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Old 06.03.2021, 11:01
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Solar system overproduction of electricity transfer to the power grid

If solar system temporarily produces an overproduction of electricity that is transferred to the power grid, does household receive discount when electricity must be purchased from the grid (winter time)? How does it function in Switzerland?
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Old 06.03.2021, 11:40
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Re: Solar system overproduction of electricity transfer to the power grid

Yes, normally any surplus is fed into the energy network and they buy it from you, the price depends on your local energy supplier and is usually a fraction of the purchase price. But there are different contracts out there, some energy providers will install for you at a lower price on the basis that they won't pay you back for any surplus each day.
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Old 06.03.2021, 11:44
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Re: Solar system overproduction of electricity transfer to the power grid

My supplier EKZ pay half the input rate (peak and off peak) for excess productions, which is about every sunny day. Otherwise they charge for consumption as usual. You don‘t do it for the money!

The consumption and feedback can be read off our meter at any time.

You should be aware that the payments are taxable as income, though the whole PV system is deductible - once...
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Old 06.03.2021, 19:57
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Re: Solar system overproduction of electricity transfer to the power grid

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My supplier EKZ pay half the input rate (peak and off peak) for excess productions, which is about every sunny day. Otherwise they charge for consumption as usual. You don‘t do it for the money!

The consumption and feedback can be read off our meter at any time.

You should be aware that the payments are taxable as income, though the whole PV system is deductible - once...
I wonder if any supplier charges energy storing fee, meaning that my surpluses sent to grid, deduct "my consumption*0.8". Basically provider charges 20% for storing the electrical energy.
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Old 06.03.2021, 20:41
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Re: Solar system overproduction of electricity transfer to the power grid

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I wonder if any supplier charges energy storing fee, meaning that my surpluses sent to grid, deduct "my consumption*0.8". Basically provider charges 20% for storing the electrical energy.
I think you are confused: there is only one electricity supplier in Switzerland - the one that supplies your area, as a benevolent monopoly.

I think you are over thinking this - how would this surplus be stored? Batteries have yet to reach anything like economic reality for mains storage. (Perhaps using pumps to fill high level reservoirs.)

Your excess production joins the power in the system and reduces the generation requirement. They don‘t keep it warm for you and charge 20% for the service...
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Old 06.03.2021, 20:55
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Re: Solar system overproduction of electricity transfer to the power grid

My provider pays about the same for feed in as the energy cost for consumption.

However you pay more for consumption because there is a network fee in addition, which is ca. 35% of the total cost.

Which actually makes sense - I suspect the local company makes all their profit from the network fee, regardless of the source energy provider.
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Old 06.03.2021, 20:56
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Re: Solar system overproduction of electricity transfer to the power grid

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I wonder if any supplier charges energy storing fee, meaning that my surpluses sent to grid, deduct "my consumption*0.8". Basically provider charges 20% for storing the electrical energy.
You could pre-order a powerwall and do it yourself

https://www.tesla.com/de_ch/powerwall

sometime in the future.......
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Old 06.03.2021, 21:26
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Re: Solar system overproduction of electricity transfer to the power grid

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I think you are confused: there is only one electricity supplier in Switzerland - the one that supplies your area, as a benevolent monopoly.

I think you are over thinking this - how would this surplus be stored? Batteries have yet to reach anything like economic reality for mains storage. (Perhaps using pumps to fill high level reservoirs.)

Your excess production joins the power in the system and reduces the generation requirement. They don‘t keep it warm for you and charge 20% for the service...
Actually they do not change much of the energy generation at all however they store more of and should there be constant sur-plus of storage over given period of time - that would lead to lower overall energy generation.

And spot on - PV likley won't ever pay for itself ... so it's done for fun than anything else - atom/oil lobby is still doing well ..
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Old 06.03.2021, 21:39
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Re: Solar system overproduction of electricity transfer to the power grid

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I think you are confused: there is only one electricity supplier in Switzerland - the one that supplies your area, as a benevolent monopoly.

I think you are over thinking this - how would this surplus be stored? Batteries have yet to reach anything like economic reality for mains storage. (Perhaps using pumps to fill high level reservoirs.)

Your excess production joins the power in the system and reduces the generation requirement. They don‘t keep it warm for you and charge 20% for the service...
I meant the "storage of electrical energy" metaphorically speaking. Realistically the supplier doesn't store it for me but uses it immediately. During winter months when solar system is generating not enough energy, customer pays only 20% of regular price until overproduction from summer is compensated.
I understand that EKZ returns money (50% of normal kWh price) which is also taxable.
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Old 06.03.2021, 22:20
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Re: Solar system overproduction of electricity transfer to the power grid

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Actually they do not change much of the energy generation at all however they store more of and should there be constant sur-plus of storage over given period of time - that would lead to lower overall energy generation.

And spot on - PV likley won't ever pay for itself ... so it's done for fun than anything else - atom/oil lobby is still doing well ..
Not according to all the calculations I've seen - allowing for 20% government rebate on solar installations, and claiming against tax for another 25%, amortisation takes about 12 years and then it will be profitable.

Panels are guaranteed for 25 years, but should last longer.

The return on investment over those 25 years would be about 4% - not stellar, but pretty good considering the stability.

There's a reason why all these farmers put solar on all their barns, it makes money.
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Old 07.03.2021, 12:23
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Re: Solar system overproduction of electricity transfer to the power grid

I've looked at the numbers and it can pay for itself within 12-15 years if you shop around, have the right slope on your roof, live in a sunny place, get a decent price for selling energy back (it varies quite a bit among the suppliers here) and don't have any hiccups with the system and can claim off your tax. Above all you have to change consumption habits, to switch on the water heating at midday if it's bright outside, to put the washing machine on over lunchtime etc. So in short it's not a guaranteed investment but can work for some. I think it probably boosts the sale/rental price as well if you move so there's a gain there too.
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