Harvard University

Photo by Quang Nguyen Vinh

Written by Zeng Han Jun

A recent survey showed that there is a slight shift in people’s interest in favor of renewable energy. According to this survey, governments should consider exerting more influence in raising environmental consciousness and bridging the gap between people’s desires and realistic energy alternatives (Zhang, Abbas,Iqbal, 2021). Popular renewable and clean energy options include hydroelectric, geothermal energy, wind energy, solar energy, etc.

By bridging the gap between people’s desires and realistic energy alternatives, the government could realise people’s expectation and also reduce the burden on our environmental ecosystem, but it is also important to note that operationalising, has its fair share of challenges. For example, in the United States, there is general consensus among some people that harnessing wind energy could be one of the solutions to alleviating the energy challenge. Among those who agreed, some have the Not-In-My-Backyard (NIMBY) mindset and do not want any of those power plants near their homes. 

Some cited personal health issues and environmental degradation, while others say that the construction will destroy the view from their houses and devalue the properties in the vicinity. All these concerns stand in the way of implementation and of course, I have to agree that these are indeed issues that should be addressed accordingly and dealt with properly. 

In the tropics and subtropics regions, we could be witnessing other increasingly challenging issues stemming from global temperature and carbon dioxide increase, its effect on the natural ecosystem and this might possibly disrupt the operations of hydroelectric power plants.  

Let me explain why.

As the global temperature and carbon dioxide increase, we might discover that it becomes more difficult to maintain biological control on the proliferation of aquatic weeds in many parts of the world (Baso, Coetzee, Ripley, Hill, 2021), more so in the tropics and subtropics. The tropics and subtropics region are located in parts of the world in which the sun is directly overhead at least one day of the year and is found within a band on either side of the equator from 23.5°N, and 23.5°S. These aquatic weeds can grow rapidly to cover the entire surface of lakes and rivers, some even setting deep roots and form strong lateral connections to each other as well. 

As mentioned earlier, these growing aquatic weeds might cause operational difficulties for hydroelectric power plants. It could lead to reduced throughput and eventually cause severe blockages. Hydroelectric power plants that are situated in Southeast Asia, would be at the greatest risk. Southeast Asian governments must anticipate these types of obvious problems and develop an integrated and multi-phased roadmap to tackle the upcoming challenges.  

So, do not naively assume all types of green are good. Some types of green when left unchecked, can contribute to severe environmental and commercial consequences. 

One of the problematic aquatic weeds is the water hyacinth species. This species grows very fast and some even flower under the right conditions. Many in fact think that it is very beautiful.  It  has a rapid growth rate in warm temperatures (Mitan, 2019) and can potentially cover the entire lake if left unchecked. This prevents sunlight from reaching the bottom of the lake and disrupts the lake ecosystem. In other parts of the world, local communities have tried to use pesticides to control aquatic weeds. Some tried to introduce insects such as weevils to feed on the water hyacinth to slow its growth but such methods also have its consequences.

Apart from meeting the issue head on, central and local governments could also try to mitigate the risk by transforming/ retrofitting the affected hydroelectric power plants to harness other forms of renewable and clean energy. It is more cost-effective to install alternative renewable energy devices on infrastructures that can already receive, store, transform and transmit electricity. 

Also, it is worthwhile to explore tapping on the creativity of the private sector to transform the issue into revenue-generating ideas such as collecting aquatic weeds, processing it and mixing the by-products with polymers to create fabrics that can be used for weaving garments thereby paving way for sustainable fashion. Or, the aquatic weeds could be harvested, processed and strengthened with chemicals to produce furniture thereby giving birth to sustainable furniture. Additionally, the private sector could also explore processing the aquatic weeds into edible food for humans, animal feeds and fertilisers, and export the final products to other countries (Oa, & Cf, 2015).

By including additional later stages such as breaking down these final products with pyro technology then harvesting the by-product as fertilisers (Ramirez, Pérez, Flórez, Acelas, 2021), the government, with the help of the private sector would be able to close the loop and further develop the entire idea into a circular economy. This can help to create new jobs, improve the economy and certainly goes well with the media.  

There are many ways to tackle the issue. The main enabler is to have a properly designed, integrated and multi-phased roadmap to guide the entire transition. 

References

Baso, N. C., Coetzee, J. A., Ripley, B. S., & Hill, M. P. (2021). The effects of elevated atmospheric CO2 concentration on the biological control of invasive aquatic weeds. Aquatic Botany, 170, 103348. doi:10.1016/j.aquabot.2020.103348

Oa, S., & Cf, O. (2015). Utilization of Treated Duckweed Meal (Lemna pausicostata) as Plant Protein Supplement in African Mud Catfish (Clarias gariepinus) Juvenile Diets. Fisheries and Aquaculture Journal, 06(04). doi:10.4172/2150-3508.1000141

Ramirez, A., Pérez, S., Flórez, E., & Acelas, N. (2021). Utilization of water hyacinth (Eichhornia crassipes) rejects as phosphate-rich fertilizer. Journal of Environmental Chemical Engineering, 9(1), 104776. doi:10.1016/j.jece.2020.104776

Zhang, Y., Abbas, M., & Iqbal, W. (2021). Perceptions of GHG emissions and renewable energy sources in Europe, Australia and the USA. Environmental Science and Pollution Research. doi:10.1007/s11356-021-15935-7

Photo by Pixal Bay

Written by Zeng Han Jun

As the climate continues to change, some parts of the world will become hotter and other regions will become colder. Combined with an increasing reliance on electronic devices to carry out our work and express our lives, our energy demands can only continue to grow and it will increasingly burden our existing electric grid system. 

Compounded with Work-from-home (WFH) arrangements, the matter might become worse, especially during winter/ summer. We have already been through one summer and one winter during this Covid 19 pandemic and already witnessed how it played a role in causing power outages in several regions around the world. Moving forward, we could expect to witness more power outages throughout various parts of the world.  

Office and industrial buildings are often located on the most capacious sections of a metropolitan electrical grid.  However, most residential area’s electrical grid system is generally built to support heavy consumption in the early mornings and nights, with hours to cool off throughout the day. Can residential area’s electrical grid system support WFH arrangements and perform at the same level as the electrical grid systems that are located in office areas?

Consumption patterns in cities such as New York and California have already shifted as a result of the Covid 19 epidemic, with demand peaking throughout the day. Overall use is already increasing by an average of 7% in New York City apartments (Meinrenken, 2020).

Source: Columbia University

There is no reason to believe that the changes we are seeing in New York City are not happening elsewhere. Where energy loads are predominantly residential and there is no proportionate drop in non-residential load, we should expect overall energy demands to continue to rise, with a higher risk of disruptions to current energy supply and distribution systems.

The danger of failure in aging transformers, cables, and other equipment grows when the summer heat and winter cold continue to hit new highs/ lows while heaters or air conditioners remain on throughout the day.

There are three things that household should be encouraged to do: 

1. Do an energy stock take of all the electrical appliances within the household; 
2. With the new found understanding of the energy consumption patterns, further identify the essential energy usage so that households can quickly make backup plans for those services during times of emergency; and 
3. Obtain alternative energy sources to tide over the emergency. Renewable energy sources and battery storage  must be able to provide sufficient energy for essential usages. 

Even if governments provide temporary reliefs during power outages in face of increasing/ decreasing temperature events , many companies that rely on remote workers in these regions will be affected by the reduced productivity.

As WFH arrangements continue, the oldest and most exhausted transformers and transmission equipment may be affected. Reduced commercial demand would jeopardise power companies’ revenues and, as a result, their capacity to replace outdated components in the long run, perhaps leading to widespread breakdowns in the future.

Governments must keep anticipating and prepare for possible future events and step in to work with power companies to audit the current electrical grid system. 

References

Meinrenken, C. J. (2020, April 24). New Data Suggest COVID-19 Is Shifting the Burden of Energy Costs to Households. Retrieved from https://news.climate.columbia.edu/2020/04/21/covid-19-energy-costs-households/

Photo by Maegan White

Written by Zeng Han Jun

There was a recent debate in South Korea about how solar panels are responsible for deforestation and possibly even linked to forest fires. It is not new. This argument has been going on for more than a decade but the stakes are much higher now. Investments in solar panels have been increasing steadily as energy providers try to diversify their business. Some of the oil companies are throwing significant investments into the solar business. That South Korea government unit acknowledged the report but neither agreed nor disagreed with the findings. However, the unit did share some best practices in solar panel installation, which is mainly about how the solar panels should be sloped during installation. 

To be honest, solar energy production in cities is clearly one of the many ways to reduce our reliance on fossil fuels and could be a good way to mitigate global warming by lowering Greenhouse Gas (GHG) emissions. Although photovoltaic (PV) renewable energy production has increased, questions remain about whether PV panels and PV power plants cause a “photovoltaic heat island” (PVHI) effect, similar to how an increase in ambient temperatures relative to wildlands causes an Urban Heat Island (UHI) effect in cities (Barron-Gafford, Minor, Allen, Cronin, Brooks, Pavao-Zuckerman, 2016). 

Cities are fundamentally concretised urban landscapes and the most significant impact of cities on local weather is the UHI effect. Heat islands are urbanised areas with higher temperatures than surrounding areas. Buildings, roads, and other infrastructure absorb and re-emit more heat from the sun than natural landscapes such as forests and bodies of water. Urban areas, where these structures are densely packed and greenery is scarce, become hotspots for outlying areas.

Some studies have pointed out that PV panels and PV plants change the structure of the landscape, in how incoming energy is reflected back to the atmosphere or absorbed, stored, and reradiated. Energy absorbed by vegetation and surface soils can be released as latent heat in the transition of liquid water to water vapour to the atmosphere through a process known as evapotranspiration (Masson, Bonhomme, Salagnac, Briottet, Lemonsu, 2001). PV kind of disturbs that process. So, a PVHI effect might be caused by a measurable increase in atmospheric warming as a result of a change in the balance of incoming and outgoing energy fluxes caused by the transformation of the landscape.

Research on PVHI is still ongoing while more investments are pouring into this domain. On the other spectrum, there are people who are very optimistic about this technology and even suggested using PV panels to pave roads and open space car parks. Their research has shown that PV pavement decreases surface temperature by 3 to 5 °C in summer and generates 11 to 12% less heat output at various climate conditions, all while generating electricity at the same time (Xie, Wang, 2021). 

PV technology is very important because we have an abundance of sunlight in most places but still we should not rely too much on a single energy source. It never makes sense to put all eggs into the same basket. Very cliché but I think that there is a lot of sense in that sentence. 

Given the current climate change condition, the scientific community still cannot collectively conclude how our environment will turn out in the future. Nobody dares to put a finger to it, especially when it has been discovered that climate models deviates a fair bit from real world conditions. To be fair, it is not easy to build a climate model because the climatic conditions are so complex, our mathematical models are good but there is the possibility that the math might not perform as expected when more factors come into play.  

Apart from using mathematics to forecast possible scenarios, people have also turned to observation of weather conditions on nearby planets as an indication of how Earth might turn out to be in the future. A lot of studies were performed on planet Venus in the 70s and 80s? Now, the people’s attention has shifted somewhat to the planet Mars but the scientific community are still onto the planet Venus though. Many within the scientific community agree that the study of the planet Venus could be one of the keys to understanding planet Earth’s possible future. 

First thing first, planet Venus looks beautiful from a distance but it is hellish within the planet’s  atmosphere, with surface temperatures in excess of 400 °C. Space probes sent to scout the planet, melted in an hour or two upon entering into its atmosphere. All the water had disappeared. An explanation stated that the water has broken down and the hydrogen escaped into space. Carbon dioxide and sulphuric acid are in excess throughout the planet. Quite literally a burning hell in our part of the universe. 

Some postulated that Venus used to be like Earth but later experienced a greenhouse effect. It then escalated into a runaway greenhouse effect. A runaway greenhouse effect, simply explained, is when there are too much greenhouse gases (usually water vapour) in the atmosphere which results in an increasing amount of heat trapped within the planet. The runaway greenhouse effect is most often associated with water vapour as the condensable GHG. In our case, the water vapour could reach the upper space limit of our planet Earth and escapes into space, resulting in a dried-up planet. This may have happened in the early history of Venus.

In the meantime, sea level will still continue to rise, for centuries to come. Many studies have shown that even if human-caused carbon dioxide emissions were to completely stop, the associated atmospheric warming and sea-level rise would continue for more than 1,000 years. These effects are caused in part by the residence time of carbon dioxide. The greenhouse gas can continue to stay in the atmosphere for a long time after it is emitted by industrial processes (NASA, 2017).

Flooding will continue to plague low-lying or coastal cities therefore there is a strong need to rethink urban planning and the grid system. Places with underground utility cables must reimagine how they deliver energy to houses and workplaces. Rising temperature might affect the insulation covers of the utility cables, exposing electrical wires to potential flood situations thereby causing danger to nearby humans/ animals and also pose obstacles to delivering energy to places beyond the power plant. 

We could explore siting power plants on top of individual buildings with cables delivering energy from the rooftop to respective units below. PV panels can continue to work at lower efficiency when clouds become denser and when the humidity increases. Still, we must be prepared to obtain energy from alternative sustainable energy sources, to augment the reduced output of PV power plants. 

Cities without alternative energy options will be at the greatest risk. Some of these cities are unable to harness renewable energy options like wind and hydro energy. As such, these cities must quickly pay more attention to less popular but emerging energy possibilities like hygroelectricity (converting humidity to electricity), piezoelectricity (obtaining electricity from crystals, dry bones or similar materials), etc. 

Last month, a Japanese team managed to successfully carry out an hygroelectricity experiment to power a very small motor (Komazaki, Kanazawa, Nobeshima, Hirama, Watanabe, Suemori, Uemura, 2021). I feel very encouraged by the results of their experiment. Even though the electricity output is very small compared to what PV panels can achieve, I feel that there is a lot of potential in scaling up this technology. The hygroelectricity generator could be constructed into a panel but mounted on external walls of buildings. Of course, there are still a lot of challenges ahead for this technology but I see some potential too. 

In fact, we must actively think out of the box (Very cliché, I know. We should really just do away with the box) and explore different alternative energy sources. There are significant advances in harnessing energy from sound (vibrations), heat (not geothermal), radioactivity, etc and we should reimagine how different energy sources could be wired up to a single battery station that delivers electricity to a localised building so that services could sustain even in the event of an intense and persistent flood. Of course, this is just a suggestion and there are many other ways to go about it too but first, we need to spark more conversations on this issue. 

References

(n.d.). Retrieved from https://www.epa.gov/heatislands

6 Causes of Urban Heat Islands and 4 Ways to Offset Them. (n.d.). Retrieved from https://www.buildings.com/articles/27532/6-causes-urban-heat-islands-and-4-ways-offset-them

Aggarwal, V. (2021, May 28). How Much Energy Does A Solar Panel Produce?: EnergySage. Retrieved from https://news.energysage.com/what-is-the-power-output-of-a-solar-panel/

Average monthly humidity in Singapore, Singapore. (1970, July 30). Retrieved from https://weather-and-climate.com/average-monthly-Humidity-perc,Singapore,Singapore

Barron-Gafford, G. A., Minor, R. L., Allen, N. A., Cronin, A. D., Brooks, A. E., & Pavao-Zuckerman, M. A. (2016, October 13). The Photovoltaic Heat Island Effect: Larger solar power plants increase local temperatures. Retrieved from https://www.nature.com/articles/srep35070

Evaluation of Electric Energy Generation from Sound Energy Using Piezoelectric Actuator. (2016). International Journal of Science and Research (IJSR), 5(1), 218-225. doi:10.21275/v5i1.nov152677

First Real Images Of Venus – What Have We Discovered? (2020, December 12). Retrieved from https://www.youtube.com/watch?v=Fbdojp9LTLc&ab_channel=TheSimplySpace

Hygroelectricity. (2020, June 03). Retrieved from https://en.wikipedia.org/wiki/Hygroelectricity

Komazaki, Y., Kanazawa, K., Nobeshima, T., Hirama, H., Watanabe, Y., Suemori, K., & Uemura, S. (2021). Energy harvesting by ambient humidity variation with continuous milliampere current output and energy storage. Sustainable Energy & Fuels, 5(14), 3570-3577. doi:10.1039/d1se00562f

Masson, V., Bonhomme, M., Salagnac, J., Briottet, X., & Lemonsu, A. (0001, January 01). Solar panels reduce both global warming and urban heat island. Retrieved from https://www.frontiersin.org/articles/10.3389/fenvs.2014.00014/full

Runaway greenhouse effect. (2021, July 31). Retrieved from https://en.wikipedia.org/wiki/Runaway_greenhouse_effect

Short-lived greenhouse gases cause centuries of sea-level rise – Climate Change: Vital Signs of the Planet. (2017, January 13). Retrieved from https://climate.nasa.gov/news/2533/short-lived-greenhouse-gases-cause-centuries-of-sea-level-rise/

Xie, P., & Wang, H. (2021). Potential benefit of photovoltaic pavement for mitigation of urban heat island effect. Applied Thermal Engineering, 191, 116883. doi:10.1016/j.applthermaleng.2021.116883