Summary:
- Huang Ming recognized that millions of rural households in northern China struggled with something simple but essential, access to hot water, and designed an affordable solar heater that worked reliably even in freezing conditions, unlocking demand among people who previously couldn’t consume the solution.
- He built an entirely new market by educating consumers, fixing performance gaps with better technology, driving costs down, and creating a local distribution network that made adoption visible and self-reinforcing.
- This approach scaled dramatically, reaching tens of millions of households, generating millions of jobs, reducing emissions, and demonstrating how solving a specific, everyday constraint can catalyze widespread economic and social transformation.
In the early 1990s, roughly 830 million people, about 74% of China’s population, lived in rural areas where per capita net income was just $189 and households spent nearly 60% of their budgets on food. But in northern China, poverty had a texture that income statistics could not capture: cold.
Winters lasted up to five months. In Dezhou, Shandong, temperatures dropped to −6°C (21°F) and plunged as low as −20°C (-4°F) further north. For millions living in unheated brick houses with no piped water, no bathroom, and no gas, heating water meant loading coal into a stove and waiting forty to sixty minutes, whether for cooking, washing, or bathing.
Those who could not spare enough coal went to the public bathhouse in town instead, paying for the privilege of washing alongside strangers. Bathing became a ritual most families performed once or twice a week. Not because they did not want to be clean, but because coal cost money, waiting cost time, and the cold turned the whole experience into something to be endured rather than enjoyed.
The emergence of solar water heaters in China
Huang Ming, a petroleum equipment engineer at the Petroleum Research Institute in Dezhou, had spent his career thinking about energy. A professor had told him China’s petroleum reserves would last only fifty years. So alongside his day job, he began researching solar energy quietly, designing and testing devices in his spare time.
In 1988, he built his first solar water heater for his mother, whose rheumatism flared up when she washed with cold water. It worked like putting a kettle on the roof and letting the sun heat. A dark collector absorbed sunlight, hot water rose naturally into an insulated tank above it, and when the tap was turned, hot water came through. He funded more prototypes from his salary, gave early units away, and quietly tested the market in Dezhou.
Huang saw something others had missed. China had been producing solar water heaters since the early 1980s, but flat-plate designs imported from the West performed poorly in cold northern winters and remained too expensive for ordinary households.
By 1995, one million yuan in debt and operating out of a small storage room, Huang Ming founded Himin with roughly one hundred employees, no distribution channel, no consumer awareness, and no government support. The only thing he had was a product that solved a problem millions of people felt, and seven years of watching his neighbors show the demand was real.
Creating a market
Since most consumers had never heard of solar water heaters, Huang took a bold and expensive bet in Himin’s first year. He bought prime time national TV advertising slots and nearly pushed the company into bankruptcy. He also dispatched teams across rural China on a science popularisation campaign that, over time, distributed more than 10 million copies of a solar energy newspaper. The two campaigns did not only sell a product but they also created a new category. And within a year, Himin had become China’s number one solar energy brand.
Although demand was present, it wasn’t without complication. Customer complaints mounted as the gap between what early heaters promised and what they delivered in cold northern winters became visible. Rather than managing the complaints, Huang scrapped a large quantity of merchandise, established a dedicated research institute, and launched a full reform of the product line.
Through this process, Himin replaced its flat-plate design with the all-glass evacuated tube, an indigenous Chinese innovation developed at Tsinghua University. Unlike flat plates, the vacuum between the glass layers eliminated heat loss entirely, so the system performed as well on a freezing overcast January day as in full summer sun, stripped to its simplest possible form: no electricity, no pump, no moving parts. Just the sun heating a rooftop kettle and gravity delivering hot water inside, in any weather, through any winter.
Himin brought manufacturing fully in-house, and built one of the world’s largest solar thermal production facilities, with 4,000 staff in Dezhou and annual capacity of 3 million water heaters and 20 million evacuated tubes, relentlessly driving costs down. A solar water heater system that had sold for several hundred dollars in the late 1990s dropped to under $200, saving a household up to $120 per year and paying for itself in under two years.
Scaling the market
Distribution posed a different challenge. No retail channel in rural China carried solar water heaters, so Himin built its network from scratch, recruiting local entrepreneurs at the county level, training them in installation and after-sales service, and franchising the brand to give them incentive to sell. Dealers joined because demand was already arriving. Every evacuated tube array mounted on a roof was its own advertisement, visible to every neighbour who passed. The roofs did the selling.
When Himin was founded in 1995, China’s solar water heater industry was producing just 5.4 million square feet of collector area annually. By the end of 2000, cumulative installations had reached about 280 million square feet. The evacuated tube drove that growth as rural households across northern China found it delivered reliably what the coal stove had always made so costly. The demand that drove those numbers also built Himin’s nationwide network to more than 50,000 people by 2004.
Huang Ming used his platform as a member of the National People’s Congress to co-draft China’s Renewable Energy Law, passed in 2005, formalising support for an industry the market had already built. A decade later, 85 million, mostly rural, households had solar water heaters and China held 290 GWth of solar thermal capacity, around 70% of the world’s total.
The impact
The numbers tell part of the story. China’s 85 million installations were displacing an estimated 80 million tonnes of CO₂ annually, the equivalent of closing 49 coal-fired power plants. The industry Himin seeded had grown into an ecosystem of roughly 3,000 firms at its peak, and by 2022 employed an estimated 5.57 million people across manufacturing, distribution, installation, and after-sales service. Dezhou, a city of 5.6 million people, became known as China’s Solar City.
But behind the numbers, something harder to measure had also changed. Rural women who had bathed once or twice a week were bathing daily. Over two decades, that shift in how ordinary households heated and used water spread across every province, and in doing so built something equally significant: a culture of solar familiarity on which China’s clean energy dominance would later be built.
Himin’s story is not simply a story about solar energy. It is a story about what happens when an entrepreneur identifies a specific daily struggle and builds a company entirely around solving it.
By driving the cost of a single product below the threshold where switching from coal was financially obvious, Himin did what decades of development finance had assumed impossible: created a mass market among the rural poor without subsidies, without credit, and without donor support. Eighty-five million predominantly rural households made an economically rational purchase decision because the arithmetic was self-evident and every installed system was proof enough for the household next door.
There are struggles like this waiting across the developing world today. The technology exists. The demand exists. What innovators need to do is channel the discipline Huang Ming applied to solving one specific problem for millions of nonconsumers.
