The later ones don't go through as much testing as the company's are trying to get them on the market quicker hence have more silly breakdowns eg broken blades etc. Needing larger cranes for access. Batterys are a good thing for there demand response and should be a small part of any grid system. Nuclear is expensive but by the time you add in storage, syn cons , transmission, 3 times overbuild for the capacity factor, 2 maybe 3 rebuilds for the lifetime limits, is it really more expensive especially if you build multiple units? We don't know because the current government lied about the price of nuclear and won't or can't tell us the total price of 90% intermittents grid. A lot of this infrastructure is going to be underutilised (batterys, transmission etc) Underutilised equipment is expensive, ask any business. If you still need it , you charge a lot for it. Basic economics. Hydrogen is supposed to be a big part of the plan but plants in Australia are falling over all the time. But we will just keep pouring tax payers money into it. Windfarms in the north UK are getting paid when they are curtailed because the grid can't handle the power. Wander when that will happen here. Windy in Europe at the moment, France only exporting about 10GWs at the moment at 17grams CO2/kWh. https://app.electricitymaps.com/zone/FR/72h/hourly