No, the wind analysis was not reasonable for the time - he used data from a previous generation of turbines (and in turn, the next generation of turbines were certain to be 40% bigger & etc.), from a wind farm that had quite flukey winds.
I saw him present 18 years ago, and asked him why: he said that he didn't want to rely on any predictions or models, but only discuss real data. Which is sort of defendable as a position, but ignored the fact that renewable energy was progressing so incredibly fast, and that these engineering predictions were not speculative but very much concrete.
Similarly the silicon solar panel industry in 2008 had a roadmap to get to £1/Wp over the next few years (which they did, and which led to the ~2012 explosion in solar installations), by mass producing the 'expensive' ~20% efficient (mono-crystalline silicon) technology.
Mackay uses a 10% figure throughout.
So overall this was a bit like making predictions in the year 2000 assuming everyone will be stuck on 56k dial-up forever, because most people are on 56k dial-up.
These biases are present in all of the discussion of renewable technology, yet nuclear gets a free-ride / magical thinking in terms of uranium extraction, waste disposal and cleanup.
And then there is the persistent obsession with land use in the book.
This led me to the conclusion (which I still hold) that this was an example of the tail wagging the dog: David MacKay wanted the 'obvious' physicists answer of nuclear power to be the natural conclusion, and by construction made it so in his book. Just because you are a Bayesian does not mean that you are unbiased!
David MacKay was an amazing scientist, but I do not think this book is accurate (even for its time), or that useful in public understanding of what we now call 'Net Zero'. It certainly popularised the idea of actually thinking through individual energy budgets, which can only be a good thing, but it was a massive missed opportunity to treat heat (chemical) energy (maximum entropy) and electrical (which can directly do work) as equivalent, just because they have the same unit.
Later on, as the 'Climate Tsar' he made a web app where you could play with the future balance of generation with a simulated model of the UK, and set your own costs for the different technologies, which I thought was much more useful. You could choose your own energy mix, and understand some of the tradeoffs.
And yes, very sad that he died so young. In the context of this book it would have been interesting to see how he dealt with the increasing mismatch of reality and his predictions as time passed.
Just before he died in 2016 he gave an interview "revealing" his true thoughts on the matter but I think like you say it came through obviously enough in his work:
> There is this appalling delusion that people have that we can take this thing that is currently producing 1% of our electricity and we can just scale it up and if there is a slight issue of it not adding up, then we can just do energy efficiency,” he said. “Humanity really does needs to pay attention to arithmetic and the laws of physics – we need a plan that adds up.”
> Prof MacKay had previously avoided being drawn into the political debate about energy, but told Lynas: “I have always tried to avoid advocating particular solutions but maybe because time is getting thinner I should call a spade a spade.”
> The key for the UK, he said, was a zero-carbon solution that works in the winter, when energy demand is highest but sunshine is lowest and winds can drop for days at a time. “The sensible thing to do for a country like the UK, I think, is to focus on CCS, which the world needs anyway, and nuclear,” said Prof MacKay.
> The decision on a new nuclear power plant at Hinkley Point, which the government hopes will be the first of a new generation of plants, has been delayed until September.
> “Then if you ask what is the optimal amount of wind and solar to add in then the answer is going to be almost zero,” he said. “I love wind turbines – they are the cathedrals of the modern age – but they are a waste of money if you have a low carbon solution that gets you through the winter … because when the wind blows you are going to have to either turn them down or something else down that you have already paid for like nuclear or CCS.”
Maybe he would have changed his mind as prices and delivery timelines diverged but many of the people who were most enthusiastic about his work because it reflected their nuclear preference didn't, so who knows.
Though maybe his kind of person that liked nuclear and heat pumps and EVs all just changed their mind based on new evidence and we are left with the people who mysteriously like nuclear but don't want to use the output for heat and transport.
I dunno, I flew UK-IRL this summer and in both directions I just threaded the baby-belt (standard issue here, the cabin crew hand them out before the safety briefing) around the carrier and the sleeping baby.
In a full on crash situation infants are not going to do well, so optimising for much more likely turbulence injuries (for which having the baby strapped as securely as possible is definitely a good idea!) seems more important.
These approaches always measure the wrong thing though - the average carbon cost of electricity.
What you need to know is the marginal carbon cost, which will be much less variable as almost all dispatchable generation is fossil.
So yes, you should avoiding adding load when there is a severe supply crunch and the marginal power is generated by gas peaker plants (often gas turbine based), and use power when renewable generation is otherwise being curtailed, but most of the time the grid is firmly in the middle regime with a fairly average marginal cost.
The statement that electric pressure cookers measure pressure absolutely (i.e. not relative to local pressure) was news to me, and definitely a good hack to know if you're living at altitude.
Electric cookers don't "measure" pressure. They are thermostatically controlled via a sensor touching the bottom of the bowl and, because they are sealed, that temperature directly translates to the same pressure no matter what altitude you're at.
The temperature at the base of the bowl is close to the temperature of the mass of liquid / solids inside and at the base of the bowl, sure.
I'm less certain the same transfer function always returns the gas pressure at the top of the sealed bowl "no matter what altitude you're at" considering that at the starting point, when first sealed, ambient room atmospheric pressure varies with altitude: for the same initial food mass to be cooked the standardised gas volume included will vary with altitude.
(Alternatively, no matter the altitude, there's always a constant volume to fill with atmospheric gas .. and the mass of that gas will vary with altitude)
For my textbooks, I use little record cards. I write the book reference on the top line, then whatever notes or quotations etc. If it's a heavily referred to book, I sometimes use different colour cards to mean different things.
When I return the book to the library etc., I take all my record cards out and put them in a little perspex index box.
Sometimes I use the record cards to then start some more detailed notes in a notebook; sometimes the record cards refer to a page in my notebooks where I've attempted a derivation etc.
I saw him present 18 years ago, and asked him why: he said that he didn't want to rely on any predictions or models, but only discuss real data. Which is sort of defendable as a position, but ignored the fact that renewable energy was progressing so incredibly fast, and that these engineering predictions were not speculative but very much concrete.
Similarly the silicon solar panel industry in 2008 had a roadmap to get to £1/Wp over the next few years (which they did, and which led to the ~2012 explosion in solar installations), by mass producing the 'expensive' ~20% efficient (mono-crystalline silicon) technology. Mackay uses a 10% figure throughout.
So overall this was a bit like making predictions in the year 2000 assuming everyone will be stuck on 56k dial-up forever, because most people are on 56k dial-up.
These biases are present in all of the discussion of renewable technology, yet nuclear gets a free-ride / magical thinking in terms of uranium extraction, waste disposal and cleanup. And then there is the persistent obsession with land use in the book.
This led me to the conclusion (which I still hold) that this was an example of the tail wagging the dog: David MacKay wanted the 'obvious' physicists answer of nuclear power to be the natural conclusion, and by construction made it so in his book. Just because you are a Bayesian does not mean that you are unbiased!
David MacKay was an amazing scientist, but I do not think this book is accurate (even for its time), or that useful in public understanding of what we now call 'Net Zero'. It certainly popularised the idea of actually thinking through individual energy budgets, which can only be a good thing, but it was a massive missed opportunity to treat heat (chemical) energy (maximum entropy) and electrical (which can directly do work) as equivalent, just because they have the same unit.
Later on, as the 'Climate Tsar' he made a web app where you could play with the future balance of generation with a simulated model of the UK, and set your own costs for the different technologies, which I thought was much more useful. You could choose your own energy mix, and understand some of the tradeoffs.
And yes, very sad that he died so young. In the context of this book it would have been interesting to see how he dealt with the increasing mismatch of reality and his predictions as time passed.