Chongqing has carried out hourly green power trading for the first time. Green power trading covers electricity generated from renewables such as wind and solar under separate contracts, and has generally been settled monthly or annually.

What distinguishes this round is the trading unit: one hour, enabling what is called time-matching between generation and consumption.

Why hourly matters

Solar generates by day; wind fluctuates irregularly by season and hour. Under annual contracts only totals need to align, so electricity used at night can be offset on paper by renewable output produced at midday.

Hourly matching removes that slack. Because it tests whether renewable power was actually generated in the same hour it was consumed, corporate renewable-use claims can be verified far more strictly.

Data centers and continuous manufacturing

The keenest interest comes from data centers running around the clock and from continuous-process manufacturers. Internationally, as the concept of 24/7 carbon-free energy spreads, more buyers are demanding hourly certificates.

The approach also raises the value of storage: banking surplus solar by day and discharging at night improves an hourly match.

What it means for exporters

As rules that account for embedded carbon — the European Union's carbon border mechanism among them — expand, the ability to document the hourly attributes of electricity is becoming part of export competitiveness. That applies to Korean and Chinese-heritage firms with production in China as well.

This paper treats the measure as a technical change in power market design. Its effectiveness can be assessed once actual trading volumes and verification systems are in place.