Getting more out of wires already built is becoming a strategy of its own
Serguey Asael Shinder2 min readThe International Renewable Energy Agency's latest tracking report puts a number on the problem: to triple renewable capacity by 2030, grid investment must rise to nearly USD1 trillion a year, more than double 2025 levels. New transmission takes the better part of a decade to plan and build. Two items from New South Wales show what fills the gap in the meantime.
A battery as a substitute for new lines. The 850MW Waratah Super Battery, now in final commercial operation, sits inside a System Integrity Protection Scheme run by the transmission operator, Transgrid. The scheme watches 36 lines in real time and can call on the battery to inject power, while adjusting paired generators, if a disturbance occurs. That standby response lets existing lines to the Hunter, Sydney and Illawarra carry more power than they otherwise could, until the Hunter Transmission Project connects inland renewable zones.
The distribution network as a shared asset. Ausgrid's community battery trial asks owners of large roofs to install more solar than they need, stores the surplus in local batteries and releases it to about 32,000 nearby customers in the evening peak. A separate pilot builds a virtual power plant from batteries on social housing. Both use the low-voltage network that already exists as the delivery system, rather than waiting for new generation to be connected far away.
What connects them
Each treats the existing grid as capacity to be used more intensively, not as a fixed limit to be built around. A protection scheme raises the safe operating limit of a line; local storage shifts energy through the network at hours when it has room; a virtual power plant turns thousands of small assets into something a system operator can dispatch.
What it does not solve
None of these replaces new transmission. Protection schemes are explicitly stopgaps, and local batteries move energy across hours, not across regions. IRENA's point stands: the wires still have to be built. But the time it takes to build them is exactly when these tools earn their keep, and the projects that deploy them fastest will connect more renewables before the new lines arrive.