SBD wrote: ↑
Fri Jun 26, 2020 3:51 pm
NEM rules were changed a few years ago to require new intermittent generation assets to have some kind of backup to ride out the bumps that weren't properly forecast. Hence the Government's gas turbines are being rehomed and run by renewable energy producers, so they will be allowed to connect more wind turbines and solar panels.
What?!! Source????? Bungala Solar Farm has no gas backup nor will the Cultana Solar Farm.
The fact these companies are able to run 24/7 is due to fossil fuel generation still providing 95% of power overnight.
What??!! Source....Opinion masquerading as fact....my guess is that between midnight and 6am wind provides 30-40% of power in SA.
There is already talk of disconnecting rooftop solar during times of high generation as it overloads the grid. Rooftop solar is now getting to the point where it can produce in excess of 100% in some areas at some times in some months-it is a big problem in WA where excess power cannot be dumped onto other states. Maybe when battery storage has advanced enough to provide longer periods of supply, this wont be such an issue. Or build a link to the Eastern states.
Yes you are right....but with caveats....the only two places where this is possible in Australia at the moment is South Australia and Western Australia (There is not enough solar generation capacity compared to demand in the other states) and only on very low demand Sundays in spring and autumn.
Why Sundays....because those two states can experience very low demand for electricity on Sunday (as can the the rest of the country)
Why spring and autumn....because if the temperature sits at a comfortable 22-25 degrees, then no one is using electricity to heat or cool their homes/offices etc. A small change in temperature either way and demand instantly increases.
https://reneweconomy.com.au/rooftop-sol ... lia-69609/
https://www.abc.net.au/news/2019-12-01/ ... d/11731452
There are some easy short term solutions to head off this potential problem.......and that's all it is at the moment.....a potential problem.
Encourage everyone with home solar to change the time of day they heat their water tanks. Despite the fact people have free electricity during the day a lot of Australians are still recharging the hot water system after midnight. Yes at 1202 am every day in Australia there is an electricity spike from hot water systems being heated. This a cultural leftover from the 1980's when electricity was charged with 2 tariff rates, peak and off-peak which started at midnight. Charging home hot water between 12-3 pm would soak up some solar generation and this would not be sent to the grid.
As more people are installing home solar panels so too will the number of home batteries increase. So large amounts of power will never make it into the grid, but instead be stored in people's batteries.
Hopefully home owners with solar/batteries will join a VPP so their electricity can be fed into the grid as required.
Also AEMO will require future home solar installations to have inverters that can be remotely turned off.
In South Australia large batteries (Tesla, North Dalyrymple, Lake Bonney) could be encouraged to recharge on these low demand Sundays. A weather forecast would give the authorities an indication of whether this might be necessary.
And AMEO are getting more comfortable allowing very large amounts of renewable energy to dominate the grid. In South Australia AMEO use to demand that 400 mw of gas generation be run at all times.....they have now relaxed that down to 200mw.......What if they relaxed further to 100 mw, thats a lot of home solar that could be accommodated in the near future.