What it models
- Your annual usage is distributed into 48 half-hour intervals using your selected usage pattern or uploaded profile.
- Retailer import rates are applied by time window and day tag rules (weekday/weekend/any-day handling).
- Solar generation uses a fixed typical daytime shape from your annual solar input.
- Battery dispatch follows physical constraints: capacity, charge/discharge limits, efficiency, SOC floor, and cycle limits.
- Each scenario is run with the same assumptions so differences reflect tariff and dispatch settings, not random noise.
Important caveats
- Results are not a bill guarantee. They are a planning estimate under average conditions.
- Plan availability and eligibility rules vary by address, meter setup, retailer criteria, and signup checks; a listed plan may not always be offered to every customer.
- Weather variability is simplified. Daily cloud, heatwaves, and seasonal anomalies can shift solar and load significantly.
- Household behavior is assumed stable. Real usage timing changes (EV charging, heating, occupancy) can alter outcomes.
- Tariffs and plan terms can change over time. Future price movements are not forecast.
- Network limits, retailer special clauses, controlled-load rules, and temporary promotions may not be fully captured.
- Battery aging/degradation and installer-specific control logic are not fully modeled as long-term performance curves.
How to use the numbers
Treat annual savings as an expected midpoint, not an exact endpoint. A practical approach is to read each result as a range around the estimate and prefer options that remain attractive even if conditions vary.
In short: this is best for ranking and screening options, then validating your top shortlist with your retailer and installer.
Power Plana is an independent comparison tool and is not affiliated with electricity retailers or networks.