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John French at STAND's avatar

Thanks David for a fascinating insight into real world solar energy production. I have lived through many phases of technological advance, from the 1940's onwards, and in many cases the existing technologies, because of the huge investments that had been made in them, are a drag on new technologies. The classic example is the motor car. At the turn of the 20th century electric runabouts were more popular in some parts of the US than combustion engines, but partly due to the abundance of gasoline and the lack of electricity production, the combustion engine won out. Later in the 20th C electricity production and battery technology improved to the point where electric cars were viable, but by that time the enormous investments in oil production and car manufacturing meant that these investments had to be protected in the name of capitalism. Whatever you may think of China politically, its central planning system means it is racing ahead in terms of renewable energy production and electric cars. Why? Well why wouldn't you, if you do not have shareholders and investment banks to satisfy. It's much cheaper and easy to do because the economics are de-coupled from capitalism. Yet the UK government ploughs on regardless with building enormous nuclear power stations which will continue to hold back the rise of cheaper renewables, for a while at least. But the sheer economics of renewables will win out in the end and we will look back on the 2020s as the era that UK wasted hundreds of £billions of our money on a hopelessly antiquated and expensive technology.

Ken Fabian's avatar

Thanks David.

In Australia we might count the number of homes with PV on their roof (about 1 in 3 and rising), sometimes with estimates of their combined Peak power and possibly referencing their capacity factor but a lot of focus is on how much of grid supply is PV and last year's 15% of grid was supplied by rooftop solar - which is the leftovers from rooftop solar after the PV powering the homes and businesses. The contribution to the grid is counted; the reduction of demand from the grid - the 'behind the meter' portion - rarely is.

RE accounted for above 40% of grid supply last year and no-one is adding anything else anymore - beyond a single gas power plant that was a fully taxpayer funded anti-renewables 'statement' by a previous climate science denier Australian government and only now being brought into use. Far more RE capacity has been added during construction than it can supply, even running full time... which it won't.

The balance is changing fast from current rapid uptake of batteries, which might reduce the contributions to the grid from existing rooftop solar but probably won't as new household solar installations get larger; the 'behind the meter' portion is growing. I am not convinced that is counted properly. More grid supply (power available) is being added via batteries than by new solar and wind right now, but I expect the combination will only boost further investment.

I am beginning to think that keeping up the rooftop solar installation rates is not an urgent issue - they've never been higher - but the emerging issue, rarely acknowledged yet, is when they will top out and solar installers will turn to upgrade, repair and replacement.

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