In the past, what you say may well have been true, but as the price of solar and wind has been dropping (and battery storage improving), this is changing quickly. Solar is now the cheapest option for new power generation in many parts of the world while wind is the cheapest in others. Nuclear is arguably now the most expensive option for power generation, particularly if one takes into account the long-term costs of decommisioning and waste storage. Our current high hydro rates are mainly attributable to the high cost of nuclear retrofits (as well as gas plant cancellations). If we need any base load power, it would be far cheaper to import hydro from Quebec.