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ghana, an african coastal nation of over 30 million people, is a perfect destination for westerners –– especially those tracing their roots. yet, the cost of living in ghana is higher than most arrivals may expect. one of the main drivers for the high real estate prices is the expensive cost of building materials.

what if there was a solution that doesn’t only provide affordable housing, but helps to protect the fragile environment which is already vulnerable to the negative effects of climate change?

nelson boateng, founder and chief executive officer of nelplast eco ghana limited is a young ghanain entrepreneur, a leading voice that is repurposing and diverting tons of plastic waste from landfills and oceans into affordable building materials for the construction of low-cost houses in ghana.

“when the collected plastics are brought to us, we scale and pay the collectors according to the weight. the plastics are crushed, washed semi-dried and mixed with sand and sometimes, pigments to add beauty. the mixture is then fed into an extruder with 3 heating zones, which we build ourselves. since we are using all kinds of plastic waste at their right proportion, these plastics have different melting points. as they travel through the extruder, let’s say starting from 150 degrees celsius, 180 to 220 degrees celsius, the heating zones ensure that all kinds of plastic waste is well melted and mixed with sand. this mixer comes out as a paste, which is placed in a mold with a cooling system around it and then pressed under hydraulic press. between 60 to 70 seconds, we eject one product out depending on the size and shape of the product. this product would then be packed on the palette and ready to be installed. nelplast echo plastic houses are 30% to 35% cheaper than the concrete buildings that we have, and most of our clients are happy with our projects.”

for the longest time, plastic has been the material of choice for different kinds of packaging due to its lightweight, affordability and ease of use. however, the long run consequences of easy packaging on the environment are far reaching. according to a recent undp report, ghana generates over a million tons of plastic waste every year and only 2% to 5% of the plastic waste is being recycled, and project drawdown reveals that recycling could help reduce our carbon footprints by 2 gigatons come 2030. yet, more and more concerns on the negative effects of plastic use on health, raises questions on whether there are any negative impacts of living in a house constructed from plastic waste! and how solid and resilient are these structures to natural disasters? 

“nelplast bricks are not laid with cement. they are interlocked with each other and due to that nature, they are able to contract and expand when there’s uncertainty on the earth. it can also withstand earthquakes because the walls are not rigid. they have the ability to be flexible when there is any earthquake. also in terms of cracks, the wall with plastics doesn’t crack so easily. the bricks are cheaper and stronger than conventional bricks. they can withstand water lock areas and also avoid dampness to the walls. they are safe in terms of fire, because the high percentage of the sand makes the product fire retardant. it’s not easy for these bricks to just get burnt. the bricks are designed in such a way that there is a groove in the middle of the brick that heat from outside to penetrate into the inner part of the room and also maintain the temperature of the inner part of the bricks.”

reduce, reuse, and recycle! this is the recommended way of life that boateng is actively working to promote in his home country – ghana. nelplast eco ghana limited, born out of frustration with the disturbing amounts of plastic waste continuously buried in landfills is an initiative committed to rid the country of the gulf of plastic waste that is polluting the environment and water bodies, while securing economic opportunities for the unemployed youth in ghana.

“we have the problem of plastic waste, the problem of school infrastructure, housing deficit and  unemployment. nelplast is trying to use the problem of plastic waste to build affordable houses and solve the problem of housing in ghana. build schools, create jobs for unemployed youth to reduce social violence and clean the environment. currently, nelplast employees 63 workers directly and over 300 indirect workers and 98% of this indirect workers are women who go around the landfills, drainage and beaches to collect plastic waste and sell to us – and that’s how they earn their living.”

boateng’s drive to save the environment from plastic pollution does not go by unsupported or unnoticed. 

“we won ghana uk based achievement award as innovation and technology of the year; emy africa – the green corporate star award; african product and service award; ghana property award as best echo construction product; ghana industry award; seed low carbon award and the business executive excellence award.” 

however, his ability to scale the business is confronted by many challenges.

“ghana has a lot of challenges and one of them is the cost of electricity. there are no subsidies for recyclers in ghana and that is really discouraging others to join the line. i have passion with plastics because at the age of 13 i was already working with the plastic industry. i did computer network engineering but my passion is how to deal with plastic waste. also, because of our capacity issues we get a little bit scared of accepting more contracts. a lot of people are calling who want a house, but the problem has to do with our capacity. so because of that, this year we are handling only 15 clients, next year we can add on. if we can have subsidies from the government on electricity bills, soft loans to help us expand, i think it will go a very long way.”

a recent world bank report projects that waste will grow from 2 billion tonnes in 2020 to nearly 3 billion tonnes by 2050, and the effects may be more adverse for developing countries, where more than 90% of trash is either dumped in the open or burned, worsening the climate crisis. as many look forward to the un international climate conference – cop27 – just around the corner, boateng is curious to know where plastic pollution fits in the conversations.

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[editor’s note: this transcript was edited for clarity.]

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correction (9/7/2022): an earlier version of this story misidentified where in africa ghana is located. this version corrects it.

in fact, water conveyance — the transportation of water — is one of the largest energy consumers, accounting for about 8% of the entire country’s energy usage. and it turns out that we are conveying a lot more water than we need.

according to mark kovscek, founder and ceo of conservation labs, most of the infrastructure supporting water transportation is more than 50 years old, and faulty.

“most of our infrastructure was built in 1970 or earlier and needs to be replaced or repaired,” he said. “that cost in the next 10 plus years will be about 4.7 trillion dollars.”

water leaks generally account for about 15% of your monthly water bill. kovscek’s newest product, h2know, helps find those leaks to fix them. h2know is a smart water meter that connects to an app on your mobile device and saves you about $250 annually in water bills.

how h2know works

you can install h2know in less than 10 minutes to your own main pipeline, where the device takes live readings, thousands of measurements per second, of the pipe’s water flow.

every water-using device: washing machines, faucets, toilets, and even leaks, have a unique water signature, meaning that the rate of water flowing through the main pipeline changes according to which device is being used, and through advanced data analytics and machine learning algorithms, these measurements are converted into useful information for homeowners. this data will tell you exactly which device is using water and when, and also identify leaks as they happen. the real-time response is important, according to kovscek, because otherwise homeowners tend to ignore problems like these.

the example kovscek gives is of a homeowner with a leaky toilet. the homeowner notices a leak from the toilet’s connecting pipe after a few days, but puts a container under it and decides to take care of it later. after three consecutive months of a water bill $30 higher than usual, she finally calls a plumber. by that time she already has lost $90, plus the cost of the plumber.

an h2know device would have notified the homeowner as soon as the leak started and also offered her the contact information for a local plumber, and diy instructions on how to stop the leak.

h2know encourages the behavior of taking care of problems as they happen, resulting in less water loss and money down the drain.

according to kovscek, the app “casually reminds folks that there is this broader issue that’s out there of conservation.”

the app part of h2know aims to “gamify conservation,” kovscek says. it aims to compare a homeowner’s water usage to an average, or to a household with a same number of people living in it. this makes it a competition to conserve water. in other words, it provides incentive for people to begin changing their water use habits. the app also provides suggestions for ways to cut back on water usage.

kovscek’s conservation labs recently won one of the eureka parks climate change innovator awards at the consumer electronics show in las vegas — the first year they’ve given this environmental award — for its h2know, and the company has an indiegogo campaign running in order to bring their product to market.

h2know market projections 

according to kovscek, hexa research estimates the smart water meter market space to be about $2 billion. his own estimations came in at about $1.5 billion, although this market analysis was made before the smart water meter existed at all. kovscek explains that this projection is driven primarily by four factors:

the first is homeowners’ adoption of connected smart home devices. markets and markets estimates the smart-home industry will be worth $137.91 billion by 2023.

the second factor is increasing water rates. circle of blue estimates that in the past five years, water rates have increased by 40% in 30 major u.s. cities. kovscek says that his own bill is projected to rise 17% in the next year. these rising rates are due to old infrastructure being used to transport water, an estimated $4.7 trillion job for repairs and replacements that citizens are seeing in the form of rising water rates and taxes.

the third market-driving factor is climate change. citizens in california were mandated to reduce their water consumption by 20% during the most recent drought, a feat determined by habit and identifying leaks, both things which h2know addresses. similarly, extreme weather events and temperatures cause pipes to freeze and unfreeze at unprecedented rates, causing decaying pipes and water damage.

the fourth factor is the increasing public awareness of sustainability and environmental issues. people want to buy the most sustainable product and are becoming more conscious of consumer responsibility and dollar voting. all of these factors are driving a $2 billion product market, fit for h2know.

what sets h2know apart from its competitors is its lower price point — and its potential for investment returns for the homeowner. the appliance and app cost less than $100, and could save the homeowner as much as $250 a year. kovscek also estimates his product has a shelf life of 10-plus years, so customers don’t have to spend money replacing or repairing the device on a routine basis.

kovscek said h2know is able to operate at such an affordable price due to the research and care that the team at conservation labs put into it. kovscek himself has an impressive background in data analytics, with a degree in mathematics from carnegie mellon university, and having worked for a long time solving big problems using advanced mathematic techniques. he is a numbers guy at heart, and sees what he does as “fun exercises in data science” that he is passionate and excited about, rather than as work.

with his expertise, conservation labs has invested the time and money into machine learning in order to sift through the messy and complicated data that their low cost sensor produces. kovscek said this is different from other products on the market that use expensive sensors, which need to be installed by a plumber, and are invasive to the water infrastructure design. while some of these other products are fitted with an application that is capable of directly turning off the water supply as soon as a leak is detected, these technologies are entering the market at about $500. products at this price might save water, but probably won’t save much money. 

the future of water conservation

in the future, kovscek hopes to produce a product that works in tandem with h2know and will directly turn off the water supply when a leak is detected. he hopes to customize one of these products that already is on the market to work compatibly with h2know and provide homeowners with this additional feature.

while the primary focus of conservation labs right now is on homeowners, and shipping out the first 1,000 h2know devices by the end of the year, kovscek sees the possibility of bringing h2know to commercial spaces in the future.

there is a “need and market with commercial places too,” he says, but “it is hard to scale with wi-fi being the primary communication protocol.” it would be hard to have a wi-fi network responsible for reaching the area included within a city’s limits, not to mention the problems associated with wi-fi security, passwords, and privacy protection.

in order to bring h2know to universities, towns, and cities, they would need to use a different communication platform. however, it is doable, and would help to identify leaks and trouble spots in city infrastructures that need replacement, ultimately saving tax dollars and increasing water rates.

conservation labs is still looking for partners with similar values with whom they can go to market, and is looking forward to having many of those conversations this year.