China thinks big on power generation, delivery

The world's second-biggest economy, China, is setting its sights on a massive expansion of its electric power sector. The country is growing increasingly energy hungry as its already massive manufacturing sector expands — and the smog haze around populated areas grow indisputably denser.

Some power sector expansion scenarios laid out by Bloomberg New Energy Finance could address both power reliability and environmental concerns, however at least one scenario would require 88 GW in new power generation capacity every year from now until 2030.

That would mean a build-out equal to the entire generation capacity of the United Kingdom every single year. Still, if any country can accomplish this, it's probably China.

China, which by the way is already the world's largest single source of carbon dioxide emissions and the most powerful generator of electric power in the world, could add more than 1,500 GW of new power generation in the next two decades, according to Bloomberg's surveys.

In a scenario called "The New Normal," a reasonably progressive yet still conservative estimate of what China might do with its energy sector, this would require an investment just shy of $4 trillion.

At the same time, though, cuts in overall emissions could still be achieved as soon as 2027 through the adoption and integration of more renewable energy capacity and the phase-out of coal-fired power. Large hydropower would constitute more than half of new capacity. China is already home to the world's biggest and most powerful hydropower projects, and even more are being planned.

The New Normal plan also calls for an expansion of China's natural gas-fired fleet that would push down coal-fired generation from 67 percent of China's energy mix to 44 percent by 2030. Coal-fired power would still expand in this scenario by nearly 40 GW per year, it should be noted.

Separate from this planned massive power generation build-out, another way China is thinking big is its anticipated $100 billion investment in ultra high-voltage transmission lines (Read more about that here). The State Grid Corp. of China, which according to some estimates is the world's biggest utility, has either approved or is already building 20 such transmission projects.

These 20 high-voltage lines will form a massive network that will link up the densely populated and heavily industrialized southern and eastern parts of China with the west, where the country's hydropower potential is already better realized than just about anywhere else in the Eastern Hemisphere. China has already built the world's most massive and powerful dams in its eastern provinces, including Three Gorges, which at 22,500 MW generates as much electricity as 15 nuclear power plants.

Linking up the country's east and west with high-voltage power transmission is a smart way for China to make effective use of low- or no-carbon generation. Over the long term, this will help China's overall power portfolio become less polluting. Focusing on a well-built power grid with plenty of storm-hardening countermeasures and redundancies will prevent a scenario like we see in Brazil, which also uses massive dams to power far-flung population centers, but which suffers from regular outages when transmission lines are damaged or cut off.

As I write this, Brazilian authorities are working to restore power to eight states and tens of millions of people because a fire in northeast Brazil damaged transmission lines that link huge hydro assets from cities (See that story here). As China grows, it would do well to keep an eye on Brazil and remember what happens when you build out your cities and power plants, but neglect your transmission infrastructure.