Five years ago today, we installed solar panels on our house in London. Solar panels are the ultimate in "boring technology". They sit on the roof and generate electricity whenever the sun shines. That's it. This morning, I took a reading from our generation meter: 19MWh of electricity stolen from the sun and pumped into our home. That's an average of 3,800 kWh every year. But what does that actually mean? The UK's Department for Energy Security and Net Zero publishes quarterly reports…