[hef19898]

Gas can't compete, because gas is too expensive. Coal actually could compete, it usually was the second type of power plant able to sell on the electricity markets, becasue CO2 certificates are just dirt cheap, way to cheap to move the needle, and coal as fuel was the least expensive (sun and win being free).

[jacquesm]

Sun and wind aren't 'free' but they have the lowest operating costs compared to alternatives and they have the lowest capital cost per W of installed power. But you probably should account for a storage component as well once those hit deployment in volume. I'm holding out for the next generation of storage batteries and then I'll pull the trigger on a system large enough to do both arbitrage and cover the day/night cycle of this house for a week. That works out to 70 to 100 KWh of storage, which is right now both too expensive to make sense (we still have net metering here) and a safety concern. But I expect the next generation storage to both be substantially cheaper and safer than what's out there today.

[hef19898]

True, sun and wind aren't free. In terms of energy markets (too lazy to look up the up to dtae details, so it might have changed in the last 5 years), only the variable costs for producing one kWh of electricity are taking into account (so basically fuel plus CO2 certificates, over simplified a bit). In that sense, sun and wind are free. Don't ask me why fix costs aren't considered...

Grid stabilization is priced in, usually using specific contracts with producers and large consumers (read steel, chemical, paper industrial sites and other with huge electricity needs). In that regard, the European markets are working fine and as intended.

Long term, we have to solve the issue of electricity storage. Short term, we are totally fine with renewables producing <60% of our electricity, and on some days even more. Base load became much less of a problem, most hige consumers in the industrial sectors found ways to be much more flexible in their demand, driven in no small degree by being to make extra money on the spot markets (and we talk 10s of millions here).

[jacquesm]

Yes, consumer flexibility will be a huge part of the solution. You can already see this with power intensive industries operating when power is cheap (or even on surplus power) and reducing or even stopping their output when power is expensive. Obviously not all industries have this option, sometimes energy is only a small fraction of their expenses. But it is good to see at least this part of the market aspect of energy production and consumption operating as it should. Meanwhile I'm sitting pretty with 7.7 MWh net returned to the grid on my private installation.

[hef19898]

Lucky you, we lookes at PV when we built our house. But back then, well, we just didn't have the necessary 15k left for an installation. As soon as we get an EV, for now the required size for four people is just to expensive, there will be PV installed alongside a wall box. Our roof is large enough, albeit propably tricky (almost flat, but not completely, covered by bitumen). But we'll see!

[jacquesm]

Flat roof is very doable, I have 34 out of 50 panels here on less than 10 degree slope on a flat roof. What's nice about it is that even though it isn't optimal when the sun is out it works very well when the sky is overcast, sometimes even better than the panels that are oriented towards the sun.

[hef19898]

Good news! And since our house is pretty much running north-south, with an unobstructed view of the sun until around, say, mid-afternoon, the aide of our roof facing east should be quite suitable (to get more sun on it, we'd have to remove all the trees, moat of which are 30+ years old, something we don't want to do). One day, there will panels on that roof!

[Detrytus]

CO2 certificates are not "dirt cheap", for Polish coal-based power plants they amount to 59% of the cost of producing electricity.

[hef19898]

Still cheap enough to make coal one of the cheapest source on electricity markets, measured in generation cost per kWh. Since coal is the dirtiest fuel we have, those certificates should be expebsive enough to price out coal most of the time. That would be an ingenious combination of setting incenzives for market players im way that the result of market activities benefits everyone.