Search This Blog

Monday, November 1, 2021

Why the Electricity Prices & WholeSale Electricity Rates are so high?

Jump to 

1) Update: 18 December 2021    New Energy Prices
2) Update: 25 December 2021   LNG Crisis Eased.
3) Update: 25 December 2021  New Tariff likely to be much higher.
4) Update: 30 December 2021  New Tariff for 1st Qrt 2022.

Other Related Articles


1 November 2021

Updated 2nd December 2021

Abstract:

There is a price hike in LNG  recently due to a global supply and demand issue.  This has caused the oil price to rise slightly.  According to EMA,  the Electricity price in Singapore should always track the oil price but this was not the case recently since 4 October 2021.  Singapore's wholesale electricity price has gone up by about 5 times whereas oil price hardly has any increase.  This article will try to find out why.  It also discusses how best we can "invest" in this turbulent electricity market.

"Invest" in Electricity Market?

Some will ask,  "I am on electricity fixed rates,  what electricity market are you talking about?". The answer is,  irrespective of whether we are on fixed-rate,  monthly-rate, or otherwise,  we are always inside the electricity markets so long as the country has de-regularised the electricity business and we are having an open electricity market.  Electricity supply on fixed-rate,  monthly-rate is just the type of electricity packages in the electricity market.  We must always know how the oil price or natural gas price is affecting us.   

Oil Price?

Again,  some will say,  "We are using mainly natural gas,  will oil price matter?"

In some countries like the US,  oil prices and gas prices are separately fixed by different markets.  They might have different prices.  Even in Asia,  we also have different pricing for LNG.    However,  in many other countries, like Singapore,  gas price is often pegged to oil price for some reasons  The gas prices used for generating power in the latter will fluctuate with the oil price.  Therefore,  the open market electricity price in these countries will fluctuate as much as the oil price depending on the supply and demand.

What Supply and Demand?

In an open electricity market,  the electricity price is always determined by a market called "The electricity market".  This market,  regulated by the local Electricity Authority will have the generating companies supplying and selling the electricity and the big consumers like the Municipal Electricity Board and the big electricity consumers,  bidding and buying the electricity.  Because the market is so small with a few players,  the market,  unlike the usual stock market,  will have special rules to encourage pricing competition (see Appendix2).  One thing is for sure,  the price will fluctuate wildly at times especially when demand outstrips the supply.

What we will have to do?

Whether or not we are on fixed-rate or wholesale rates quoted by electricity retailers or Municipal Electricity Board,  the price would be affected by the electricity market unless we are buying electricity at the usual regulated price.   We must always assess the oil or gas price before we buy electricity.  This is because energy price is always the biggest component in any electricity pricing.

How?

Oil or gas Futures prices either at the US's Chicago Mercantile Exchange (CME) or local stock market will always determine and affect the energy price.   Some Asian countries might have energy prices indexed with the Asian LNG market depending on the energy policy.   One must know how the energy price will move.  This is essential if one really wants to judge whether to enter the electricity market on a fixed price or wholesale price or just stick with the regulated electricity price.   There are also other things to watch out for.  

It will be riskier to jump to a conclusion just because one electricity supplier can supply the cheapest price for some reason.  If that is the case, it would be better for one to stick to the usual regulated electricity price.  The electricity market is not for us.

Why?

The Electricity Market,  in one way or another,  works like a stock market except it is heavily regulated.  Unless one is familiar with a stock movement,  their business background, etc,   one would not buy the stock of that company just because it has the cheapest price in the market.  Similarly, an electricity retailer can go burst,  applying the unfavorable terms in the contracts and selling us electricity at an unreasonable price without the blessing of the regulating bodies.  It is then left to ourselves versus the electricity retailer to settle the problem. The regulator might be acting just as the Arbitrator if the retailer did not break any rules. 

Then How?

The following can be used as reference:

1)  Shortlist the electricity suppliers in terms of their business background to assess if they are trustworthy and can remain in business within the contract period;

2)  Find out which among the shortlisted can supply you the electricity at the cheapest and cost-effective rate.  Some will have special offers that are better than others;

3)  As to whether to take up long term or short-term contract or just a % discount from the usual regulated price,   one will have to assess what energy price will be likely within the contract period.   If one expects the energy price to go up and up,  then it will be good to sign a long-term contract;  otherwise,  just sign a short-term one or even take up the % discount or just the usual regulated price;  then,  wait for the energy price to drop to the bottom before signing up for a long-term contract. 

What is the Energy Price Now in Singapore?

a)  The Brief


The electricity price in Singapore is always fixed by the EMA's Electricity Market.   Gencos,  the generating companies,   will offer every half-hour to sell the electricity into the spot market.  Rightly speaking, large electricity consumers, electricity retailers will bid or buy the electricity.  Presently,  there is no consumer bidding per se in the market.  The Power System Operator (PSO), governed by EMA, will provide the demand load for each period based on the collected information.  The power generating companies (Gencos) will then offer their selling price based on these demand load and their operating cost of which,  energy price will be the main component.  


90% of Singapore's power generation is using natural gas.  In the past,  Singapore's natural gas for power generation are imported through piped gas from Indonesia.  That gas price is pegged to oil price according to the supply agreement until 2023 (see reference 4).  LNG began to supply in 2013. Because of this,  there was this speculation about the Gencos in Singapore are using LNG prices when they offer their selling prices in the EMA's Electricity Market.


Singapore used to have an LNG Futures Market in SGX Exchange Board that supposes to fix the price of LNG but now it has been replaced by the Electricity Future's Market.   The LNG  price in Asia is now fixed by the  LNG Japan/Korea Marker PLATTS Future - (JKM). 


Anyway,  EMA believes that the natural gas price that is used for power generation is still pegged or indexed to the oil price.  EMA claimed that "This is the market practice in Asia for natural gas contracts".    Therefore,  this article will be using only oil price and SGX electricity future price as guides to assess the future energy prices in Singapore.


If the price is not pegged to the oil price,  the trend would be a lot different in the energy pricing today because there is a global demand and supply issue presently lingering around the natural gas pricing.  More countries are converting their coal or oil-fired to natural gas-fired power plants & also,  there is a natural gas supply shortage globally.

 

b)  SGX Electricity Future (Chart to be updated regularly)


From the December 2021 Contracts and the Contracts beyond,  it would appear that the electricity price has gone over the peak of 522 on October 14.  It is around 356 on Nov 25 and is slowing dropping towards 185  for the December 2022 contracts.   It is likely the trend of the electricity price is falling going forward.  Note that this chart will be updated regularly.







c)  Oil Price Future (chart updated on 2 Dec 2020)

If EMA is correct that the natural gas is pegged to the oil price,  then it would be better for us to view the energy price using the oil price chart. 

The Situation on 2 December 2021

The Technical Analysis of the oil price chart indicates that the price has dropped about 19% since Friday, November 26 when the market was spooked by the fear of a new Covid variant,  called Omicron, emerging from South Africa.  

The oil price now rests on the upper trendline of a falling wedge that has been trapping the oil price since 2008.   The oil price will make attempt to recover from this point.   If it is not successful,  we shall see a bearish oil price pattern falling toward USD50/= which is around the breakeven price of a new oil project today in the US.  


Note:  Please note that the scale of the chart is in months,  the analysis assumes that it will take weeks or months for any price movement.  




The WSJ Market 

The Crude Oil Contracts (CL1 @ NYMEX) in the WSJ Market is showing a declining trend for the various future contracts. The price trend is shown attached.  The chart predicted that oil price is likely to fall in the future months.



Why is Singapore Wholesale Price still rising?

The recent readings of the electricity price in Singapore have no sign of falling despite an 18% fall in oil prices.   The following chart is showing that the Electricity price in Singapore is not tracking the oil price;  instead,  it is trying to follow the LNG price trend.    

The chart shows that LNG spiked by 4.5 times and the Electricity price went up by about 3.5 times since March 15,  2021.   Before August 2021,  the Electricity price was tracking oil price nicely.  This is not what EMA has been saying about the natural gas used for power generation being indexed or pegged to the oil price.  




Conclusion

The sudden rate jump in those taken up wholesale electricity prices is reflecting the open electricity market prices.  It will go up and down according to the energy price because energy is the biggest component in power generation.  One should always get out of the wholesale market,  either taking up the regulated electricity price or other electricity price plans at the moment.  Which plan to take next will depend much on the Future pricing and trending of the energy price. 

Should natural gas used for power generation be indexed to the oil price as what EMA has indicated,   the Electricity Future Price should have tracked the oil price and started to fall.   It would appear there is some confusion in the Electricity market that will require the attention of EMA.   They should investigate why the electricity price in Singapore was not tracking the oil price.    




back to top
Update: 18 December 2021

1) SGX Electricity Futures

The electricity futures hasn't yet responded to the hike in Asian LNG prices on 16 December.   The next few days will see if the hike in LNG price will make any difference.  The price has risen slightly from $356 per unit @ 27  November to the present price of $465 per unit



b)  Nymex Crude Oil Price

The Nymex crude oil price has slid again to hit USD70/=.  But it has reflected from the trendline as shown in the attached.  Until the price drop below the trendline,  it would be hard to tell its exact direction.

c)  Asian LNG Price

The Asian LNG price has broken the rising wedge that has trapped the LNG price since early 2021.   The trend is very bullish bearing unforeseen circumstances.



back to top
Update: 25 December 2021

LNG Crisis in EU and Asian Region eased.

The Asian LNG took a plunge on 23 December when the price tumbled over 16% to fall from a height of $24/= on 21 December.  The combined effect of Russian increasing natural gas output, China buying gas from the US, and US merchants diverting gas to Europe could have caused this drastic drop in price.   

Technically speaking,  the gas price is falling back into the bearish rising wedge.   Barring unforeseen circumstances,  one could say the natural gas crisis in the EU and Asian regions has been eased.  It is back on track to where it was before;  hopefully,  the breaking down of the bearish rising wedge will cause the gas price to ease further. 





back to top
Update: 25 December 2021

New Tariff for Next Quarter likely to be much higher. 

The electricity futures has stubbornly stayed above 460 and would not want to come down especially after the LNG price spiked over 20% earlier in the week.   The futures price for December 22 went up more than 25% from 180 a week ago to 226 today.  We expect the regulated tariff for the next quarter in 2022 to be adjusted upwards.    This announcement is likely to be made within this week.  This higher regulated tariff might prompt the other electricity retailers to adjust their price plans to follow suit.



back to top
Update: 30 December 2021

The SP group announced today that Singapore's regulated electricity tariff for the first quarter of 2022 will increase by 5.6 per cent.  This increase of 1.33 cents per kWh from last quarter is the fourth consecutive quarterly increase since January 2021 as shown by this chart.  The new electricity tariff is closely tracking the price of oil price.

Saturday, October 30, 2021

Burner of the Stove Won't Hold Flame

The burner of the gas stove won't hold the flame all of a sudden. What can be wrong and how to go about repairing it?

What happened?

One of the 3 burners in our Ariston gas stove refused to hold its flame when we changed to a new tank of gas.   This happened suddenly.  What can be wrong?

What's Wrong

This sort of problem will happen because there is an inbuilt safety feature to turn off the gas to the burner automatically.   This safety feature is supposed to work only when the flame at the burner went out suddenly while the gas is still flowing.      However,   when there is something wrong with the feature,   the flame at the burner will not hold its flame as you have just seen.  

To understand the problem better,  let examine this simplified diagram showing only the burner and its control mechanism.    

The heart of the control system is the solenoid valve.    During proper operation and when there is a gas flame at the burner,   the thermocouple will generate a small electric current to power the solenoid.  This will cause the solenoid to hold on to the plunger,  allowing gas to flow through the valve.

To understand the problem better,  let examine the above-simplified diagram.   The diagram shows an electric thermocouple is connected electrically to the solenoid valve which is the heart of the control mechanism.  This thermocouple is always installed near the burner so that when there is a flame,  the flame will heat up the thermocouple and generate a small electric current to power the solenoid.  Inside the solenoid valve is a spring-loaded plunger.   At the end of the plunger,  there is a rubber seal.   At the other end,  there is a small magnet attached to the plunger.   

When the burner is not in use,  the rubber seal will close the valve,  stopping the flow of gas even if the shut-off valve is opened

During normal operation,  if someone pressed the control knob as shown, a gust of gas will flow into the solenoid chamber,  This will push open the plunger towards the solenoid.  If at this moment,   the burner is lited up,  the flame will heat up the thermocouple.  This will generate a small electric current to power the solenoid.   This powering of the solenoid will hold the plunger in an open position through the magnet.,  This action will allow the gas to continue flowing through the control valve.    

During this operation,  if the flame goes off for some reason, or the burner was not lited up,  the thermocouple will stop generating electric current.  The plunger will then return back to its original position and close the control valve 

How to Repair?

There could be a few troubleshooting steps to carry out in order to repair the problem.    The troubleshooting should always start from the source,  i.e. the thermocouple.  

The troubleshooting will need some skills.  This video will be able to help.

Wednesday, October 27, 2021

What is this Dry Mode Control in Air Conditioner?

Those who have newer air conditioners bought in recent years will notice that there is an additional button in the remote controller.  This button is called "Dry Mode".  Some like it as they claimed it could save energy; some just ignore it completely.   This button is not available in the older models. What is this button and how does it work to provide cooling?

Why The Button?

Our body is sensitive to temperature as well as humidity. When the temperature is hot or cold, our bodies can feel it immediately. When the humidity is high or low, we might not feel it immediately but over time, our body will react to it. 

This is because 1/2 to 3/4 of our bodies are full of water. When water evaporates fast enough from our bodies, we will feel the sensation.  The feeling is just like we are under a fan.  The air blowing towards us evaporates vapor from our bodies.  The faster the airflow,  the higher the evaporation, the better will be the cooling. 


The air conditioner is also an air dehumidifier but not as efficient as a real dehumidifier.  When it cools the air,  it also removes water vapors from the air.  This is a natural cooling process. The dry mode button will instruct the air conditioner to operate more like a dehumidifier.
 
The dry mode will be particularly useful in tropical countries where humidities are usually high.  The dry mode can help to lower humidity in the room more quickly than the normal cooling mode.
 

How Does it Work?

As a simple illustration of how airconditioning and dry mode works,  if the air conditioner's airflow is strong, it is working as an air conditioner; on the other hand, if the airflow is reduced, it is working as a dehumidifier.   It appears that the airflow is forcing the air conditioner to change from air conditioning mode to dry mode. 


Slow Fan Speed Not Freeze Coil?


Of course, its controls are not so simple.  The control involves also the speed control of the compressor.  There is also a need to make sure the cooling coil will not freeze when the airflow is reduced.  This is why the dry mode button is not always available in older models that have fixed-speed compressor motors.

This is one possible control strategy:

The Best Design Strategy for Dry Mode?


Dry Mode slows down the fan speed so that the evaporator coil can condense more vapor out of the air when the air passes through the coil.  It will use some energy and be able to lower the humidity faster than usual to an acceptable and comfortable level.    

Different manufacturers have different design strategies for dry mode; some adjusted also temperature as well as the airflow in their cooling strategies. The idea is to achieve a desired comfortable cooling condition.

It has been commonly accepted by researchers that the most comfortable room cooling condition is 25oC@ 55% humidity. This is the room condition that most manufacturers are using to design their air conditioners.  
For the angle of saving more energy,  there is a tendency for the professional to pick 65% humidity level as the new comfortable humidity level.  

Anyway,  different people might have different feelings and reactions towards temperature and humidity.  For this reason,  most manufacturers will still allow users to adjust the temperature in the dry mode.  If temperature adjustment is available in dry mode,  most users will still use 25oC as the setpoint temperature.   This does not necessarily save energy.  This is because the energy to maintain the room at the comfortable setting of 25oC@ 55% humidity will more or less remain the same. 

Will Dry Mode Save Energy?

The dry mode lowers the fan speed allowing moisture in the air that flows through the evaporator coil to be removed more quickly.  It still consumes about the same energy to maintain the room's humidity at the desired comfort level of 55%.  However,  if one finds it comfortable to allow the room temperature to be set higher than the usual 25oC, one will be able to save some energy.

Operating an air conditioner at econ cooling mode or auto mode will save more energy as the air conditioner is always set to run at the most efficient designed load capacity under this operating mode. Depending on the design, the airconditioner's efficiency can vary a lot at different load capacities.


Difference between Cool, Dry, and Econ Modes?

The newer air conditioner having an inverter or otherwise to control the speed of the compressor motor allows 2 additional modes of control,  namely Dry Mode and Econ Mode.  The differences between them are briefly described in this table:

ModeMode DescriptionUsageEnergy Saving
Cool ModeDefault modein hot and humid weather to maintain constant temperature controlSaving Depend on selected temperature;
Dry ModeNew FunctionIn not too hot weather or raining season to lower humidity to achieve comfort coolingSave energy if the temperature can be allowed to be set higher.
Econ ModeNew FunctionIn not so hot weather to run the air conditioner at a most efficient levelPrevent excessive low-temperature cooling to lower electricity bills



Sunday, October 24, 2021

Why Singapore has a Sudden Increase in Covid New Case?

Jump to:

3) Update : 11 December 2021
 
Lastest chart update about Covid situation in Singapore
Expert said Antigent Rapid Test or LFT works with Omicron
South Africa Adds Antigen Test


24 October 2021

Abstract:

Lockdown is an effective way to curb Covid from spreading.  It works by isolating all or part of the community,  trying to force the infected,  especially those asymptomatic to stay away from the rest of the community;  hopefully,  by testing or otherwise,  these infected people will disappear over time. 

Instead of using the Lockdown method,  Singapore implemented free and easily accessible Antigen  Rapid Test Kits (ART) in September 2021.  This has managed to flush out thousands & thousands of asymptomatic patients,  who otherwise will stay hidden in the Community,  spreading Covid silently.  The success will depend on whether this new method can flush out the asymptomatic patients in the Community.

Introduction

Singapore used to be one of the best in handling the spread of Covid pandemic disease.   It used to have the lowest Covid infection rate as well as the death rate.  Many countries have taken it as a model.    Lately,   Singapore's infection rate has risen exponentially;  at the same time, the death rate has also increased slightly as shown in the following chart.  It has recorded infection new cases hovering at around 3,000 to 5,000 recently.



Possible Reasons

The following might be the reasons:-

1.  Increase in a spread of Covid infection; 

2.  Increase awareness in the community to carry out frequent testings;

3.  Management lapse and negligence.

There were active web discussions about the reasons why.  Many are clueless.  Some attributed this to the pervasive Mandatory Fast and Easy Testing (FET) rules in September 2021.  Others blamed the mismanagement.  There are also people saying the mRNA vaccine is not effective.  This article will make an attempt to explain.


Why?

The recent rapid increase could be due to a combination of the above reasons.  

There could be a real increase in the spread of infection.  Many countries that opted to live with Covid also experienced the same. But many countries,  especially the European countries, are using  Antigen (ART) testings as an alternative to do away with Lockdowns.  This is because of the frequent street protests from the residents.



Singapore has just introduced this new rule using Antigen testing in September.  The new rule makes it mandatory for the residents,  especially those workers,  to do self-testing at regular intervals or whenever they are feeling unwell.   This move must have flushed out many hidden cases that otherwise will go unrecorded,  spreading Covid in the community.    

Sudden increase Not by Variants

The sudden increase in Singapore is not caused by variants.  If it was so,  the Authority would have reported it, and such statistics would have been reflected in the GISAID webpage
Click picture to go to the GISAID webpage


The "Silent Covid Spreaders"?

Although there was no known statistical testing done,  this technical article using a decision analytical model estimated that about 59% of Covid transmission came from people without any symptoms.  These people without any symptoms are known to be "Silent Covid Spreaders".

These people are always living real in the community,  spreading and transmitting Covid silently every day.  The Covid virus can also grow stronger by the day.   That is the reason why many countries failed to contain the disease.  Many countries have conceded and changed their strategies from "Zero Tolerance" to "living with Covid".

How Can We Flush Out these Silent Covid Spreaders?

Mass testing is always done to flush out these  "Silent Covid Spreaders".   Following up with Lockdowns is the way to complete the job.

In the past,  residents & visitors to the infection areas or clusters are always troubled and made to line up under the hot sun or corridors for many hours to get their Covid testing done.  This was when only a few hundred infected people were found daily. 
 
Today,   this scene is no more around but many thousands were found.   Some more,   about 99% of those found infected are without symptoms or with mild symptoms.  Why it is so?

Brought-in-Dead (BID)

Many countries with very high Covid infection rates often use BID (Brought-in-Dead) or DOA (Dead on Arrival) to measure the gaps in health services or the seriousness of the pandemic disease in the field.  It measures how many people are brought in Dead before any effort is put into resuscitation.  This indicator will often stand up when the health services are so loaded that they cannot handle the pandemic disease.  


So far,  there were no such BID reports in Singapore even though the new infection cases have been hovering around 3,000 to 4,000 daily at the moment.  The health services were still able to handle the new cases.   Why is it so?


Case Fatality Rate (CFR) vs Infection Rates

CFR is a ratio between confirmed deaths and confirmed cases.   CFR can be used roughly to indicate how serious is pandemic in a country.  Therefore,   countries with higher CFR can mean countries are having pandemic that is more serious than those with lower CFR.  The country with a higher CFR might have a lot of very sick people.   Presently,  Singapore has very high infection cases but very low CFR.  One reason is that 99% of the infection cases are asymptomatic.   How do they do it?






The Possible Answer
The sudden increase in infection rate happening in Singapore can be viewed as the result of the latest move by the Government to live with Covid and do away with "Circuit Breakers" aka lockdowns.  But at the same time,  they are flushing out the "Silent Covid Spreaders".  

First,  Singapore announced a new Covid testing rule in August/September.   It introduced and started ART,  the Antigen Self Covid Testing in September.  It made ART testing mandatory in some establishments in early September.  The month-long result must be good for them to extend mandatory ART testing to the rest of the community including the residents by 1st October.  Offenders would be taken to task and cases publicized.  

Second,  it has given every household a free blood oxygen meter and some free ART Self-Test kits to start with.    After that,  more ART Self Test kits were made available for free.


In addition,  the Government is making sure:-

a)  The free Self-Test kits are made readily available also to those infected.  They can draw the test kits from vending machines located all over the island on a 24/7 basis;

b)  The kits are also distributed to companies, factories,  construction sites,  offices & establishments for them to test each and every worker regularly daily.  

All those who tested positive using self-test kits & display symptoms (mild or otherwise) will have to submit the results to the Authority for PCR confirmation as required.  Once confirmed,  the patients will have to wait for the quarantine instruction from the Authority.  Home quarantine is only allowed for those aged below 60.  

Most Singaporeans are generally aware of the strict law enforcement in Singapore.   They don't want to be caught by the laws.  Many must have diligently carried out the self-testing at their premises. 

After such a move started on Sept/Oct,   PCR testing centres,  information service, and treatment facilities were overwhelmed and overloaded.   Those waiting for Authority's instructions were often seen complaining in the forum about the long waiting time.   The infection rate suddenly shot up.    It would appear that the Singapore Government's latest strategy of flushing the "Silent Covid Spreaders" started working.  

With ART testing kits easily available,  people are aware if they have been infected by the deadly Covid and seek medical attention at the earliest instant.  Hence, no BID reports so far.



Corresponding Increase in Hospitalisation and Death Rate

Although there was a corresponding increase in the number of hospitalization and deaths putting some pressure on the medical system,  this could be due to the emergence of a new infection wave or pattern.   But this did not attract the Authority to sound any alarm or raise the DORSCON (Danger) level because:- 

1)  The hospitalization number is rising slightly

This chart shows the number of infections vs the number of hospitalization. It indicates that the hospitalization number has risen only slightly. This was after they introduced ART testing.  It is not rising in tandem with the infection. 

2)  The majority of those infected were having either mild or no symptoms.  They have been put either in-home quarantine order or in Community Care Centre for observation.  


3)  The death rate per 100,000 is still very low. 


4)  The Weekly Ratio of Infection in the Community is falling

The Ratio of community cases in the past week over the week before has been falling gradually ever since August.















This Could be What Happen


1.  Before ART Testing is in place
The "Silent Covid Spreaders" would stay at home and would not pay money to visit the clinic when they have had flu-like symptoms,  like fever or sore throat.  They would visit the clinics only when they became very sick.  

Mass testing done can get at most,  a few hundred "Silent Covid Spreaders"

2.  After ART Testing is in place
The same "Silent Covid Spreaders"  will usually use the free blood oxygen meter to test for fun.  When reading is low,  they become curious and use the free ART testing kit to confirm.   With positive readings from ART testing,  they will get panic.   wondering if the sickness will get worst and they will want to visit the clinic or the testing centres in the next very first hour.  As a result,  clinics are lately seeing a lot more infection cases.

This explains why no mass testing was done but Authority can get several thousand in a day. 
 


What about Cost-Effectiveness?

Giving out free blood oxygen meters and ART testing kits to every household may look to be a wasteful and overkilled effort initially.  Many people did not expect it to be well-received because Singaporeans,  by nature,  are always reluctant to share personal information voluntarily even though submitting the test results is mandatory.    

Now it turns up that this strategy of self-testing is not only successful,  it is also cost-effective.  The Government can save at least the cost of the following items:-

a)  The first PCR testing which otherwise would cost another US$100/=.  This is because 2 PCR testing will be needed to confirm the infection;

b)  The cost of setting up and manning of field testing stations;
c)  The manpower and admin for tracing,  calling up & monitoring all the testing work.  The majority might not be even infected and PCR testings are always wasted.

As for the Singaporeans,  they can save themselves from the agony of spending valuable time,  lining up for hours to get mandatory PCR testing done.

Results:  

1) Flushed out Thousands of  "Silent Covid Spreaders" 

The following chart using Data from Our-World-in-Data illustrates that Singapore was able to use the latest ART testings strategy to successfully detect about 5,000 cases a day on 27 October.  They have not only reduced the frequency of PCR testings but also did it without using mass testing and other methods.  Thousands were found with no or mild symptoms.  The chart shows clearly that the infection rate increased in tandem with the increase in the positive rate in testings;  at the same time,  the testing rate was declining.  The positive rate went up 18 times from about 1% to about 18% with a 60% decline in testing rates.  This is not possible without the help of ART testings.


Note:  Positive Rate is the % ratio between Confirmed Case over the number of tests carried out

2) Rapid Increase and falling in Covid cases

Our World in Data compares countries in terms of how rapidly a country's Covid cases have doubled.  Singapore came second next to Barbados,  doubling the cases in 35 days.  Although there was no report in our World in Data about the rapid fall in Covid cases,  Singapore just announced to say that the new cases were only 1,723 on 14 November.  They managed to cut down by half the number of new cases from the record of 5,000 new cases on 29 October.  That is in less than 16 days.  


What Others Are Still Doing


The attached Appendix is showing some examples of what other countries are now doing to flush out the "Silent Covid Spreader".  Although some ideas like mobile testing are good, it is doubtful it will be as effective as giving out free ART Test kits idea.  

In Conclusion

We are of the view that this sudden increase in the infection rate in Singapore is mostly due to the Government's latest move to make self-testing mandatory.   It is good,  timely, efficient, and cost-effective.  

The "Silent Covid Spreaders" in the Community must always be flushed out as much as possible to stop Covid from having a chance to spread and grow stronger every day.  Singapore should be able to see very low new cases very soon.

3)  Update: 11 December 2021

This updated chart taken on 11 December shows that Singapore was able to tame the Covid in about 109 days;  this is less than half of the ttime taken by its neighbour,  Malaysia.  Both Malaysia and  Singaopre are having predominantly the Delta variant.   

The  abundant use of ART test kits must have help Singapore to achieve this better than expected results.




2) Update: 8 December 2021

  • Individuals getting tested will likely not know which specific variant of the virus they have based on a basic PCR or antigen test.
for more information:  Read here


1) Update 28 November

South Africa Adds Antigen Test

South Africa Health Authority found 20,000 new cases by Nov 8 and this is about 26% of the 75,000 Antigen tests (ART) done.  They are now adding Antigen testing to the National count.   They said " Analysis of the mutations in the nucleocapsid (N gene) of B.1.1.529 viruses suggests that rapid antigen tests should be unaffected, however, verification of this is underway."

References:


Appendix:   What others are still doing



Why UK's Vaccinated Has Higher rate of Infection than the Unvaccinated?

10 October 2021

Jump to 

1) Update : 13 December 2021

Introduction

The UK Heath Security Agent (UKHS) has regularly published COVID-19 vaccine surveillance reports weekly.  In its week 42 report,  it attached this table:

It also attached this chart



What Could be the cause?

UKHS explained that it could be due to a variety of reasons, including differences in the population of vaccinated and unvaccinated people as well as differences in testing patterns.  But what exactly does this mean and why does this happen?

What does it mean and Why?

The infection rate discrepancy between the vaccinated and unvaccinated always happen and is commonly found when the majority of the population is vaccinated.   This also happened recently in Singapore.  The Singapore Authority had to stop publishing such information in late September when such data become meaningless and misleading.   We are not comparing the effectiveness of vaccines.

To understand why it happens,  lets us examine a simple and extreme example.  Imagine we have a population of 10,000 people.  9,000 are fully vaccinated and stay active with constant human-to-human contacts and interactions.   The other 1,000 are unvaccinated and always stay in isolation or in a rural area away from busy streets.  In this case,  it is always likely that the rate of infection of the vaccinated is always higher than the unvaccinated in this population.

If we must compare the vaccine effectiveness,  we must make sure the comparison is always done on the fairground.  We must know if the vaccinated and unvaccinated are exposed to Covid on an equal and fair basis.   This is only possible only when the unvaccinated are not aware they were not vaccinated.   

This was exactly what the vaccine manufacturers had done when they first carried out the vaccine efficacy test earlier.  Then,  all participants were jabbed;  half with vaccines & others half with placebo.  The unvaccinated always thought they were vaccinated  They were expected to behave the same when they returned back to the community.    

Using the raw real-world data,  the remaining few unvaccinated,  knowing they are more vulnerable,   will always take extra precautionary steps to prevent themselves from exposing themselves to Covid infection.  If we were to use such raw real-world data for comparison,  we are actually not comparing vaccinated against unvaccinated but other things like vaccinated against the various Covid control measures. By using the same argument,   if the vaccinated were to take the same and stringent control measures as the unvaccinated,  quite sure the results would be much different.

Then How Do We Rate them?

When a situation like the above extreme example was to happen and we must rate them,  a fairer rating system is to compare the rate of infection (or the attack rate) of the vaccinated against a known benchmark,  An example is shown on this webpage.

In Conclusion

It is always important to know what we are comparing.  Sometimes, it is better to omit and ignore such data instead of comparing them and getting meaningless results or answers.



back to top
Update: 13 December 2021

One can always take all extra precautions to avoid being infected but one cannot cheat death.  This superimposed chart from Our-World-in Data shows that the unvaccinated has 5 times the death rate compared to the vaccinated.  The ratio was 8:1 at the peak just a week ago.



References:



iPhone and iPad: How to Create a Short Cut in Home Screen to Clear Cache & History

23 November 2024 What are Cache and History? Cache and browser history store information about websites you've visited.  The C ache s to...