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A bit of context: In Spain, one of the European countries with better sunlight for solar production, some laws were passed recently that make it basically impos
by franciscop 10y ago
A bit of context: In Spain, one of the European countries with better sunlight for solar production, some laws were passed recently that make it basically impossible for individuals to resell excess energy to the grid, so selling/buying from the grid on demand instead of using batteries is not really an option.
That's why when we see countries like Germany (not so much sun) going strong for solar Spanish people complain and try to change a corrupt government that passes laws that strongly favors utility companies. Not to say that some of this government relatives work in these utilities.
- frgewut 10y agoWouldn't it be possible to create micro grids? E.g. tenants of one house or small town. They could sell electricity to each other then.
- hyperpallium 10y agoThe problem is demand will vary the same for all those in the same locality with time of day. Now, if you could somehow form a grid with people on the opposite side of the globe... BTW I like the idea of hydrobatteries: hydroelectric power stations sometimes pump water back up into the resevoir. One could do this with local water towers; perhaps even dual-purpose existing rain tanks, per house. Maybe not large enough; haven't done the math.
- MrsPeaches 10y agoHere you go: E = mgh 1000l tank = 1000kg 7m high roof (~2 stories) E = 1000kg * 9.81ms^-2 * 7m =~ 70 000j 1Wh = 3600j So a 1000l tank on your two story high roof would be able to store ~19Wh Not including mechanical losses For comparison a single decent sized SLA battery will be able to store 1000 Wh
- hyperpallium 10y agoThanks! Not as good aa I'd hoped...
- LeifCarrotson 10y agoThe numbers work better with increasing size, because volume is the cube of the dimensions. Also, you can build a pond on a hill with some excavators much more efficiently per unit volume than an enclosed plastic container. A 1m cube weighs 1,000kg and has about 20Wh. A 10m cube weighs 1,000,000 kg and has about 20,000 Wh. A 50m deep, 1 km square reservoir has 1,000,000 Wh. And that's still assuming that it's 7m above the turbine!
- franciscop 10y ago> Y se añade "en ningún caso un generador se podrá conectar a la red interior de varios consumidores". Esta medida habría beneficiado a las comunidades de vecinos. And it adds "under no circumstance a generator will be connected to the inner network of several consumers." This rule would have helped neighborhood communities.
- wolfhumble 10y agoSeems like you are quoting an article from El Páis and not directly the law itself. http://economia.elpais.com/economia/2015/10/09/actualidad/1444388935_118022.html http://economia.elpais.com/economia/2015/10/09/actualidad/14...
- narag 10y agohttps://www.boe.es/boe/dias/2015/10/10/pdfs/BOE-A-2015-10927.pdf https://www.boe.es/boe/dias/2015/10/10/pdfs/BOE-A-2015-10927... 5.2.B - En el caso de que existan varias instalaciones de producción, el titular de todas y cada una de ellas deberá ser la misma persona física o jurídica. (In case there are several production facilities, the owner of all of them must be the same natural or legal person)
- wolfhumble 10y ago"Y se añade "en ningún caso un generador se podrá conectar a la red interior de varios consumidores". Esta medida habría beneficiado a las comunidades de vecinos." Baterías y trabas burocráticas (right column): http://economia.elpais.com/economia/2015/10/09/actualidad/1444388935_118022.html http://economia.elpais.com/economia/2015/10/09/actualidad/14...
- narag 10y agoI'm not arguing it's not quoted from the article, just providing a source to the original in case someone is interested.
- narag 10y agoWouldn't it be possible to create micro grids? Expressly forbidden. This law is a custom suit for electric companies.
- deleted 10y ago[deleted]
- dharma1 10y agocan you elaborate on this? You mean the feed-in tariffs for individuals were cut in Spain? Is it different for companies who build solar farms?
- franciscop 10y agoSure, just a quick search. Worth noting that not following this law has a higher penalty than having a nuclear leak in a nuclear plant: > The new law also prohibits PV systems up to 100 kW from selling electricity. Instead, their owners are required to donate the extra electricity to the grid for free. http://www.renewableenergyworld.com/articles/2015/10/spain-approves-sun-tax-discriminates-against-solar-pv.html http://www.renewableenergyworld.com/articles/2015/10/spain-a... http://cleantechnica.com/2016/01/15/solar-policy-spain-still-might-changed/ http://cleantechnica.com/2016/01/15/solar-policy-spain-still...