Comment by zizee

Thanks! No need to apologise, it's fun to run the numbers.

On top of maintenance costs we probably need to account for finance costs (5% interest rate means repayments of 100mil over 10 years) and the fact batteries don't tend to ever get charged/discharged 100%.

Presumably if you built this you'd want a bit of return on your investment, so you'd have to charge more on top.

TBC: I think these batteries make economic sense (even more so if coal/petrol had externalities baked into their costs), but we don't want to oversell things