I only now got around to watching the Technology Connections video on renewable energy, I wish I had seen it sooner. Almost feels like it should be required viewing. I definitely thought there were nastier chemicals/compounds in solar panels and hadn't updated my knowledge on them in decades.
I decarbonized my 125 year old home this summer. Cold winters here, using mini split heat pumps now for heat. Previously had oil, and 90 years ago it would have used coal. Love thinking this will be the first winter this house ever had where dirty exhaust wont be going up the chimney to keep it warm.
darth_avocado 1 hours ago [-]
I swapped my hvac for an electric heat pump. My energy usage went down. Because electricity is way too expensive and I’m okay sweating a bit in the summers and wearing jackets indoors in the winters.
abstractspoon 4 hours ago [-]
Unlikely. We'd just use the leftover energy for new things.
3eb7988a1663 2 hours ago [-]
That's not quite what this is about. It is the Primary Energy Fallacy, that if you are to replace eg coal, you need to replicate its original energy content.
If 1kg of coal represents 1000 Wh, your generator loses 1/2 to waste heat, you only generate 500 Wh of usable electricity. Some analyses will state that renewable power has to replace the 1000 Wh of embedded energy within the coal, when it only needs to output 500 Wh.
If you use solar panels and generate 500 Wh directly, you have cut your energy use in half, even though the output has remained the same. An EV has a battery of ~80 kWh, equal to 2-3 gallons of gas, yet it can go a few hundred miles, a 3-4x ratio of efficiency, compared to an ICE.
bitmasher9 18 minutes ago [-]
I think your EV example is a better example than your coal one.
I’ve never seen anyone measure coal power by the amount of chemical energy stored inside, unless they are specifically referring to using it as a heating source. For electricity generated by coal it’s always measured as output.
DangitBobby 4 hours ago [-]
Why? I didn't start using more energy elsewhere when I switched to an EV or electric lawn maintenance tools. You think companies and people are using exactly as much power as available (or they can afford)?
bruce511 9 minutes ago [-]
It kinda depends on where the energy is coming from.
I was brought up to "save energy ". Lights switched off when not in thevroom, that sort of thing.
Now I gave solar on the roof. There's an excess production capability, so now, during most days it doesn't matter if stuff is on or off. That especially applies to AC which I'll happily turn on on hot summer days. In effect I use more "because it's there to be used".
My EV is coming soon and given I can charge it on solar I plan to do a lot more day-trips-out over weekends etc.
So you're right, availability and affordability- but electrifying is great (for me) for both those things.
silentkat 3 hours ago [-]
It's a well-known "paradox" known as Jevons Paradox. Given enough efficient use of a resource, overall usage could actually far outpace the efficiency gains. E.g. use of coal got efficient enough that travel via trains using it became possible, which led to way more usage of coal.
paulryanrogers 1 hours ago [-]
How far does it scale? Because I imagine there must be diminishing returns at some point. And even so, having a lot more renewable energy also means less cancer.
Lerc 60 minutes ago [-]
World energy production is increasing with solar coming to the forefront.
It is something overlooked by various reports of "In X amount of time, Y is projected to consume Z% of electricity" that the average increase in world electricity production is about 3% per year.
mullingitover 3 hours ago [-]
It doesn't say it would cut energy costs in half.
Meanwhile, fossil fuels are only 'cheap' because the users are pushing the negative externalities off on everyone else in the world. Priced properly they'd be even more costly than they already are.
https://www.youtube.com/watch?v=KtQ9nt2ZeGM
If 1kg of coal represents 1000 Wh, your generator loses 1/2 to waste heat, you only generate 500 Wh of usable electricity. Some analyses will state that renewable power has to replace the 1000 Wh of embedded energy within the coal, when it only needs to output 500 Wh.
If you use solar panels and generate 500 Wh directly, you have cut your energy use in half, even though the output has remained the same. An EV has a battery of ~80 kWh, equal to 2-3 gallons of gas, yet it can go a few hundred miles, a 3-4x ratio of efficiency, compared to an ICE.
I’ve never seen anyone measure coal power by the amount of chemical energy stored inside, unless they are specifically referring to using it as a heating source. For electricity generated by coal it’s always measured as output.
I was brought up to "save energy ". Lights switched off when not in thevroom, that sort of thing.
Now I gave solar on the roof. There's an excess production capability, so now, during most days it doesn't matter if stuff is on or off. That especially applies to AC which I'll happily turn on on hot summer days. In effect I use more "because it's there to be used".
My EV is coming soon and given I can charge it on solar I plan to do a lot more day-trips-out over weekends etc.
So you're right, availability and affordability- but electrifying is great (for me) for both those things.
It is something overlooked by various reports of "In X amount of time, Y is projected to consume Z% of electricity" that the average increase in world electricity production is about 3% per year.
Meanwhile, fossil fuels are only 'cheap' because the users are pushing the negative externalities off on everyone else in the world. Priced properly they'd be even more costly than they already are.
https://www.youtube.com/watch?v=-jSqcwxpd14