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Cost is certainly an issue. It's not viable to run a smelter using diesl fuel (for example). But even in countries such as Australia such things do happen from time to time for either practical reasons (tecnical issues temporarily shutting the smelter or a need to meet contracted deliveries) or political reasons. It's not profitable, but it happens and I'd guess that it's even more likely in China.
But for industries where electricity is a relatively small part of total costs it's not such an issue. Diesel isn't profitable to run a smelter, but it's certainly more profitable burning diesel than closing shops or a call centre.
Either way, the bottom line is that hydro in China (or anywhere else) is a primary energy source along with coal, oil, gas, nuclear, wind and biomass (solar, geothermal etc are also primary energy sources but their usage is too trivial to be relevant).
To the extent that production of hydro in China goes down due to drought, demand for some other energy source goes up. In practice, the workable alternatives are possibly coal (running existng plants harder) or oil (hatily built temporary power stations or portable generators). That's because those two fuels are transportable internationally, there is existing infrastructure and so on. Everything else has too many difficulties with needed infrastructure, lead times, getting enough of it where it's needed etc.
But for industries where electricity is a relatively small part of total costs it's not such an issue. Diesel isn't profitable to run a smelter, but it's certainly more profitable burning diesel than closing shops or a call centre.
Either way, the bottom line is that hydro in China (or anywhere else) is a primary energy source along with coal, oil, gas, nuclear, wind and biomass (solar, geothermal etc are also primary energy sources but their usage is too trivial to be relevant).
To the extent that production of hydro in China goes down due to drought, demand for some other energy source goes up. In practice, the workable alternatives are possibly coal (running existng plants harder) or oil (hatily built temporary power stations or portable generators). That's because those two fuels are transportable internationally, there is existing infrastructure and so on. Everything else has too many difficulties with needed infrastructure, lead times, getting enough of it where it's needed etc.