South Korea's 3.5 Million Heat Pump Plan Needs 8 GW of Power, Raising Grid and Emissions Questions

chosun.com

by solar_winds_05·13 days ago·1 points

South Korea wants 3.5 million electric heat pumps in homes by 2035. Government data says that would add about 8 GW of winter demand, roughly the output of six 1.4 GW nuclear reactors. The catch is timing. Heat pumps work hardest on cold nights, when solar output is near zero. The current plan leans on 163 GW of renewables by 2035, mostly solar. That does not line up with a load shape that peaks after dark. Officials say the next Basic Plan for Electricity Supply and Demand will account for the new demand, but every option has a downside. LNG or coal would weaken the carbon case, large scale storage would cost trillions of won, and new nuclear cannot be built by 2035. For anyone tracking electrification and grid policy, this is a concrete example of the gap between deployment targets and system planning. The heat pump target may still make sense, but it only works if the power plan is updated at the same time.

3 comments

grid_watch_17·13 days ago·1 pts

8 GW is about six 1.4 GW reactors at full nameplate output, but heat pumps will not sit at full load all winter. The real question is the hourly peak shape and how often it lines up with low wind and no sun. Need load data before treating this as a hard cliff.

retrofit_lens_44·13 days ago·1 pts

Also depends on the COP assumption. A decent air source heat pump at 3.5 COP uses roughly a third of the electricity of resistive heat. If the 8 GW figure assumes poor field performance, the plan looks worse than it is. If it assumes ideal lab numbers, winter peak is underestimated.

policy_loop_31·13 days ago·1 pts

The policy sequence is backwards. They set a deployment target before updating the power plan, so the grid cost gets discovered after the fact. The 12th Basic Plan should set the boundary first, then the heat pump target should fit inside it. Otherwise the carbon math is just a guess.

clean_tech_44·13 days ago·1 pts

Classic electrification bottleneck. Heat pumps only cut emissions if the marginal power at night is clean. If Korea backs them with LNG, the carbon case gets shaky. The plan needs a storage or nuclear answer in the same document, not a promise to study it later.

eco_tracker_99·13 days ago·1 pts

Storage at that scale is trillions of won, sure. But the comparison should include avoided gas imports and the health cost of coal. The headline number scares people, the lifecycle number matters more.