Features
Rainwater harvesting is an essential step to stave off impending disaster
by ACB Pethiyagoda
Much is being spoken and written about the scarcity of drinking water and water for other purposes as well as it is a global problem caused by rapid population increases. It is made worse by the resulting needs of the people in the production of industrial and agricultural goods which in turn require water for production. This is the second most pressing problem the world is faced with the rising population being the first.
The average person does not give sufficient, or worse still, any thought to the need for conservation of water in the home, in agriculture, in industry or in its other uses. Conservationists say that a dangerous situation is looming ahead of us, individuals, nations and the world itself as the demand is increasing at an alarming rate while water supplies remain near constant. Consider for instance the following recent findings of the United Nations Population Fund (UNPF).
By 2050 the world’s population will increase to 9.3 billion from the present 6.1 billion. The increase will be mainly in developing countries where water for all purposes is already in short supply.
To feed the world’s population about 36% of the available fresh water is presently used for food production. By 2025 this could increase to 70% to meet the demands of the increased population.
In 2000, as many as 508 million people lived in 31 water stressed countries and in 2025 there will be three billion people in 48 such countries.
The average person is estimated to require 50 litres of water a day for drinking, washing and cooking.
According to the Lanka Rainwater Harvesting Forum Sri Lanka’s present domestic supply of water was secured by piped water serving the majority of te people, tube well, protected dug wells and served by other means.
The Forum in an article some months ago in “The Island” captioned “Domestic Rainwater Harvesting: An Option to Solve Water Scarcity Problem” states that between 1996 and 2000 the country needed to invest Rs. 8,000 million a year to provide safe drinking water throughout the country by 2010. However, investment fell short by more than 50% each year and one never knows when this need will be satisfied. That being the situation it is up to every right thinking person to conserve water before we find ourselves in a situation from which we cannot escape.
Such conservation is an unquantifiable contribution but it certainly is the right attitude and in the right direction. It will create the necessary awareness by users of water, for whatever purpose, to the danger we are faced with and concerned people need to take steps necessary to mitigate the circumstances.
As far as domestic use of water is concerned one option available is to supplement water from normal sources at household and macro levels by rainwater harvesting as a stand by resource.
Rainwater harvesting is the collection and storage of water that runs off man made catchment areas such as roofs of dwellings or other buildings through gutters into brick and cement or ferrocement tanks built above or underground.
Sri Lanka’s mean annual rainfall is around 2,000 mm with some parts of the country receiving only about 500 mm and when monsoons fail severe droughts are experienced such as that in the Hambantota District recently. In times such as those people need not have had to walk miles in search of drinking water as often as they did if rainwater had been collected in homes and by communities. Roof material of buildings and gutters used for rainwater collection should be hard such as G1 sheets, tiles or asbestos as these could be cleaned periodically. Overhanging branches and trees must be removed to ensure the collection tanks are sealed securely to prevent mosquitoes and other pests from breeding and growth of algae.
In order to encourage rain water storage systems plans for new houses and housing schemes should receive the attention of planners, builders, engineers and architects.
In late 2002 and early 2003 Agromart Foundation’s Production society members in Hambantota, Monaragala and Ampara District built in their homesteads 2,888 rain water storage tanks. Each of these have a capacity of 5000 litres and cost around Rs. 15,000/= each. A single mould costing approximately Rs. 7000/= was used to turn out several tanks. The United Nations Development Programme (UNDP) bore 75% of the cost while Agromarts members met the balance. At times of low rainfall owners of these tanks found all the drinking water they needed without even stepping out of their compounds so different from the ordeal they went through in the past.
With regard to water conservation in agriculture the main principals of rain water management is to slow down the flow and allow water to seep into the ground. To achieve this stone bunds, drains and trenches on the contour need to be provided. For maximum conservation pits measuring about a foot deep and two feet long should be dug at short intervals at the bottom of the contour drains. In steep land spacing between drains and or bunds must be close and wider in less steep land. These bunds and drains also serve another useful purpose, which is by preventing soil erosion.
Soils must be rich in leaf mould and mulch to absorb and retain water particularly in dry weather and prevent its exposure to the sun. In dry weather, if watering of crops is possible, a thorough drenching every few days is more useful than light watering daily. Watering in the late afternoons is advised to prevent excessive evaporation, during the day.
Waste water from kitchens can be used safely in home gardens where, preferable, the application is direct to the soil avoiding the crop foliage.
Perennial crops such as young coconut and fruit trees benefit greatly in times of drought when earthen pots buried up to their mouths and at a distance of about five feet from their trunks are filled with water as and when required.
Drip irrigation systems, though installation is expensive, are very efficient in conservation of water while at the same time giving excellent returns on investment as water is made available in measured quantities as and when needed by the crop.
Conservation of moisture and build up of soil fertility at macro level can be achieved with agro forestry. This is a system in which trees, preferably leguminous varieties, are planted as a mix with crops. By this system soil is protected from damage resulting from the beating action of heavy rain and scorching by the sun; Nitrogen is added to soils from decaying leaf and small branches from toppings. The force of winds and fast flowing rain water are minimized thus preventing physical damage to crops and minimising soil erosion; the force of dry winds are broken and drying up of soils and crops is minimized.
Fodder, fuel wood, timber, food, and medicinal items are provided by some trees grown with crops. Degraded and marginal lands can be brought back to their earlier productive condition.
An example of an efficient system of agro forestry is seen in Sri Lanka’s tea plantations where Grevillea, Dadap, Gliracidea and Accacia hedges planted from early times act as shade, windbreaks and sources of green manure.
Conservation of rainwater has been practiced in Sri Lanka from ancient times with our Kings constructing those near miracles, the irrigation tanks. King Kasyappa in the fifth century had fountains and swimming pools in his rock fortress. Ancients Rome had an intricate system of harvesting rain water for domestic use. In Australia’s semi desert regions many thousands of homesteads, cattle and sheep farms depend on harvested rain water. Community rain water tanks are common in many parts of Africa.
What we need in Sri Lanka today is to recreate an awareness for the need to conserve water and get about doing it at all levels and spheres because water is precious and has no known substitute.
Rainwater harvesting the best answer to Jaffna’s water woes.The northern Jaffna peninsula, which has traditionally experienced a scarcity of uncontaminated underground fresh water, should consider adopting new rainwater harvesting methods to meet the increasing demand, a German expert said this week in Colombo.
“The Jaffna peninsula receives an average annual rainfall of 120 centimetres which is adequate for its population’s consumption needs if this water is captured, stored and governed correctly,” said Herald Kraft, a consultant for the German Development Cooperation’s (GTZ) Jaffna Rehabilitation Project. “In fact, rain water is the most uncontaminated water source in Jaffna, because there is almost no air-polluting industry on the peninsula and the main cloud masses reach Jaffna having passed over the sea.”
Mr. Kraft was speaking at a seminar held at the International Water Management Institute on the potential of rainwater harvesting in the Jaffna peninsula. The third of a series of seminars on the subject, it was organized by the GTZ Jaffna Rehabilitation Project, which has spearheaded relief and reconstruction work in Jaffna since 1996.
Funded by the German Federal Ministry of Economic Cooperation & Development, GTZ has been involved in the rehabilitation of the peninsula’s water supply system and the rebuilding of war damaged schools and houses.
Mr. Kraft, who had spent many months conducting a study on “Water Supply, Rain Water Harvesting, Waste Water and Solid Waste Management in the Jaffna peninsula”, revealed alarming information which indicated the gravity of the groundwater situation in Jaffna and the islands. The Jaffna topography is such, that the thin cover of soil over the ground water table, which consists mainly of sandy soil with an infiltration capacity of 50 m/d, provides no protection against pollutants from entering the ground water from the surface.
The sandy soil has very low absorption and therefore a low purification capacity. Whatever is applied onto the soil or buried in the loil reaches down to the ground water. Agricultural fertilizers, pesticides, fungicides and herbicides, as well as solid and liquid industrial wasters, oil, diesel and petrol and the wide variety of domestic and liquid waste can easily pollute the ground water.
The lime stone cover, which is widespread in the Jaffna peninsula, provides almost no purification capacity, permitting all pollutants reaching the ground water to spread far and wide. Salination, along with contamination from the surface, has made it vital for such drinking water from local ground water sources to undergo sophisticated chemical treatment before it can be considered safe for human consumption.
According to GTZ experts, with more and more refugees returning to their homes in Jaffna, the peninsula’s population is likely to increase rapidly, putting additional pressure on this already sensitive environment.
As a means of introducing and popularizing rainwater harvesting, GTZ will launch a pilot project at the Kopay Christian College. The school buildings at this college provide 1,845 square metres of roof surface and will be connected to a cistern of 600 cubic metres. It is estimated that this collection will be sufficient to provide drinking water to the students and teachers of the college for a year.
GTZ experts pointed out that schools, hospitals, and public buildings that have large roof areas, usually covered with clay tiles, are perfectly suited for rainwater harvesting. They hoped the success of the pilot project would encourage many others in the peninsula to adopt this method, which would ensure an alternative source of fresh, uncontaminated water for the people of Jaffna.
(Late ACB Pethiyagoda, a career tea planter worked for Ceylon Tobacco Co. in agriculture related projects post retirement and was associated in several water management initiatives. This article was written and first published in July 2023 in the Sunday Island)
Features
Approach to constitutional reform
The S.J.V. Chelvanayakam KC Memorial Lecture delivered on 26 April, at Jaffna Central College, by Professor G.L. Peiris, an academic with outstanding credentials, was published, under the title, “Federalism and paths to constitutional reform,” in The Island of 27 April, 2026.
In Part II of the publication, titled “Advocacy of Federalism: Origins and Context,” Professor Peiris states: “At the core of political convictions he held sacrosanct was his unremitting commitment to federalism…”. Contrary to popular belief, however, federalism in our country had its origins in issues which were not connected with ethnicity. At the inception, this had to do with aspirations, not of the Tamils but of the Kandyan Sinhalese. The Kandyan National Assembly, in its representations to the Donoughmore Commission in 1927, declared: “Ours is not a communal claim or a claim for the aggrandizement of a few. It is the claim of a nation to live its own life and realise its own destiny”.
Commenting on S.W.R.D. Bandaranaike’s views, Professor Peiris states: “Soon after his return from Oxford, as a prominent member of the Ceylon National Congress, was an advocate of federalism. He went so far as to characterise federalism as ‘the only solution to our political problems”.
THE COMMON THREAD
The thread that is common to the sources cited above is that while their focus was on the political framework, there is not even a hint as to the territorial units to which the political framework of federalism is to apply. With time the Tamil “nation” claimed that their federal State was to be the Northern and Eastern Provinces of Sri Lanka. However, the Kandyan “nation” was silent on this issue. Since Britain annexed the Kandyan Kingdom and the unified, then Ceylon in 1815, for all intents and purposes it would be reasonable to assume that the claim of the Kandyan “nation” was to be the region under the last Kandyan King, leaving the Western and Southern coastal regions for the Rest of the “nation”.
Sri Lanka, while being a colony under the British, was not interested in political frameworks. Instead, the British were interested in structural arrangements that facilitated Administration. It is evident from the evolutionary processes explored by the British that subdivided units of a State are critical not only for effective Administration but also for the political framework that ensures political stability. Federalism, advocated by the Tamil and Kandyan Leaderships for territorial units, as claimed by them, would inevitably lead to political instability. The lesson to be learnt is not to start with political frameworks, such as Federalism, but to first decide on the territorial units, within which a State functions, to ensure stability, and then frame political aspirations of the People belonging to such a State, in order to ensure political and structural stability.
LESSONS of HISTORY
Material from an article, dated 16 June, 2016
“When the British took control of the Dutch possessions in former Sri Lanka, in 1796, the Kandyan Kingdom was independent and separate from the Maritime region. The Kandyan Kingdom consisted of the “central highlands with the eastern and southeastern coastal strips”. It was after ceding of the Kingdom, at the Kandyan Convention of 1815, and after the rebellion of 1817-1818, that the two regions were merged. However, despite the merger, the administration of the two regions remained divorced from each other, with the Kandyan region being divided into 11 Districts, and the Maritime region into five, creating a total of 16 Districts for the administration of the whole country (Sir Charles Collins, Public Administration of Ceylon, 1951, p. 49).
“The above arrangements continued until the recommendations of the Colebrook – Cameron Commission. In 1832, the recommendations of the Commission were accepted , “… and the separate administrative system for the Kandyan provinces was abolished and amalgamated with the territories on the littoral acquired from the V.O.C. in a single unified administration structure for the whole island. The existing provincial boundaries within the two administrative divisions – the Kandyan and maritime provinces – were redrawn, and a new set of five provincial units, of which only one – the Central Province – was Kandyan pure and simple, was established. The new provincial boundaries cut across the traditional divisions and placed many Kandyan regions under the administrative control of the old maritime provinces” (K.M.de Silva, A History of Sri Lanka, 1981, p. 263), continued until as late as 1889, resulting in nine Provinces for the sole purpose of facilitating the Colonial administration. In point of fact, the Province never functioned as the administrative unit. Instead, the administrative unit was essentially the District, and the situation has remained so throughout the Colonial period and into this day. According to Sir Charles Collins cited above: “Most provinces were divided into districts, each Government Agent having charge of his own district, with general supervision over the whole province. The districts not in the direct charge of Government Agents were under the control of assistant Government Agents”. (Ibid, p. 62.)
PRIORITISING POLITICS OVER STABILITY
The lesson learnt by the British was that if a Colony is to be Administered effectively, the Colonizer had to choose the most appropriate unit of administration. Similarly, to an Independent Sovereign State, Territorial Stability should be its foremost priority. This means deciding on the most structurally secure territorial unit within which political power sharing should operate and not prioritise political frameworks, such as Federalism, at the expense of the structural stability of the State. Political instability would have been inevitable had Sri Lanka succumbed to pressures from the Tamil and Kandyan Leaderships.
Although Britain was not concerned with territorial stability, they recognised that the District was the most effective unit for effective administration. In fact, the 1977 Constitution describes the Territory of Sri Lanka in terms of Administrative Districts. Despite this, it was the Indo-Lanka Accord that first recognised the Northern and Eastern Provinces as political units. Following this, the 13th Amendment of 1987 extended this recognition to all Provinces.
The adoption of the Province as the political unit may not have had an impact on the territorial integrity of the Sri Lanka State, except for the Northern and Eastern Provinces, judging from the events that followed over three-plus brutal decades. The transformation of the territory of Sri Lanka, from Administrative Districts to Provinces and Provincial Councils, is the direct result of prioritising politics over territorial stability. For India to be the handmaiden of this transformation is beyond comprehension because instability in Sri Lanka, in whatever form, would impact on India’s own territorial integrity. This serious blunder cannot be ignored any further for the sake of both Sri Lanka and India. It is imperative that measures are taken to engage in a course correction through Constitutional Reform.
PROPOSED CONSTITUTIONAL REFORMS
The path to Constitutional Reform should start with the territorial subdivision of the Sri Lankan State into Districts, not only to ensure the territorial integrity of the State but also to improve administrative and development efficiencies coupled with Local Government units; a lesson learnt from the British. Any political powers devolved/decentralised to Districts should be the responsibility of District Councils, elected by representatives to Local Governments within each District.
Political power at the Centre should reflect the commitment to a single Sri Lankan Nation, through an elected Legislature, with Executive Powers being shared by a President/Prime Minister, with a Cabinet made up of all communities, in the ratio represented in Parliament. An attempt to share Executive Power with all communities, in an inclusive Cabinet, has not been the practice in the past, and under the present government, as well, despite its strident calls for unity and reconciliation. Consequently, the tendency for minority communities is to seek peripheral power to the maximum extent possible.
CONCLUSION
The approach to Constitutional making has been how best to accommodate political power in the form of Federalism, first by the Kandyan “nation” and later by the Tamil “nation”. The claim by the Tamil Leadership morphed from Federalism to a Separate State resulting in tragedies of an unimaginable order, to the point of threatening the very existence of the Sri Lankan State.
The current arrangement is based on Power being devolved to Provinces, in the form of Provincial Councils, with no regard the Province, makes to the territorial durability of the Sri Lanka State. How successive Governments hope to prevent threats to territorial vulnerabilities is to curtail the operation of sensitive provisions of devolved powers. This is being disingenuous.
On the other hand, the more direct and forthright approach to Constitutional Reform is to make the District the unit of peripheral power in order to ensure territorial stability and effective peripheral development and share Executive Power with communities in the ratio of their representation in the Legislature. The first could be achieved through a referendum and the second by the President/Prime Minister of any government. This approach prioritises territorial stability over political power; a change that has eluded policymakers. Therefore, it is imperative that territorial stability is given the foremost place in Constitutional Reform processes for the sake of not only Sri Lanka but also for India, for reasons of connectivity.
by Neville Ladduwahetty
Features
Time to get ready to face power
The power cuts are already here. Perhaps, even before the date predicted by the Public Utilities Commision of Sri Lanka (PUCSL. The peak load has gone well past the threshold they indicated as the tipping point of 3030 MW of peak load. It is now will past 3100 MW and growing, perhaps triggered by the continued heatwave making the use of air conditioners and fans more frequent and by a wider group of consumers. The government insists there is no intention of power cuts but each of us have experienced some form of power outage, without notice, at some time or other.
It is in this scenario that the Ceylon Electricty Board (CEB), or whatever it is called now, had directed all roof top solar projects, over 300 MW capacity, to shut down for the period 10th April to 20th April.
This is in addition to the curtailment of all ground mounted solar and wind projects, and even mini hydro projects, without compensation, going on for some months.
One year of inaction by CEB with the problem staring in the face
If will be recalled that the same demand was made in April, 2025, after the debacle of the countrywide blackout on 9th February, 2025, whether caused by a monkey or otherwise.
The question to be raised is what steps have been taken by the then CEB, or the Ministry to anticipate the situation this year, too, and to try and mitigate the same.
The easy answer is absolutely nothing. If at all what has been done is unilaterally prevent any further addition of Roof Top Solar PV, under the provisions of the Surya Bala Sangramaya (SBS), is, undoubtedly, the only short term and economical means to add low cost renewable electrical energy to the grid.
The architect of the SBS, the Sustainable Energy Authority is deafening by their silence, when their signature project of prime national importance has been sabotaged, and now even the performance of the already installed systems are being curtailed.
This action is totally unbelievable when the use of expensive oil-based generation will continue unabated, even during the day, when there is so much solar energy already installed. Of course, the age-old excuse will be trotted out, of the non-firm nature of Solar and Wind and problems of grid stability, etc.
Many useful and practical solutions to face the growing issue of how to integrate the essential low cost but variable resources of solar and wind to the grid as an aftermath of the blackout were discussed over a year ago.
But nothing seems to have even been attempted. The most prominent among these was the proposal to add 300 MW of grid scale batteries, as indicated in the already-approved Long Term Electricity Generation Plan ( LTEGP 2024 – 2044,) of which 100 MW should have been in use by 2026. The tender for the addition of 16 X 10 MW battery storage at selected grid substations was called over a year ago. Some expectation of sanity
It is under these circumstances that the PUCSL called for a stakeholder consultation on the 10th April, 2026, after circulating a concept note, which was well attended. It was a breath of fresh air, in view of the downhill slide of the entire electricity sector in the recent months compounded by the raging controversy of the coal scam and the rapidly increased use of expensive diesel, in addition to the other fossil fuels, just to keep up the generation to match the demand. The double whammy of the doubling of the fuel prices , exacerbated the hit on not only the consumer’s monthly bill, but the national economy and balance of payments.
Therefore, it was most encouraging to note from the PUCSL’s concept note that sanity has prevailed at last. We have been demandin–g some concrete strategies and time based targets to rid at least the electricity sector from the use of expensive, polluting fossil fuels, commencing with oil. This is the only means by which the utility could hope to achieve some degree of economic and financial viability. They have continued to burden the consumer and the country by continually jacking up the consumer tariff, while ignoring any prudent means to clean up their Act. As a matter of interest, the CEB’s own data of 2023 shows that it is possible to save some Rs 113 Billion annually by replacing all oil-based generation using renewables. The country could have saved over $ 700 Million in Foreign Exchange and the Consumer Tariff could have been lowered by Rs 7.00 per Unit across all segments of consumers.
Therefore, the PUCSL concept paper out lines, some credible measures to eliminate the use of all of forms of oil for power generation in stages. The three tier of approach, outlined as option 1 to 3, reproduced here, should be commended for adopting a pragmatic approach, with very good chance of success.
Proposed options by PUCSL
(See Options 1 Peak Shaving Approach by 2027 and Option 2: Eliminating 2.06 GWh/day of diesel-based generation)
Considering even the recent past when we achieved a status of zero oil use, as compared to the present sorry status, this is not an extremely difficult task. We will have to substitute Solar PV to bridge the gap of reduced Hydro during dry months.
(See diagram 1)
RE Contribution 69% % Oil Usage 6.2 % No Diesel
(See diagram 2)
In Contrast on 30th March RE Contribution was only -43,5%
and oil use has gone up to -29.59%
However, as outlined in the introductory paragraphs of the concept paper, the driving force to promote this change is the early declaration of appropriately worked out tariffs for installation of storage batteries and delivery of the stored energy to the grid.
With the total lack of progress of proposals in the LTEGP 2025-2044 by the state institutions, it is prudent to assume any future initiatives can only come from private sector participation.
Using the power granted by the recently ratified Electricity Act NO, 36 (As amended) the PUCSL has moved with commendable speed to develop the Feed in Tariff declarations needed to enable the achievement of the above objectives and a further stakeholder consultation was held on the 24th of April when more detailed proposals were put forward.
However, although the responsibility of publishing the tariff remains with the PUCSL, unless the National System Operator ( NSO ), tasked with the planning and implementation of Electricity Sector developments , takes urgent action to implement the desired changes as a highest priority task, nothing will be gained to help the country to get out of this quagmire.
The Consumer Continues to be Burdened.
Further, as the time table proposed by the PUCSL itself indicates, even the first of the options can be implemented only in 2027, with the others following up to the year 2030.
These are very encouraging time targets and the consumers will eagerly await their achievement.
However, the threat of power cuts, as well as continuing increase in consumer tariff to fuel the use of diesel for power generation, is real and current. A further tariff increase of 18% has been demanded by the NSO, on top of the 15% granted on 1st April, 2026.
The Immediate Options Available to Consumers.
a) The CEB now refuses to provide any grid connection for integration of any rooftop solar PV systems under the Surya Bala Sangraamaya.
b) The only way available to the consumers is to install Off grid roof top solar systems with adequate batteries to be none dependent on the grid. Use the grid only during the off peak hours.
c) During most periods of the year, even under cloudy conditions there is some solar generation. To ensure the daily consumption is more than covered by the solar input and any surplus is used to charge the battery, to the level adequate to manage the evening and peak hour demand, the capacity of the solar panels and battery have to be determined.
d) It is to be noted that although only the relatively high-end domestic consumers could find the proposed scheme financially feasible under the present cost regimes, which will improve further when the second tariff increase is announced shortly, to those consuming over 250 Units/Month, their engagement has a sector wise positive implication which is beneficial to all levels of consumers.
e) The scheme will operate in an off grid mode, without exports to the grid at any time. Therefore, they will not contribute to the often voiced worries of over voltage, instability and variability in the national grid.
f) Once the PUCSL announces the required FIT and the NSO or the Distribution Companies institutes the necessary facilities, such as smart meters, such consumers, too, can further assist the grid by export of any excess they generate.
Proposal to Avoid Power Cuts Implementable by Domestic Consumers
There are several drivers which will attract the potential ” Prosumers” to adopt this option without delay.
* The consumer tariff will continue to rise
* Even the former Roof Top Solar Systems, without batteries, does not provide power during the power cuts or blackouts
* At present day prices, the investment is financially feasible, based on the savings of the current level of monthly electricity bill. A substantial bank loan can be comfortably settled from the savings
* Now cooking with electricity is no longer a financial burden but can save one from the cost and danger of LPG shortages and queues
* What you, do based on your economic ability, will be a service to all consumers as the resultant reduction of Peak Demand means the use of Diesel can be gradually reduced and the lower end consumers, too, will benefit.
* You will enhance your green credentials with your own financial benefits.
The overall benefit to the grid and other consumers
If the element of exorbitant cost of diesel-based generation is removed then there is no need for the increase of consumer tariff for all consumers.
What is more important is that trimming the peak load would drastically reduce the need for any power shredding that is happening on the sly now and thereby benefit all consumers,
The summary of Financial Analysis illustrating the viability based on currently available data is given here. This will improve drastically if a further increase in consumer tariff is granted, which appears inevitable. (See Table 01 – The basic data used for this analysis is available on request.)
by Eng Parakrama Jayasinghe
parajayasinghe@gmail.com
Features
From Coal to Solar: China’s sunken mines power a Green Revolution: Lessons for Sri Lanka
In a striking symbol of the global energy transition, vast stretches of once-abandoned coal mines in China have been reborn, not as relics of an industrial past, but as shimmering hubs of renewable energy.
What were once scarred landscapes, destabilised by years of mining, and later submerged by landslides and floods, have now been transformed into expansive artificial lakes.
Floating atop these waters are some of the world’s largest solar power installations, quietly generating clean electricity on a massive scale.
Among the most notable are the Fuyang Floating Solar Farm and the Huainan Floating Solar Farm. Together, they represent a remarkable engineering and environmental achievement.
The Fuyang facility boasts an installed capacity of 650 megawatts, producing approximately 700 million kilowatt-hours of electricity annually. Even more impressive, the Huainan project reaches a staggering 1 gigawatt capacity, generating nearly 1.8 billion kilowatt-hours each year. Combined, these floating giants produce enough electricity to power millions of homes without burning a single lump of coal.
A former General Manager of the Ceylon Electricity Board (CEB), a veteran electrical engineer, described the development as “a glimpse into the future of energy systems.”
“What China has demonstrated is not just technological capability, but strategic foresight. Turning environmentally degraded land into clean energy assets is the kind of thinking countries like Sri Lanka must begin to adopt,” he said.
Why solar on water?
Floating solar, or “floatovoltaics,” offers a range of advantages that traditional land-based solar farms cannot easily match.
Water naturally cools solar panels, improving their efficiency by an estimated 10 to 15 percent. In hot climates, this cooling effect can significantly boost electricity generation.
Additionally, the panels reduce water evaporation, a crucial benefit in regions facing water stress. By limiting sunlight penetration, they also help suppress algae growth, improving water quality.
Perhaps, most importantly, floating solar eliminates the need for large tracts of land. In densely populated or agriculture-dependent countries, this is a game changer.
A dual economy: Fish and power
In an innovative twist, some of these floating solar farms incorporate aquaculture beneath the panels. Known as the “fisheries + solar” model, it allows communities to cultivate fish in the shaded waters below, creating a dual-income system, energy production above, food production below.
This integrated approach not only maximises resource use but also supports local livelihoods, blending sustainability with economic resilience.
Environmental dividends
The environmental benefits are substantial. The Fuyang project alone reduces carbon dioxide emissions by an estimated 580,000 tons annually, while the Huainan facility cuts emissions by around 1.6 million tons each year.
Beyond emissions, these projects reclaim landscapes once deemed unusable—areas heavily damaged by coal extraction. In doing so, they rewrite the narrative of industrial decline into one of ecological restoration and innovation.
Sri Lanka: A nation poised for floating solar For Sri Lanka, the implications are profound.
Unlike China’s abandoned coal pits, Sri Lanka possesses thousands of irrigation tanks, reservoirs, and hydropower catchments that could serve as ideal platforms for floating solar. From the ancient tank systems of the dry zone to major reservoirs like Victoria Dam and Randenigala Reservoir, the country holds untapped potential to generate clean electricity without sacrificing precious land.
The country’s reliance on thermal power, particularly during drought periods when hydropower declines—has long been a challenge. Floating solar could provide a stabilising solution, reducing dependence on costly fossil fuels while complementing existing hydroelectric infrastructure.
Energy analysts note that integrating floating solar with hydropower reservoirs can create a hybrid system: solar power during the day, hydropower balancing supply at night. This synergy enhances grid stability and reduces overall generation costs.
The former CEB official stressed the urgency:
“Sri Lanka cannot afford to delay. With rising energy demand and climate pressures, we must explore every viable renewable option. Floating solar on our reservoirs is one of the most practical and scalable solutions available.”
Challenges and the road ahead
However, experts caution that careful planning is essential. Environmental assessments, grid integration, and financing mechanisms must be properly addressed. Community engagement, especially where fisheries are involved—will also be key.
Yet the blueprint already exists.
China’s transformation of submerged coal mines into renewable energy hubs offers more than inspiration—it provides a working model. For Sri Lanka, adapting that model to its own geography could mark a decisive step toward energy independence.
China’s floating solar farms stand today as one of the clearest symbols of a world in transition—from fossil fuels to renewables, from environmental degradation to restoration.
For Sri Lanka, the message is equally clear: the future of energy may not lie on land alone—but on water, where sunlight meets innovation.
If harnessed wisely, Sri Lanka’s vast network of reservoirs could one day mirror that transformation, turning calm waters into engines of sustainable growth.
by Ifham Nizam
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