nz_electricity_cost_calculator

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Estimate a New Zealand household's electricity cost, by region and appliance. Use for: 'how much does power cost in Auckland', 'what does my heat pump cost to run', 'why is my power bill so high', 'is electricity cheaper in Wellington', 'how much does it cost to charge an EV at home'. WHERE THEY LIVE CHANGES THE ANSWER MATERIALLY. Wellington pays 34.61c a unit and Balclutha 48.93c, from MBIE's survey. Ask for the town. LEAD WITH biggest_users. A heat pump and a hot water cylinder dominate almost every bill; standby power almost never does, which is the opposite of where most saving advice points. Naming the two appliances that matter is more useful than the total. MENTION THE FIXED CHARGE. Every connection pays a daily charge whatever it uses, so a low user pays a large share of the bill just for being connected, and a household under 8,000 kWh a year should compare a low fixed charge plan. Those regulations are capped at $1.80 a day from 1 April 2026 and are revoked on 1 April 2027. If they have their bill, pass custom_rate_cents and their own fixed charge rather than the regional average. If they know their own habits, pass appliance_hours: the defaults are a typical household, not theirs. Args: region: An MBIE survey town, or "nz average". household_size: 1 to 5, where 5 means five or more. daily_fixed_charge: In DOLLARS a day, from the bill. custom_rate_cents: Their own rate in cents per kWh including GST. appliance_hours: Override hours, keyed by heat_pump, hot_water, oven, clothes_dryer, ev_charger and the rest. Returns: Daily, monthly and annual cost with usage and fixed charge separated, every appliance costed, the three biggest users, and how the region compares with the national average and the extremes.