Category: solar

Since I got a new inverter, I have far better logging of the power output of my solar panels, even on my phone :D

I have a pretty small, 2.1kwp (10 panel) ground mount array in my driveway. Its partially shaded at certain points of the day and year, far from ideal. Nevertheless it looks like we are producing about 44% of our August energy consumption from our solar panels.

Thats better than it sounds, because our electrical consumption is relatively high due to

a) Working from home

b) Having an induction hob electric cooker and

c) Having an electric car that charges from home.

We use about 514kwh of energy in August, our peak is about 800 which is January, and probably due to some electric heating in certain rooms, and more hot food I guess.   If we had a new house, with better insulation (this one is insulated as much as it can be given its structure), and larger rooftop solar with zero shading, I reckon we could probably hit 100% renewable in the summer months. Why new-build homes are not mandated to include solar panels is a mystery to me. Its just such an obvious thing to do.

I have friends all over the political spectrum. Some of my friends have other of my friends on blocklists. I’ve seen the most antagonistic yelling between people I know on twitter many a time. I recently sat and chatted to an older friend who said stuff that would make my more liberal friends spontaneously combust (they meant well…attitudes change over the generations). When I was young (teenage) i was VERY left wing. Now…I describe myself as a liberal capitalist environmentalist. I feel I can criticize and support positions from all over the spectrum. I don’t feel a need to pick a ‘team’.

So… Theres something I often feel like yelling at my more liberal, left-wing, right-on socially conscious buddies, but I never do it to their face because…I’m actually a fairly agreeable non-conflict person most of the time in real life. So here goes..

FOR FUCKS SAKE STOP FLYING.

Now for the nuance…

If you read my blog you will know I’m a pretty passionate environmentalist, a big fan of electric cars and solar power (and wind power). I invest in a lot of green tech, and I try to be as green as I can in the way I live. This is not without its struggles. On the one hand..I am not a vegetarian…on the other hand, I have no kids, and I drive an electric car. I added it all up once and I’m definitely carbon negative. I’m offset up to my eyeballs, so I shouldn’t feel bad about my own impact on the environment. I recycle, I have LED lightbulbs everywhere, yada yada.

The thing is, a lot of my liberal buddies who also recycle, who also have LED lightbulbs, who also think renewable energy is a good idea, and also say they care passionately about the problem of climate change turn into absolute hypocrites the nanosecond there is an excuse to jump in a plane. Not only do they all fly places without giving it a second thought, they seem actively CONFUSED when you point out that regular plane trips are pretty much the most environmentally catastrophic thing you can do. To put it bluntly, you can wear vegan shoes, only ever eat avocados, and contribute $5 a month to greenpeace all you like, but if you make unnecessary plane trips you undo that good work about a billion times over.

Some stats: (source: https://www.carbonfootprint.com/calculator.aspx and others)

• A return flight, economy class, from London to San Francisco: 1.38 tonnes of CO2
• 10,000 miles in a 1.5 liter car: 2.61 tonnes of CO2
• Eating a cheeseburger every day for a year: 1.58 tonnes of CO2
• Using aircon all year round:  1.44 tonnes of CO2.

Now obviously you may use more aircon, or less aircon, and you may eat lots, or very few cheeseburger, and you maybe drive a bit less or a bit more, but what people seem to forget is that every time you do a transatlantic flight, that’s the equivalent of 365 cheeseburgers. Your vegan car seats and fondness for avocado go straight out the window if you take just a single transatlantic trip. Instinctively, people are aware that flying is ‘bad for the environment’, but the true scale of it is never acknowledged. The next time you book a flight, realize that climate-change wise, what you are doing is effectively whacking the aircon to max, or stuffing down daily burgers for a whole year.

Now..I’m not exactly untouchable here, as I fly across the Atlantic myself, although I try very hard to absolutely minimize it. I have gone to GDC each year for the last few years, and gone on holiday in south America (and soon will go on holiday to Canada). I do fly a LOT less than most people in my position. I’d never fly domestically in the UK (hey..we have cars and trains!) or France, Germany, Belgium etc. We can drive anywhere in Europe. If I go to GDC I will not fly to any other trade show. I’ve never been to PAX or DICE or to Gamescom. I go to EGX, Rezzed and the PC Gamer weekender sometimes (all drivable). Thats more than enough.

And where possible, if  I can combine one of those biz trips with a holiday, I’ll try and ‘get the most’ from my flight. When I went to Detroit to visit a car factory, it was on the way home from GDC, for example. (with a pit stop in new york to see a friend).

So I’m not saying *do not fly* as much as I’m saying ‘for fucks sake, only fly when there is no other option’ along with ‘think about the consequences a bit more’. I’m lucky enough to be in the position that I could fly to the Caribbean once or twice a year for a weeks chilling out. I LOVE the Caribbean, and the ONLY reason I dont do it is because of CO2 emissions. Those two schools we built/are building in Cameroon? I’ll never see them. never. I can’t justify the flight. I understand why people who dont believe in climate change fly everywhere. What I dont understand is why people who claim to understand it, be concerned about it, and keen to do something to prevent it, think that they can ignore it when they want to jump on a plane.

You really cant.

A worry a damn lot about climate change, and 97% of scientists are scared to death as well. if you are not, you should be. I really don’t want to contribute to the problem, so what can I do? The best figures I can find show that the average UK household emits 8.45 metric tons per year per person, so our household is emitting on average 17 tons. We have lots of home PCs, and our house is sadly not as insulated as modern ones (its as insulated as is practical), so lets round that up to 20 tons. My risk adjusted life expectancy is 87 years, so I have about 40 years to go, which very crudely puts my remaining CO2 emissions at 800 metric tons of CO2. Can I offset all that?

Current prices put the price of carbon at about 7.7 EUR per ton, so to offset all my future expected production would be about EUR 6,160. This doesn’t really sound too bad at all, and i suspect its not close to being accurate. After all, this would cost me a mere EUR 2.92 a week. If the cost of taking us to zero carbon was this cheap, we would be done by now.

Clearly the real cost of damage done by CO2 is way, way higher, and current carbon pricing is a joke. Sure enough, scientists have suggested the true cost to be more like $220 a ton, making my lifetime future emissions closer to $176,000, a much scarier figure, although thanks to my luck with the world of video games, not out of the question at all.

If I was to commit to spending 176k over 40 years ($4,400 a year) to negate my carbon output, what would be the best way to do it. I can think of various answers.

Firstly, I could simply buy carbon offsets. This is the simplest and easiest system, just send people a check, and they plant trees. in theory simple, although I would want to be EXTREMELY sure that those trees were actually planted, that they were not going to be planted otherwise, and so on.

Secondly I could invest in renewable energy that generates enough power to offset those emissions. A 500kw wind turbine generates roughly 1,800MWh per year. Apparently 1 kwh is the same as 0.14kg of CO2 currently in the UK so errr… 1,800,000kwh is effectively offsetting 252,000 kg of CO2, or roughly 252 tons. Thus I need about 3.5 years output from a 500kw wind turbine to have my household be carbon neutral. Generally speaking you expect these things to last about 25 years, so by again, crude methods, we can say that I’d need to own 14% of a 500kw wind turbine to be totally neutral. I currently own (through abundance) 7.14% of this turbine:

(technically not owned, but am entitled to income from it due to ownership of debentures etc…) Which means I’m actually half way there just with this turbine. A bunch of other investments, including solar, geothermal and tidal means I’m definitely already there…

I’m such a big fan of renewable energy that even before typing this, I was pretty sure I was carbon neutral, but starting to do the sums and look at the investments convinces me I’m massively carbon-negative, even if I fly to the US once a year, and leave my PC on all the time (which I don’t :D). Having said that, a flight from London to San Fran, business class, is about 6 tons, so not to be sneezed at, as it represents a 75% increase in my annual emissions. FWIW, the same flight economy class is 3.3 tons. If we were pricing the CO2 from flights accurately, the climate surcharge for economy flights would be about $726, and for business it would be $1,320.

Maybe if sales are good I should do my own offsetting for future flights, I never trust the airlines to really do it anyway, and reflecting the true carbon cost feels better.

Food for thought :D