How This Tool Works
📋 Purpose
Help households reduce phantom load energy spend with practical, savings-first prioritization.
⚙️ How It Works
- 1Set your electricity tariff or fetch a live rate
- 2Add appliances and standby assumptions
- 3Rank by annual waste and payback
- 4Apply top actions and re-evaluate quarterly
Tariff Settings
Using 24.5p/kWh — Ofgem Q1 2026 default
Total Annual Standby Waste
0p
0.0 kWh / yr from 0 appliances
No Appliances Yet
Start by adding your appliances to see which standby loads to tackle first for the best savings.
Prefills 8 common standby devices (TV, set-top box, console, router, microwave, laptop charger, printer, phone charger). You can edit or remove any.
Data Sources & Methodology
- Appliance standby wattages
- Daily standby hours
- Intervention costs & effort
- Postcode (if provided)
- Energy Saving Trust standby benchmarks
- Octopus Energy live regional tariffs
- Ofgem Q1 2026 price cap fallback
- BEIS 2024 grid emission factor
- Annual kWh = W × hrs × 365 ÷ 1000
- Annual cost = kWh × tariff
- Payback = cost ÷ annual saving × 365
- CO₂ = kWh × 0.207 kg/kWh
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Standby Load Prioritizer Guide
Estimate annual standby electricity waste by appliance and prioritize interventions by savings, payback, and disruption level.
📅 Last updated: 2026-07-01
Quick Tips
Jump-start your understanding with these essential tips
Add TVs, consoles, routers, chargers, and set-top boxes first since these often create persistent standby waste over the full year.
Enter your postcode in settings to pull your area's live Octopus Energy tariff so savings estimates match your actual bill.
If you are not on Octopus, set your real electricity price per kWh manually in settings for accurate annual savings and payback estimates.
Use the easy-wins filter to surface high-impact actions that require little behaviour change before tackling larger adjustments.
Step-by-Step Guide
Follow these steps to get the most from this tool
Enter your postcode to fetch a live regional tariff from Octopus Energy, or set your rate manually. The default is the Ofgem Q1 2026 price cap (24.5p/kWh).
💡 Pro Tips:
- •Check your latest bill for the exact unit rate.
- •Rates vary by region — a postcode lookup gives the most accurate figure.
Pick from 69 UK household presets or enter custom devices. Set realistic standby wattage, daily standby hours, intervention effort, and cost. Better input quality produces better savings ranking accuracy.
💡 Pro Tips:
- •Use manufacturer specs where available.
- •An energy monitor plug (£10–£15) can measure real standby draw.
Focus on appliances with the highest annual waste and short payback periods. The summary card compares your total against the UK average standby waste of £55–£80/yr (Energy Saving Trust).
💡 Pro Tips:
- •Prioritize devices with high annual savings and low effort.
- •A £10 smart plug for a set-top box can pay back in under 6 months.
Implement the top-ranked interventions first, then recheck after tariff changes, new device purchases, or seasonal usage shifts to keep savings current.
💡 Pro Tips:
- •Track completed actions to avoid double-counting.
- •Reassess after major appliance upgrades.
Advanced Topics
Deep dives for advanced users
Manual switch-off can fail in practice for frequently used devices. If adherence is low, an automated smart plug may deliver better realized savings despite upfront cost. The Standing Charge Impact Calculator can help separate fixed costs from the usage savings you control.
The 69 built-in presets use Energy Saving Trust benchmarks — useful starting points but not exact for every model. A plug-in energy monitor (£10–£15) measures actual standby wattage. Replace the preset value with your measured figure for accurate rankings.
Reducing standby waste is one piece of the puzzle. Use the Weather Aware Home Energy Planner to model heating and cooling savings alongside appliance phantom loads. If you are on a time-of-use tariff, standby draw during peak hours costs more — factor this into intervention priority.
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