Electricity rates aren't always straightforward. Utilities and retail providers use different pricing structures that can significantly affect your bill. Understanding tiered, flat, and time-of-use rates helps you choose the right plan and predict your costs.
Flat Rate Pricing
With a flat rate, you pay the same price per kWh regardless of how much you use or when you use it. If your rate is $0.11 per kWh and you consume 700 kWh, your energy charge is simply $77. This is the simplest structure and easiest to budget for.
Tiered Rate Pricing
Tiered (or block) pricing charges different rates for different levels of consumption. The first block—say 0–400 kWh—might cost $0.10 per kWh. The next block (401–800 kWh) could be $0.12, and usage above 800 kWh might be $0.14. Higher usage pushes you into more expensive tiers.
How Tiered Rates Work
Example: You use 500 kWh. The first 400 kWh cost 400 × $0.10 = $40. The next 100 kWh cost 100 × $0.12 = $12. Total energy charge: $52. Your effective rate is $0.104 per kWh, even though individual tiers are higher or lower.
- Advantage: Encourages conservation; low users pay less.
- Disadvantage: Heavy users pay significantly more; bills can spike in summer or winter.
"Tiered rates reward efficiency. If you're close to a tier boundary, cutting 50 kWh could save more than you'd expect."
Time-of-Use (TOU) Pricing
Time-of-use rates vary by the time of day. Peak hours (e.g., 4–9 PM on weekdays) cost more because demand is high. Off-peak hours (nights and weekends) cost less. Some plans include a super-off-peak period for overnight charging or laundry.
Comparing the Three Structures
Your ideal structure depends on your usage patterns. If you're home during the day and run AC during peak hours, TOU might be expensive. If you're out all day and use major appliances at night, TOU could save you money. Flat rates are safest when you're unsure.