My Power Profile. What’s Yours?

By Nick • Energy • 24 Jul 2011

In my earlier post I looked at the overall energy/power profile of the world. From that big picture view I decided the next logical step was to take a look at the personal perspective on consumption. I’ll take a look at where all this energy actually comes from in a later post.

Personal consumption is an important factor, as we could undoubtedly reduce our collective energy burden by each using less of it. Obviously we don’t want to sacrifice some things. For example: I am attached to food and am reluctant to stop eating it altogether. Likewise, it is good to stay dry when it rains and warm when it snows, so I’m quite fond of my house. But what if there were things we do that use a huge amount of energy and we can give up with a relatively small sacrifice… or better still things that we can do differently, saving energy, while making no sacrifice at all? To find these opportunities requires getting a handle on our personal energy use, as only we as individuals can assess those things which are important to us vs those things which aren’t.

Granted, it was slightly drier *inside* the tent.
Great as an adventure… less great as a way of life.

I talked in my earlier post about the significant of embodied energy. Remembering that, what should we focus on most and first? Does unplugging your mobile phone charger from the wall when you’re not using it really make a difference? Or is it just the tiniest drop in the bucket – still worth doing, perhaps, but potentially one of those trees that stops you from paying attention to the rest of the forest.

What’s the answer? I had some ideas (for example, I never paid much attention to my mobile phone charger), but I certainly didn’t know for sure on the big topics. And I’m an engineer, and have been working on energy systems of various descriptions for coming up on a decade. I want to sort these questions out to have a personal baseline to start this journey from, so I turned to the internet… and to (among other things) an interesting website called ‘Wattzon‘ created/imagined largely by Saul Griffith. Saul Griffith is a bit of a superstar on energy and tracking thereof – see his excellent Long Now talk here… though be warned, it’s long and goes into a lot of detail, more of an “extra reading”(/listening and watching) link.

WattzOn, despite having a dorky name with a ‘z’ instead of an ‘s’ (Saul is a legend, but he was also born with Australianism), is pretty cool. It allows you to create a composite of your travel, your eating, your commuting, your living, and all your stuff… and gives you an average power consumption figure that reflects all the energy tied up with it (Remember power is a measure of energy delivered in a certain time – 1 Watt (Power) = 1 Joule (Energy) every Second (time). To give a non intuitive example that illustrates the concept: creating the computer on which you’re reading this might have taken around 1GJ (One Billion Joules). Making it, not running it. So, if that laptop lasts you three years before you buy a new one and ditch the original then we can say that your laptop is the equivalent of around

Laptop: 10.5 Watts = 1,000,000,000 Joules / 94,608,000 Seconds

(94,608,000 is the number of seconds in three years)

Your laptop uses power also when you have it switched on – that’s extra, and shows up on your (or someones) power bill. If your laptop uses around 60 watts while it’s turned on, then even if you use it for four hours a day, replacing it once every three years means that the same amount of energy went into making the laptop as went into running it. Surprising? It was for me.

Getting into the meat (or the organic soy-derived meat substitute) of the personal energy topic: Where does my energy go? I entered everything I could think of, to the best of my ability, into WattzOn. WattzOn leaves out a few important things in its basic graph which I’ve added as estimates[1].

 Mash it together and we get:

My Power Profile: 2010

In the words of the aforementioned SaulStralian: “I’m a planet Fucker”.

I was a little surprised to be a planet fucker. I mean sure, I live in a rich prosperous nation, and hence naturally consume far more than the global average – The Government uses almost ten times the Bangladeshi  per-capita average just on my behalf. But the nation is Switzerland. Public transport here is amazingly good – I don’t even own a car. I’m using the numbers from last year as I want to compare them to this years, so I was still eating a reasonable amount of meat, but certainly a lot less than “average” (which you’d understand if you’d seen the prices in a swiss supermarket). Our house is relatively small, and has triple glazed windows. Why am I a planet fucker? If I want to consume less, what can I sacrifice?

I’m now a mostly vegetarian (I eat a serving of meat maybe once a month – I miss it occasionally, but only a bit; mostly the change just made me a better cook!). I can commute less (right now I travel approximately 200km each week by commuter rail to get to and from work). And I can perhaps reduce some of my workplace consumption and home consumption (I’ve been conservative on the high side here).

The graph shows quite clearly where the worst of my excesses come from. Last year I flew around 140,000km. That’s like flying all the way around the world 3 and a half times. And it shows. Another big chunk is government services (roads, sewers, cleaning, parks, police, hospitals, army). WattzOn uses a fairly coarse method to estimate this, but it’s perhaps within the ballpark. It’s clear where the big gains are to come from though – a lot less flying (or much more efficient flying). Trouble is, my family live in New Zealand, and I like seeing them, so I want to be able to make at least one trip every two years. In today’s aircraft, which burn kerosene and will continue to do so for a fair while the way things look now, even one trip every two years will be in the range of 1,300W! But I’ll try to get down to that first.

I’ll start to explore the significance of these numbers later, but for now: That’s my power footprint. The goal for now is to get from 13,947 Watts to below 2,000Watts (or to find a wonderful, sustainable, low impact way to make a lot of energy).

Why am I targeting 2,000 W? Because that’s the global average today. Since there are, for example, ~165 Million people in Bangladesh with a per-capita consumption of 300W and living, on average, lives of extreme deprivation (health, food, water, housing, etc), and since our global energy use is already grossly unsustainable with the current methods of generation, I figure I’ll try to meet the Bangladeshi’s halfway until we’ve worked out a great way to make more clean, sustainable energy for everyone.

300W is the average per capita... but that doesn't mean the amount the "average" person receives for their own use. These ship-breakers get a lot less - climate change probably isn't their top concern.

13,957 Watts – that was my average power consumption last year. Take a look at WattzOn – what was yours?



There are a lot of simplifications and assumptions in these estimates. They’re not going to be on the nail, and some might be off by quite a bit. That’s why it’s a first step – let’s go with it for now, the accuracy will improve in time and the underlying message is still probably sound.

Footnotes    (↵ returns to text)
  1. Embodied energy of house, embodied energy of office, and energy used at office) based on this (combined with the anecdotal “family home” of 300MWh) and the observation that my work is a lot like my home… only less comfortable and colourful. I decided that our 80 square meter apartment (shared with my fiance) in a multilevel building was around 100MWh and had a 50 year life, giving 230Watts/2 people = 115W for me. Office assumed the same as home, both for building and heating.

Our Energy System, Our Lifestyle

By Nick • Energy • 6 Jul 2011

“Energy” has become such a hotly debated topic lately that I suspect many people are getting pretty exhausted by it, especially considering the ongoing lack of any clear concensus over how to move ahead. This is a real pity, as our energy system is a big deal when it comes to the lives we have and the future we want… and despite the lack of agreement on the solution, there is definitely broad agreement that we have a big problem today!

Energy is important – our ability to control it grants us many of the comforts and luxuries we enjoy. Simultaneously, however, our decisions on what we use (and how) can have long-lasting impacts on other comforts and luxuries equally dear. Getting the energy system right will be a giant step towards a bright future for the planet. Getting it wrong could easily lead to disasters as it has in the past, though the disasters of the future will likely be much larger if we make bad decisions.

Deepwater Horizon Aftermath. Oops.

Consumers of energy and services, such as yourself, collectively wield most of the power in determining what the story of this century will be in energy use. As a result, you’re targeted endlessly by energy lobby groups, energy suppliers, environmental organisations etc trying to influence your decisions. This is why I’m targeting you as well :-) Hopefully my interests are closely aligned with yours, however. whereas the interests of most energy lobbyists are not!

In the eyes of children, energy must seem quite abstract. Electricity particularly is usually invisible – it comes from the wall when you want it. Gasoline at least has mass and odour. But does a house itself use energy? Did the car use energy before it was first filled with gas? Does food? Not while you’re watching them, but in actuality energy is tied into almost everything we interact with.

In fact, the energy used as electricity from our wall sockets is actually a pretty small fraction of our overall energy use. The breakdown is roughly as shown here:

15 TerraWatts (Power) = 131 PetaWatt Hours (Energy over a year) = Rate of energy release of the detonation of a nuclear bomb large enough to destroy a city (1MT)... every 5 minutes .

The above diagram is derived from figures reported for 2010 by the IEA. ‘Industrial’ includes agriculture, construction, mining, and manufacturing. Transport is both personal and commercial. Residential and commercial is primarily heating, lighting, and appliance use. This chart has been drafted from fairly coarse data with a fairly coarse brush – I’ll delve deeper and perhaps refine it in the future, but it will serve for now. Overall, our global society used around 131PWh in 2007 (we may have actually dropped a few percent since due to the economic recession). A useful conversion into Power rather than Energy gives an average power draw of around 15TW[1]. Power is Energy per Time. Specifically, a Watt (Power) is a Joule (Energy) delivered in a Second (Time); but power is also useful when we want to monitor the amount of energy delivered every year, as in this case.

The key thing to take away from this chart, more relevant for now than the exact numbers, is that:

  1. Much energy use is indirect – by living in a house, eating food, using roads and other infrastructure, buying appliances, owning a boat, or by using electricity where much of the energy is lost before it gets to the point of use.
  2. For most people the energy used indirectly as embodied energy tied with some other service or good is more than the energy you buy directly as kWh of electricity or litres of oil!

So: Energy plays a big part in all of our comforts and luxuries – not just making our cars move and our lights and TV run when we flip the switch. But is the standard of those luxuries proportional to the amount of energy used? Put another (more simple) way: do our lives get better as we use more energy? This is an important question – as long as energy is a limited resource (and it’s safe to assume it always will be) we should try not to waste it. If it’s possible to have a high standard of living with reduced energy consumption then we’d have a smaller problem to solve.

In considering this issue, it’s interesting to look at some statistics for energy use vs ‘life quality’ at a national level, allowing us to compare different situations. I’m using data from, because they create the graphs automatically. For now I haven’t worked out how to change the units and axis, so our energy/year is now measured in ‘TOE’, or ‘Ton-of-Oil-Equivalent’. To convert this to Watts just multiply the TOE/Year value by 1,327 (i.e. 4 TOE/yr ~ 5,300W). Somewhat indicative of quality of life is HDI, or Human Development Index. This doesn’t perfectly capture quality of life (if anyone can suggest what would, let me know!) but it’s a composite that looks at years spent in education, life expectancy at birth, buying power of the average person. One measure – not perfect by any means, but something. Let’s take a look:

Energy Use vs Human Development Index

Click to Open An Interactive Version of This Graph on

Each circle is a country, the size of the circle represents the population of that country. Some you can guess probably, but which is which doesn’t matter for now (though follow the link if you’re interested). The interesting thing is that for our (admittedly imperfect) metric of HDI there is a very wide range of energy use amongst countries with a high score (i.e. high quality of life)… but additionally there are no countries with a high score below a certain energy use.

There are also a lot of anomalies, but in general terms we can say that there seems to be a relationship between our quality-of-life representative value, and energy consumption per-person. For now we can’t draw too many conclusions from this (we don’t know whether using a lot of energy makes your life good, or whether it’s just that people who have good lives tend to use a lot of energy) but what we CAN see is that:

  1. It’s very definitely not random
  2. It’s very definitely not linear

Things will rapidly unravel with uncertainties if we try to draw general conclusions, but lets try for a few basic comparisons:

  • The USA, Germany, and Japan are all modern relatively democratic nations that are highly industrialised, at similar latitudes and have very similar HDI scores. Yet the USA uses twice as much energy per person!
  • No country scores more than 0.8 HDI using less than 2 TOE (though Hong Kong is an outlier on the boundary)
  • Using a lot of energy doesn’t guarantee a high HDI.

There are so many subtleties here that we should leave it there for now I think and perhaps just conclude from our chart that energy is related to HDI, but that it’s possible to have a high HDI without going to 10kW/person (as for the USA).

The trick is balancing our energy use so that we get maximum quality of life both now and well into the future, and that this is possible for most of the people on the planet – not just the top few percent[3]. Trying to do otherwise has caused numerous problems in the past (as with most other constrained resources) and will cause numerous problems in the future.

My opinion is that energy should be:

  • Affordable – This does not necessarily mean cheapest, just that the cost should allow us to enjoy a high quality of life[4].
  • Clean – The life cycle environmental impact should be low[5].
  • Safe – The energy source should not create a significant risk of harm in the short or long term.[6]
  • Sustainable – The energy source should be sufficient to meet forseeable needs for the next 300 years at forecast rates of consumption.[7]
  • Distributed - As energy is so critical to our way of life, it is dangerous to become dependent on only a few very large reserves – this can easily result in volatility and resource conflict. Better to have a widely available resource with few fundamental shortages.
  • Judiciously used – Meeting all of the above is a big ask. One thing we know for sure – the less energy we need, the easier it becomes. We should therefore try to minimise the energy we consume, while preserving a high quality of life.

Over the coming weeks/months/years I’m going to explore some ideas of we might do this, and build a collection of relevant details. With this site I hope to provide a relatively simple resource for people who are interested in understanding the general issues (myself included!) without having to read every news article and listen to every politician and energy company executive. I will also be doing my best to keep the information here honest and accurate – if something changes you’ll see retractions/amendments.

From these humble beginnings…. let’s see :-)



Footnotes    (↵ returns to text)
  1. Unless you are really quite familiar with this field, those are fairly meaningless numbers and fairly meaningless units. There are thousands of different ways in which they’re contextualised - here are a few I like:

    • 15TW is 15,000,000,000,000 Watts… or the equivalent power consumption of a every single person on earth running a large household electric heater, each, 24 hours a day.
    • 131PWh is the amount of energy released by the detonation of a nuclear warhead large enough to destroy a city (1 MT TNT Equivalent)… every 5 minutes… for an entire year.
    • 15TW is the combined engine power output of 37 million Porsche 911 GT2′s running flat out.
    • If we wanted our 131PWh in the form of electricity, it would take roughly 15,000 large nuclear reactors running all the time for a year.

  2. Sure, you could fight to stay in that top few percent yourself… but firstly it’s unethical, secondly you might lose, and finally everyone will lose because – as we see today – people who are deprived tend not to just sit and do nothing. They might attack you. They might burn down some rain forest to keep warm. Either way, what goes around often comes around
  3. An Economist would probably argue that we should use the cheapest source of energy. They’d be right, though only to the extent that all costs associated with a given source of energy are appropriately internalised. For now, at least, they are typically not. A barrel of oil does not have a direct levy for climate change impact, nor for military spending to secure supply lines.
  4. Life cycle environmental impact measures the environmental impact of all phases of an energy source’s life. To take coal as an example; Life Cycle Assessment considers the power plant construction, the mining of the coal, the disposal of the coal ash, the emissions from the plant during operation, the decommissioning of the plant at the end of its life etc. Even such objectively spotless technologies as wind or solar have a significant environmental impact. Solar covers large areas of land, which may be significant. Wind can be noisy/visually intrusive and kill birds or bats. Both wind turbines and solar panels take energy to produce.
  5. Safety is a very tricky thing to properly quantify, and I am not an expert. Suffice to say, however, that all of these nuclear plants were reportedly safe. Risk free energy is perhaps unrealistic – there are multiple deaths each year from solar and wind due to the risks of simply working at height – but these risks are relatively easy to assess and have very limited long term societal impact. The risks of climate change and nuclear disaster are fundamentally different. A big nuclear disaster could have major consequences spanning thousands of years; climate change likewise. When such large consequences and long timeframes are concerned it is no longer sufficient for a system to be ‘safe’ as long as maintenance and supervision is perfect, and no natural disasters occur. It must be safe when maintenance is abandoned, and it is operated by a drunk. If you think this is unrealistic, consider this study
  6. 300 years is simultaneously a very long time and a very short time. It is long in terms of the possible innovations that might occur within this time, hence we could say it’s needlessly conservative. However, planning for less than 300 years seems very short sighted. Longer would be better. I think a good general guideline might be that we could reasonable expect humans to colonise mars before we are close to running out of the energy supply in question.