title: "Electricity Rate Structures Explained" description: Fixed-rate, tiered, time-of-use, demand, and real-time pricing — how utilities charge for electricity and which plan saves you the most. summary: Fixed-rate, tiered, time-of-use, demand, and real-time pricing — how utilities charge for electricity and which plan saves you the most. category: grid difficulty: Intro updated: 2026-02-10 tags: ["rates", "utility", "TOU", "tiered", "pricing"] relatedTools: ["/tools/rate-plan-optimizer", "/tools/bill-decoder"] faqs:
- question: Which rate plan is best for solar owners? answer: It depends on your net metering policy and battery situation. In general, time-of-use (TOU) rates benefit solar owners who can export during expensive afternoon peaks and use battery storage or shift usage to off-peak. If your utility values solar exports at a reduced rate, a flatter rate structure may be better. Use a rate comparison calculator with your actual usage data.
- question: Can I switch rate plans with my utility? answer: Most utilities allow customers to change rate plans, though there may be restrictions (once per 12 months, must stay for minimum period, etc.). Contact your utility or check their website for available plans. In deregulated states, you can also switch supply providers.
- question: What is peak vs. off-peak? answer: Peak hours are when electricity demand (and price) is highest — typically 4 PM to 9 PM on weekdays in most U.S. utilities. Off-peak is when demand is lowest — overnight and weekend hours. Mid-peak (shoulder) hours fall in between. Exact hours vary by utility and season.
- question: Is TOU pricing mandatory? answer: In most states, TOU is optional — a rate you choose. California is the major exception, where most residential customers have been defaulted to TOU rates since 2019, though they can opt out to a tiered plan. Some states are moving toward TOU as the default to encourage load-shifting.
Electricity Rate Structures Explained
Your electricity rate structure determines how you're charged for each kilowatt-hour. Different structures create different incentives for when and how much electricity you use. Understanding your options can save hundreds or even thousands of dollars per year, especially for solar and EV owners.
Flat Rate (Uniform Pricing)
How it works: You pay the same price per kWh regardless of when you use electricity or how much you use.
Example: 16 cents per kWh for all usage, all hours, all months.
Best for: Households with consistent energy use throughout the day who don't want to think about timing.
Pros: Simple, predictable, no behavioral changes needed.
Cons: No savings opportunity from shifting usage; you pay the same rate during cheap overnight hours and expensive peak hours.
Tiered (Inclining Block) Rates
How it works: The price per kWh increases as your monthly usage crosses predefined thresholds.
Example: | Tier | Usage | Rate | |:-:|---|:-:| | 1 | First 500 kWh | $0.12/kWh | | 2 | 501–1,000 kWh | $0.18/kWh | | 3 | Over 1,000 kWh | $0.28/kWh |
Best for: Energy-efficient households that use less than the Tier 1 cap. Penalizes high consumption.
Pros: Rewards conservation; low-use households get a low rate.
Cons: Punishing for larger families, homes with electric heating/cooling, or EV owners. Adding uses like EV charging pushes usage into expensive tiers.
Time-of-Use (TOU) Rates
How it works: The price per kWh varies by time of day, day of week, and sometimes season.
Example: | Period | Hours | Rate | |--------|-------|:-:| | Off-peak | 12 AM–6 AM | $0.08/kWh | | Mid-peak | 6 AM–4 PM, 9 PM–12 AM | $0.14/kWh | | On-peak | 4 PM–9 PM weekdays | $0.35/kWh |
The price spread between peak and off-peak can be 3x to 5x — creating a strong incentive to shift usage.
Best for: Households that can shift heavy electricity use (EV charging, laundry, dishwashing, pool pumps) to off-peak hours. Excellent for solar+battery owners who can export during peak and draw stored energy at night.
Pros: Significant savings potential (10–30%) for flexible households.
Cons: Requires behavioral changes; penalizes usage during peak hours (when many people naturally cook and run appliances).
TOU + Solar Strategy
- Solar produces during midday — under TOU, midday may be mid-peak
- Battery charges from solar during the day
- Battery discharges during on-peak (4–9 PM) when rates are highest
- EV charges off-peak (overnight) at the cheapest rate
- Net metering exports (if available) during on-peak maximize credit value
Demand Charges
How it works: In addition to per-kWh charges, you pay for your peak power draw (measured in kW) during the billing period. Typically measured as the highest 15-minute average demand.
Example: If your peak demand is 8 kW and the demand charge is $10/kW, you pay $80/month in demand charges regardless of total energy consumed.
Where it applies: Historically for commercial customers, but increasingly appearing in residential rates, especially for solar customers and EV owners. Arizona Public Service (APS) and Salt River Project (SRP) in Arizona have residential demand rate options.
How to manage: Avoid running all heavy appliances simultaneously. Stagger EV charging, HVAC, and cooking. A smart load management system can limit peak demand automatically.
Real-Time Pricing (RTP)
How it works: Price per kWh changes hourly based on wholesale market conditions. You see tomorrow's prices today and adjust accordingly.
Where it applies: Limited residential availability. ComEd (Chicago) and Ameren (Illinois) offer residential RTP programs. More common for commercial/industrial customers.
Pros: Lowest average price for highly flexible consumers who can respond to price signals.
Cons: Price volatility — can spike to $1+/kWh during extreme weather events. Requires automation or constant attention.
Critical Peak Pricing (CPP)
How it works: Normal rates apply most of the time, but during declared "critical peak events" (typically 10–15 days per year), prices jump dramatically — sometimes to $0.50–$1.00+/kWh for a few hours.
Trade-off: Non-event rates are lower than standard rates, so you save money most of the time and pay a premium during the few critical peak events.
Best for: Households that can dramatically reduce usage on short notice during events. Battery owners can discharge to avoid critical peak consumption entirely.
Electric Vehicle-Specific Rates
Several utilities now offer EV-specific rate plans with deeply discounted overnight charging:
| Utility | EV Rate (Off-peak) | Standard Rate | |---------|:-:|:-:| | Pacific Gas & Electric (EV-B) | $0.26/kWh (12–3 PM) | $0.38–0.58/kWh | | Alabama Power (PEV) | $0.05/kWh (9 PM–5 AM) | $0.13/kWh | | Duke Energy (NC EV pilot) | $0.07/kWh (11 PM–6 AM) | $0.12/kWh | | Xcel Energy (MN) | $0.04/kWh (midnight–6 AM) | $0.14/kWh |
Check your utility's website for EV-specific rate options — they can reduce charging costs by 50–75%.
How to Choose
- Get your usage data — download 12 months of interval data (15-min or hourly) from your utility
- Model each available rate — apply each rate structure to your actual usage pattern
- Factor in planned changes — solar, battery, EV, heat pump additions change your optimal rate
- Use comparison tools — many utilities offer rate comparison calculators on their websites