The project – begun in 1974 and costing £425 million[6] So, constructing this storage facility costed basically as much as constructing an actual nuclear power

The project – begun in 1974 and costing £425 million[6] So, constructing this storage facility costed basically as much as constructing an actual nuclear power plant in 1970s of equivalent generating capacity. Thus, if instead of these, we simply build nuclear plants, we'll likely save money and won't have to deal with instability of generation.