Time to make 2025 updates to my annual “opinions about solar” thread.
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45. Some governments are definitely out to fight against a better future.
46. Achieving a net-zero energy transition, for most countries, will not look like winning a war or marching into a capital waving flags. It will be the ability to say "no thank you, we do not want what you are selling" to the petrostates, and walking (or cycling, or taking an electric bus, or driving an EV) away.
47. While moving to a circular economy with 100% recycling rates is essential in the long run, it’s not a challenge for PV in particular; few PV panels have been recycled to date only because the vast majority are still in use. It can be, and is, done.
Volumes are still tiny compared with most things we also have to recycle.
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47. While moving to a circular economy with 100% recycling rates is essential in the long run, it’s not a challenge for PV in particular; few PV panels have been recycled to date only because the vast majority are still in use. It can be, and is, done.
Volumes are still tiny compared with most things we also have to recycle.
48. Floating solar, agrivoltaics, balcony solar: yes you can put solar panels on anything that stands still long enough. If you have a lightweight encapsulant, you can also put them on something that moves.
The decision comes down to: in this use case, will the solar panels get in the way, and will they get broken by normal activities?
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48. Floating solar, agrivoltaics, balcony solar: yes you can put solar panels on anything that stands still long enough. If you have a lightweight encapsulant, you can also put them on something that moves.
The decision comes down to: in this use case, will the solar panels get in the way, and will they get broken by normal activities?
49. 'Agrivoltaics' is defined as 'solar that gets preferential legal / permitting treatment applying to agrivoltaics projects' and therefore the definition is local. It's not really a different technology and so a general statement on it is not really possible.
It's harder to harvest crops and work land under solar panels, so many owners may quietly drop the farming bit once support is secured.
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49. 'Agrivoltaics' is defined as 'solar that gets preferential legal / permitting treatment applying to agrivoltaics projects' and therefore the definition is local. It's not really a different technology and so a general statement on it is not really possible.
It's harder to harvest crops and work land under solar panels, so many owners may quietly drop the farming bit once support is secured.
50. Grazing sheep under solar panels should not qualify them for agrivoltaics support. Solar subsidising sheep farming is not particularly an environmental plus.
(Some crops do seem to work well with PV, for example shade-tolerant berries, and in some climates, vegetables for which growth isn't limited by light availability. Farming involves a lot of optimising for local conditions and so often the answer to 'what works?' will be 'it depends....').
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50. Grazing sheep under solar panels should not qualify them for agrivoltaics support. Solar subsidising sheep farming is not particularly an environmental plus.
(Some crops do seem to work well with PV, for example shade-tolerant berries, and in some climates, vegetables for which growth isn't limited by light availability. Farming involves a lot of optimising for local conditions and so often the answer to 'what works?' will be 'it depends....').
51. For 6 years I have been refusing to get excited about perovskites until a perovskite company can disclose a commercial partnership with a named major module manufacturer. They have now. Still not excited.
Crystalline silicon is honestly good enough.
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51. For 6 years I have been refusing to get excited about perovskites until a perovskite company can disclose a commercial partnership with a named major module manufacturer. They have now. Still not excited.
Crystalline silicon is honestly good enough.
52. Get your rooftop solar system built when you have scaffolding up for something else, 'cos scaffolding is expensive. Ideally build it when you’re building the roof, there will never be a better time. Rooftop solar mandates are good but don't do much unless you are adding a lot of new buildings, which most developed countries aren't.
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52. Get your rooftop solar system built when you have scaffolding up for something else, 'cos scaffolding is expensive. Ideally build it when you’re building the roof, there will never be a better time. Rooftop solar mandates are good but don't do much unless you are adding a lot of new buildings, which most developed countries aren't.
53. Anyone buying a new internal combustion car now is silly. EVs aren’t the answer to everything – especially congestion of cities – but they do use much less energy, it's relatively easy-to-decarbonise energy, and, with flexibility, they can support the grid.
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