5,970 solar installations registered with the Clean Energy Regulator · ranked top 10% in New South Wales · data current as at 2026-08-15
Based on last week's New South Wales grid mix (avg 790 gCO₂/kWh), Castle Hill's 5,970 solar systems typically avoid around 36.08 tonnes of CO₂ every hour during peak generation.
Grid intensity data: Open Electricity (openelectricity.org.au) · 7-day average · updates monthly
Castle Hill is one of New South Wales's strongest solar communities, ranking 42nd in the state — ahead of 94% of all New South Wales postcodes tracked by the Clean Energy Regulator. Growth has been strong, with 622 new systems installed in the past 12 months — a 57% increase on the previous year, making Castle Hill one of New South Wales's faster-growing solar postcodes.
The combined impact is substantial: Castle Hill's solar community avoids an estimated 57,634 tonnes of CO₂ every year — equivalent to taking 27,445 cars off the road or powering around 11,527 average Australian homes with clean electricity. This is estimated using New South Wales's average grid emissions intensity of 790 gCO₂/kWh, sourced from OpenElectricity, applied to an average system size of 9kW.