Or here!

Just to crib Jan's great chart here a little bit - here are just a few of the headlines that came out when growth somewhat slowed in 2024

Many, many media outlets do not really know how to handle technological change like this

For the first time ever, heat pumps outsold gas boilers in Germany in 2025.

48% of all new heating systems installed last year were heat pumps. Gas fell to just 39%. A decade ago, heat pumps had a 7% market share. The transformation has been remarkable.

Iran War Live Updates: Trump Calls to Wipe Out a ‘Whole Civilization’ as Iranians Reject Threats

One is reminded of the story of King Croesus, who, before attacking Persia, consulted the oracle. The oracle told him that if he proceeded, he would destroy a great nation. What Croesus didn't realize was that the nation would be his own.

AI LLMs can generate slop, but they can also debunk AI-generated slop! I couldn't verify any of the below, so I asked ChatGPT. Answer: Japan has not built 3,200+ km of solar canopy for the Shinkansen. The image is AI slop. There are no credible engineering, gov't, or company sources for any of this.

Thousands march against far right in London in biggest ever multicultural protest More than 100 charities, campaign groups and trade unions marched in London in a show of unity against far right politics

Meanwhile in the uk www.theguardian.com/uk-news/2026...

Heat pumps: a user survey Understanding the experience of owning a heat pump

By modern I mean one using the modern R32 and R290 refrigerants, because these have produce water hot enough to not need a resistive heater to pasteurise the hot cylinder. Satisfaction with heat pumps is high in Europe. www.nesta.org.uk/report/heat-....

The heat provided by a heat pump is a combination of the electrical power used drive the compressor and the energy harvested from the environment. There is no pure resistive heating element in a modern heat pump install.

Nope. Good only fashioned coding. Try it.

Prices have keep falling at a predictable and staggering rate.

No idea and I’m not sure how I could measure it. The thing I was very careful about was trying to get almost the max number of panels on each string to ensure they function as well as they can in low light conditions. They do very well like that.

Actually… it’s 13kWh!

Use this. It’s so good I’m going to support them on Patreon. Here’s as much of the script as I can fit on a screen grab sankeymatic.com

Forgive me if this is getting repetitive, but this is the first time creating sankey diagrams.

Here’s latest take showing energy flows in my 100yo house in Suffolk UK with heat pump, 14kW east west PV array, 13kWh battery & EV. Net cost of electricity for month was £44. Mean temp for month was 8°C.

To be clear, that was the cost of the pv system. The battery was separate and cost a bit under £5k. However.. see my suggestion to hold off buying a battery for a year or so because the costs are coming down faster than any likely savings in that period.

Compare that to what we used to use in March back when we had a gas boiler and petrol car. We purchased 5 times as much energy overall, harvested none from the environment and sold nothing back. The losses from this approach are great than our purchases today!

Another look at the energy used by our 100yo house in Suffolk this March so far. We have a 14kW east/west PV array, 10 kWh battery, EV & heat pump. We used 2,500kWh of energy, but of that we only needed to buy 612kWh and we also sold back 345kWh. Here are the energy flows:

10kWh. My general advice is that m it might be better to hold off getting a battery for another year cos batteries are both getting cheaper and commodified very quickly. Savings from having battery for next 12 months might well be much smaller than the reduction in cost a unit in that time.

And … panels guaranteed to deliver over 89% of stated output after 25 years!

£7k, but… house was fully scaffolded anyway because we were painting the exterior, and I took down a redundant chimney stack that was in a bad state but also would have caused shading. I did that myself so that didn’t add to the above price.

? No idea. I have shown the losses between charging energy and delivered energy.

Suffolk. So yes, more sunny but still works pretty well on cloudy days.

Energy cost for us for the month was £44 plus £15 standing charge. (14p per unit for purchased electricity on Cosy and 12p refund for electricity sold back to grid).

Here are energy flows for our 100 yo house for March so far. Solar generated 80% of requirement (heating, hot water, cooking, car etc) and with smarter control of the battery we could have been more self sufficient. I find this utterly amazing. 7kW one each of east and west roof faces.

36 off 600W panels for £2,100. Again, works out at 10p watt.

Any restriction on putting in multiple systems. Ie 3 for total of 2,400W?

Agree entirely. FYI the panels themselves are 10p per watt at trade prices. (£54 for a 540w panel). To had a massive 14kW system installed last summer for £7k, ie 50p per watt including inverters, installation and MCS. Had scaffolding up anyway for decoration which helped.

It all felt very coordinated. Interesting that it was apparently illegal! Why oh why did Vaillant need to participate in this! FYI @chrisnelder.bsky.social

So a bit of insulation above the slab slows the release of heat thereby avoiding overheating in the short term. That makes sense and really useful to understand. Thanks.

And also in grey.

The first one was wrapped off site before install which was a logistical nightmare. The second one was wrapped on site at the end of the install. So much easier and also avoided any risk of wrap getting damaged in transit or during the install.