Enter your billing period, usage, and region. We'll run three models against real wholesale price data — from basic load shifting through to full battery arbitrage — and show you what each approach would have cost.
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Warden watches prices every 5 minutes and acts the moment it's cheap.Wholesale cost only — does not include lines charges, retailer margin, metering, or GST. Unmanaged: load weighted by residential demand shape (morning and evening peaks) at average wholesale price. Smart scheduling: 65% of daily load shifted to the cheapest 3-hour window each day (any time — EV charging, heat pump hot water, spa pool, dishwasher, dryer); 35% at average price. Warden tells you exactly when that window is. Battery: daily arbitrage — charge during cheapest window, discharge during most expensive, 90% round-trip efficiency, net cost floored at zero. One charge/discharge cycle per day modelled; active management with Warden can identify multiple daily opportunities. NZ data at 30-minute resolution (historical) and 5-minute resolution (from May 2026). AU data at 5-minute resolution (from May 2025). NZ source: EA Wholesale Information & Trading System (WITS) — emi.ea.govt.nz. AU source: AEMO National Electricity Market — aemo.com.au.