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China's hydro generators wait for the rains to come: Kemp

China's hydro generation has been essentially flat for the last three years, in spite of commissioning several big brand-new power plants, as a prolonged drought has greatly decreased river flows in the southwestern part of the nation.

Since the dry spell began in the middle of 2022, China has been forced to turn back to coal to meet electrical energy consumption, while wind and solar have actually helped fulfill some of the growth in demand.

Set up hydro capacity had actually climbed up 18% to 422 million kilowatts (kW) by the end of 2023 from 358 million kW at the end of 2019, according to the National Bureau of Statistics (NBS).

However the amount of hydro electricity produced fell 1% to 1,141 billion kilowatt-hours (kWh) in 2023 from 1,153 billion kWh fours years previously ( Output of energy products, NBS, March 2024).

Based on the previous trend, dry spell cut generation by about 190 billion kWh (-14%) in 2023 compared with what it may have been under typical river conditions based on capacity additions.

SOUTHWEST CHINA

Most of the nation's hydro generation comes from a string of enormous waterfall dams and power stations situated on the Yangtze and its tributaries, which drain pipes the Tibetan plateau and other parts of the southwest.

The neighbouring provinces of Sichuan and Yunnan alone accounted for 48% of the nation's total hydroelectric generation in 2020.

If the downstream province of Hubei, home to the huge Three Gorges Dam, is included, the generation share reaches 60%.

Other southwestern locations drained pipes by the Yangtze and smaller sized rivers, including Guizhou, Guangxi, Guangdong and Chongqing, take the share to 75%.

Chartbook: China dry spell and hydro generation

Southwest China gets the majority of its annual precipitation in between June and August throughout the East Asian Monsoon, with a. smaller amount between March and May during the spring rains,. while fall and winter season are very dry.

Because the middle of 2022, however, much of the region has. been grasped by a dry spell that has actually dramatically lowered river flows.

In most of Tibet and parts of Sichuan and Yunnan, rainfall. has actually been 50% or more second-rate considering that the middle of 2022.

The city of Yibin, situated on the border between Sichuan and. Yunnan, received simply 663 millimetres (26 inches) of rain in. 2023 and 1,024 millimetres in 2022 compared to an average of. 1,225 millimetres annually in between 2014 and 2021.

LOWER RIVER FLOWS

China gathers substantial information on rainfall, river circulations and. the volume of water seized behind the nation's hydroelectric. and watering dams.

Numerous nationwide and provincial government firms are. included, however the information is notoriously tough to gain access to in. real time, or perhaps at all ( Making China's water data. available, usable and sharable, Lin et al, 2023).

However, some indication of the drought's early effect can. be determined from the China Statistical Yearbook published by the. NBS.

Nationwide surface area water resources were examined as 2.60. trillion cubic metres in 2022, the most recent year for which data is. presently available.

Surface resources were 7% listed below the 10-year average for. 2012-2021 and the most affordable for any year because the serious drought. of 2011. The existing drought has most likely cut surface area resources. even further in 2023.

Additionally, the surface water data is for the nation as a. whole, and the deficit in southwest China is likely. far more serious.

Tibet's surface area resources had actually fallen by 10% in 2022 compared. with the flood-hit year of 2020, while Sichuan's were down 32%.

TURNING TO COAL

China's electricity consumption has actually risen after the country. raised social distancing controls and emerged from the exit wave. of the COVID-19 pandemic in early 2023.

Wind generation increased by 122 billion kWh (+18%) while. solar generation increased by 65 billion kWh (+28%) in 2023.

However with hydro output down 61 billion kWh (-5%), the nation. increased thermal generation by 379 billion kWh (+6%) to satisfy. growing demand.

Most of the extra thermal generation was from coal-fired. systems, though small quantities likewise originated from gas-fired power. plants, specifically in Guangdong and the southern province of. Hainan.

Lots of coal-fired generators act as reliability reserve units. to satisfy day-to-day and seasonal demand peaks along with back up in. case of variations in river flows and hydro generation.

The dry spell most likely cut hydro generation by around 190. billion kWh in 2023, however this is also an indication of just how much. additional hydro could be created when river streams go back to. normal.

It also gives a concept of just how much mainly coal-fired thermal. generation could be avoided when the dry spell ends and rainfall. returns to more normal levels.

WAITING FOR RAIN

Southwest China is coming to the end of the dry season and. waiting on the arrival of the spring rains and the primary summer. monsoon. River levels stay low.

As a result, thermal generation was up 104 billion kWh. ( +11%) in the first two months of 2024 compared to the exact same. duration in 2023. On the other hand, hydro generation was up by simply 2. billion kWh (+2%).

If the drought continues for a third consecutive summer,. hydro generation will remain depressed and the nation will have. no option however to increase coal firing again this year.

If the dry spell ends, nevertheless, the combination of a rise in. hydro generation with the rapid release of wind and solar. capacity will produce a sharp slowdown in coal-fired growth and. possibly even a small decline in 2024.

Related columns:

- China's renewables rollout indicates future peak in coal. ( January 19, 2024)

- China braces for record winter season electricity need. ( November 24, 2023)

- China's rains remains in the incorrect place for hydropower. ( August 22, 2023)

- Besieged by dry spell, China turned to coal to keep lights on. ( July 21, 2023)

John Kemp is a market expert. The views expressed. are his own. Follow his commentary on X https://twitter.com/JKempEnergy.

(source: Reuters)