29:00 Lena: Miles, all these technological innovations sound promising, but let's talk about the economics. How much is all this going to cost, and who's going to pay for it? Are we looking at affordable solutions or expensive luxuries?
29:15 Miles: That's the million-dollar question, Lena—or maybe I should say the trillion-dollar question! The global water infrastructure investment needed over the next decade is estimated at around $6.7 trillion. That sounds massive, but when you break it down, it's actually quite manageable.
29:32 Lena: Six point seven trillion? That does sound massive! How do you make the case that it's manageable?
29:38 Miles: Well, consider that the global economy is about $100 trillion annually. So we're talking about investing less than 1% of global economic output per year to solve one of humanity's most fundamental challenges. Plus, much of this investment will generate economic returns through improved productivity, reduced health costs, and new business opportunities.
30:00 Lena: What does the business case look like for these water technologies?
30:03 Miles: The economics are actually getting quite compelling. Take desalination—the cost has dropped from about $1.50 per cubic meter in the 1990s to under $0.50 for the most efficient plants today. Some new facilities are producing water for as little as $0.30 per cubic meter.
30:18 Lena: How does that compare to traditional water sources?
30:21 Miles: In many water-stressed regions, desalinated water is now cost-competitive with traditional sources. And when you factor in the reliability and independence it provides, the value proposition becomes even stronger. Cities like Perth, Australia found that desalination was actually cheaper than building new dams and pipelines to access distant water sources.
30:39 Lena: What about the smaller-scale technologies we discussed, like atmospheric water generation?
30:44 Miles: Those costs are plummeting too. Atmospheric water generators that cost $20,000 just five years ago are now available for under $5,000. Some residential systems are approaching $2,000, which puts them within reach of middle-class households in developed countries.
30:58 Lena: And the operating costs?
31:00 Miles: That's where renewable energy is making a huge difference. Solar-powered atmospheric water generators can produce water for as little as $0.02-0.05 per gallon in sunny climates. That's competitive with bottled water and much cheaper than trucked water in remote areas.
31:13 Lena: What about the smart water technologies? Are those expensive to implement?
31:16 Miles: The beautiful thing about smart water systems is that they often pay for themselves through water savings and operational efficiencies. Smart irrigation systems typically have payback periods of 2-4 years through reduced water bills and improved crop yields.
31:29 Lena: Can you give me a specific example of the return on investment?
12:32 Miles: Sure! Barcelona invested about $42 million in smart water meters and reduced water consumption by 25%. The water savings alone paid for the investment in less than five years, not counting the operational efficiencies and improved customer service.
31:47 Lena: What about financing? How are countries and cities paying for these investments?
31:51 Miles: We're seeing innovative financing mechanisms emerge. Green bonds specifically for water projects have grown rapidly—there were over $50 billion in water-related green bonds issued in 2023. Public-private partnerships are also becoming more common, where private companies invest in water infrastructure in exchange for long-term service contracts.
32:09 Lena: Are there examples of successful public-private partnerships in water?
32:13 Miles: Singapore's approach is often cited as a model. They've partnered with private companies to develop their NEWater recycling facilities and desalination plants. The government provides policy support and guarantees, while private companies bring capital and technical expertise.
32:25 Lena: What about the developing world? Can these technologies be made affordable for lower-income countries?
32:30 Miles: That's a huge challenge, but there are promising developments. Some companies are developing simplified, lower-cost versions of advanced technologies specifically for developing markets. Others are using innovative business models like pay-as-you-go systems or community ownership models.
32:44 Lena: Can you give me an example of how that works?
32:46 Miles: In Kenya, some companies are installing solar-powered water treatment systems in rural communities using a subscription model. Families pay a small monthly fee—often less than they were spending on bottled water—and get unlimited access to clean water. The system pays for itself over time and provides ongoing maintenance.
33:01 Lena: What role do you see international development organizations playing?
33:04 Miles: Organizations like the World Bank, Asian Development Bank, and various UN agencies are increasingly focusing on water infrastructure. The World Bank alone has committed over $25 billion for water projects over the next five years. They're also helping to de-risk investments in developing countries to attract private capital.
33:20 Lena: Are we seeing new business models emerge around water?
14:41 Miles: Absolutely! Water-as-a-Service is becoming popular, where companies provide guaranteed water supply and quality for a monthly fee, handling all the infrastructure and maintenance. There are also emerging markets around water trading, where regions with surplus water can sell to water-stressed areas.
4:06 Lena: Water trading? How does that work?
33:38 Miles: Australia has one of the most developed water markets. Farmers and cities can buy and sell water rights, which creates economic incentives for conservation and ensures water goes to its most valuable uses. During droughts, water prices rise, encouraging conservation and more efficient use.
33:52 Lena: What about the job market? Are these water technologies creating new employment opportunities?
33:57 Miles: The water technology sector is creating jobs across the skill spectrum—from high-tech engineering and data analysis positions to installation, maintenance, and operations jobs. The International Renewable Energy Agency estimates that water-related renewable energy projects alone could create over 2 million jobs globally by 2030.
34:13 Lena: Looking at the next decade, do you think water technologies will become affordable enough for widespread adoption?
34:19 Miles: I'm quite optimistic. We're seeing the same cost reduction curves that we saw with solar panels and LED lights. As production scales up and technology improves, costs will continue to fall. By 2035, I think many of these technologies will be not just affordable but actually cheaper than traditional alternatives.
