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Australia's green energy glut signals an imminent test of Asia's grid limit

Industry officials claim that Australia's boom in renewable energy is wasting clean energy due to transmission bottlenecks, and the slow deployment of batteries. This signals challenges throughout Asia as the energy transition accelerates.

OpenElectricity data showed that wind and solar curtailments have more than tripled over the past nine months to 3.9 Terawatt-hours, or 6.8% of renewable production.

The amount of solar or wind power that was able to be produced, but was rejected preemptively because the grid reached its limit.

The Australian Energy Market Operator (AEMO) warned in July that some solar farms in Southeast Australia could be curtailed by 35% to 60% by 2027.

MIDDAY SOLAR FLOODS THE GRID

Kelvin Wong is the managing director of DBS Bank for energy, renewables, and infrastructure.

Wong stated that Australia's "duck curvature" - in which midday solar floods grids, causing negative pricing - signals emerging challenges in Vietnam, Japan, and the Philippines, as solar capacity exceeds demand during peak generation periods.

David Dixon, renewables analysts at Rystad energy, said that standalone utility solar is dead in Australia. The banks will no longer lend to standalone solar due to the curtailment risk.

According to the Clean Energy Council, a Melbourne-based industry association, the rolling 12-month quarter investment in renewable energy under construction in Australia dropped 28% at end-June to $1.1 billion due to a sluggish transmission rollout and delays in planning.

Clean Energy Council data showed that nine battery projects, with a cumulative capital expenditure exceeding $2.51 billion, received funding in the first six months of this year. This is a 23% increase annually.

Wong, DBS, said that to maximize the use of renewable energy, it is necessary to improve grid management, develop regional power trading, and scale up storage.

MANAGING CUTTING OFF

Miguel Fonseca is the CEO of EDP Renewables Asia Pacific. He said that his company performs extensive site surveys before investing capital. This includes evaluating the local grid dynamics as well as government transmission plans in order to determine locations where electricity can be supplied reliably with minimal curtailment.

Justin Oliver, deputy chairman at the Australian Energy Regulator said that solar curtailments were sometimes necessary due to an emergency or the slow pace of expansion in transmission. Australia has tripled the size of its transmission network and promoted home batteries to combat curtailment. He said this on the sidelines at the Singapore International Energy Week.

OpenElectricity's data shows that the power stored and discharged from batteries has more than doubled, reaching 1,01 TWh in the nine-month period ending September.

James Ha, the head of Asia-Pacific research at Aurora Energy Research, says that lenders and investors are increasingly interested in forecasting curtailments.

The issue of curtailment will not go away: it's just another risk that needs to be managed. (Reporting and editing by Emelia Sithole Matarise; reporting by Sudarshan Varadhan)

(source: Reuters)