses declined by 0.4%, driven by favorability in insurance expense, mostly offset by higher labor costs. Adjusted EBITDA grew by 0.2% year-over-year in the quarter.
Turning to net income on Slide 9, we generated $1.2 billion of net income attributable to Charter shareholders in the second quarter, down from $1.5 billion last year with higher adjusted EBITDA more than offset by additional interest expense.
Turning to Slide 10, capital expenditures totaled $2.8 billion in the second quarter, above last year's second quarter spend of $2.2 billion. The increase was primarily driven by higher spend on line extensions, which totaled $1.1 billion in the second quarter of 2023 compared to $693 million in the second quarter of 2022. The increase in line extension was driven by Charter's subsidized rural construction initiative and continued network expansion across residential and commercial greenfield and market selling opportunity. Second quarter capital expenditures excluding line extensions totaled $1.8 billion compared to $1.5 billion in the second quarter of 2022. We spent more on upgrade rebuild, primarily due to our network evolution initiative, and support capital was higher, primarily due to investments in information technology systems.
For the full year, we continue to expect capital expenditures excluding line extensions to be between $6.5 billion and $6.8 billion. Following the expected completion of our network evolution initiative at the end of 2025 or the beginning of 2026, capital expenditures excluding line extensions as a percentage of revenue should decline to below 2022 levels and continue to decline thereafter and we expect 2023 line extension capital expenditures to reach approximately $4 billion. We continue to expect 2024 and 2025 line extension capex to look similar to our outlook for 2023 at approximately $4 billion per year and our 2024 and 2025 line extensions capital expenditure expectations assume we win funding for or otherwise commit to additional rural spending including BEAM.
As Slide 11 shows we generated $668 million of consolidated free cash flow this quarter versus $1.7 billion in the second quarter of last year. The decline was driven by higher capex, mostly driven by our network expansion and network evolution initiatives, and higher cash taxes as we became a full federal cash taxpayer in 2023. We finished the quarter with $97.8 billion in debt principal. Our current run-rate annualized cash interest is $5.1 billion and as of the end of the second quarter, our ratio of net debt to last 12-month adjusted EBITDA was 4.47 times. We intend to stay at or just below the high end of our 4 times to 4.5 times target leverage range.
During the quarter, we repurchased 1.1 million Charter shares and Charter Holdings common units totaling about $400 million at an average price of $341 per share. While our goal is to grow the business in the long-term, our focus on execution is driving operating leverage in the business even now, when you take the noise from political ad -- when you take out the noise from political advertising, EBITDA grew by 1.3% year-over-year in the quarter, which means that we are more efficient despite significant mobile growth and a one-time step-up in labor investments and we believe our financials will improve as we move later into the year with additional revenue growth in Internet and mobile that will begin showing in Q4 and lower service cost per customer as we realize the 10-year benefits of our investment in employees and lap last year's labor step-up.
Longer-term, we also expect to see continuing benefits and operating expenses from further digitization, network improvements, and benefits of programs like proactive maintenance. We are well-placed for the future.
Operator, we're now ready for Q&A.