Simon Göss breaks down the totals and additions for electricity generation in China. In 2019 the total reached 7,325 TWh (more than twice Europe’s) after adding 330 TWh (more than half Germany’s total). Of that 330 TWh, 120 TWh came from thermal (90%+ coal). But the numbers were dominated by renewables (hydro, wind, solar) which added almost 160 TWh. Though that’s the third year of declining renewables additions, wind and solar curtailment is … [Read more...]
Multi-energy “island” Microgrids can increase grid resilience
As the number of different technologies producing power and providing storage increases, the grid is getting complicated. The best way to make it resilient against outages is therefore changing. The traditional way is to shut down the failing plant, leaving the rest of the grid to cope as best as it can with the change in voltage and frequency. Xi Zhang at the Energy Futures Lab, Imperial College, describes the research looking at multi-energy … [Read more...]
Overbuild solar: it’s getting so cheap curtailment won’t matter
Avoiding curtailment made sense when solar generation was extremely expensive: don’t build solar beyond what you can store. However, that means solar must always wait for storage costs to decline and capacity grow. But with solar prices plummeting it can make economic sense to overbuild it, say Richard Perez, University at Albany, and Karl Rabago, Pace University. Oversized solar will deliver more energy in low light and reduce the need for … [Read more...]
Solar intermittency: upbeat “annual” carbon reduction estimates miss the “hourly” reality
There is a maximum speed at which solar capacity can expand. You know you’ve passed it when insufficient storage means solar curtailment, or selling the daytime excess means curtailment of other clean energy generators. As solar grows, so too will this problem. Vincent Xia, at the Precourt Institute for Energy, Stanford University, reports on a new Stanford study which says emissions predictions are not taking this into account, thus … [Read more...]
Recent Comments