[al_bundling]

> Is pumped hydro really 30% more inefficient than even that figure?

The article states 30% cheaper, not 30% more efficient.

> If it's $103/GWh, on the other hand, then we're talking about only ~10% overhead on costs.

The article states $103/kWh, not per GWh. To calculate overhead costs you would need to know life cycle costs which were not disclosed.