Australia’s electricity grid is facing unprecedented pressure from the rapid uptake of rooftop solar and other consumer energy resources (CERs). To address this, the Australian Energy Market Commission (AEMC) last week unveiled a draft rule proposing a new 20-year planning framework for electricity distribution networks across the country. Published on April 23, 2026, this significant development aims to modernise how local grids are managed, improve visibility, reduce solar export curtailment, and ultimately lower costs for Australian households and businesses.
The proposal seeks to replace the current distribution annual planning report with a more comprehensive Distribution Network Development Plan, to be published every five years with a standardised 20-year planning horizon. This shift is a direct response to the challenges posed by Australia’s world-leading solar penetration, which has transformed consumers into active energy generators.
Why a 20-Year Plan is Critical for Australia’s Solar Future
The existing electricity networks were primarily designed for one-way power flow from large, centralised generators to consumers. However, with rooftop solar capacity projected to reach 42.5 GW by 2036 according to the Australian Energy Market Operator (AEMO), and accelerating adoption of battery storage and electric vehicles, these networks are struggling to cope.
“The Australian Energy Market Commission (AEMC) has released a draft rule to modernise distribution network planning in response to the rapid uptake of consumer energy resources (CERs). The draft rule proposes introducing a new long-term planning framework and data reporting requirements to improve grid visibility and reduce consumer costs.”
One of the most pressing issues is solar curtailment, where homeowners and businesses with rooftop solar are sometimes unable to export their surplus electricity back to the grid due to network constraints. This not only reduces the financial benefits for solar owners but also represents a wasted renewable energy opportunity. The AEMC’s draft rule aims to tackle this by establishing a principles-based framework for Distribution Network Service Providers (DNSPs) to report more consistent and granular data on the low-voltage network.
Improved data availability is expected to provide greater clarity for consumers and investors, allowing them to understand existing network constraints – such as the potential for rooftop solar exports to be curtailed – before making significant investment decisions. This transparency is crucial for optimising individual solar and battery installations and ensuring they contribute effectively to the broader grid. Homeowners considering new solar and battery systems should ensure their inverters are compatible with future grid demands. For more on this, see our guide: When to Replace Your Solar Inverter in Australia 2026: Costs, Benefits, and Battery Compatibility.
Potential for Bill Savings and Stronger Investment
Efficient planning and investment decisions are paramount, as network costs constitute close to half of a typical Australian electricity bill. The AEMC believes that a smarter, data-driven grid, enabled by this new planning framework, will support the transition to cleaner energy while maintaining reliability and affordability.
Related modelling released by the AEMC on April 22, 2026, on network pricing reform, suggests that such changes could deliver up to $6 billion in savings over the next 15 years, reducing bills for most households and small businesses across Australia. Some families could potentially save up to $740 annually on their electricity bills by 2040. This indicates a broader benefit for consumers as the grid evolves to better integrate distributed energy resources.
While the investment case for rooftop solar and batteries remains strong, the modelling projects a slight extension in payback periods under such reforms: from approximately 4.4 to 4.7 years for solar-only systems, and from 4.6 to 5.0 years for solar-plus-battery systems. These minor adjustments reflect a more dynamically managed grid that values flexible energy use and demand response, rather than just raw export capacity. Australians looking to maximise their self-consumption and savings can explore Best AI Energy Management Systems for Australian Homes with Solar & Batteries in 2026: Maximise Savings and Self-Consump.
Next Steps for the AEMC Proposal
The AEMC is currently inviting feedback from the public and industry stakeholders on this draft rule, with submissions open until June 4, 2026. A final determination is expected in mid-2026. The implementation of this framework could fundamentally reshape how local grids interact with rooftop solar and other CERs, moving towards a more integrated and efficient energy system. This is a critical step in ensuring Australia’s electricity infrastructure keeps pace with the rapid adoption of renewable energy technologies and continues to deliver benefits to consumers.
Changes to federal battery rebates are also occurring, with a new tiered system commencing on May 1, 2026. For details on how this might affect future battery installations, refer to our guide: Australia’s New Tiered Home Battery Rebates (Post-May 2026): Your State-by-State Eligibility Guide.