Understanding California's Tiered Electricity Rates

California's tiered electricity rates are designed to encourage conservation by charging more as you use more. California consistently ranks among the states with the highest electricity rates in the country. While the concept is straightforward, the details can be confusing. This guide explains how tiered rates work and how to minimize their impact on your bill.

How Tiered Rates Work

Under a tiered rate structure, the price you pay per kilowatt-hour (kWh) increases as your usage increases. Think of it like income tax brackets—the first portion of your usage is charged at a lower rate, with higher rates applying to additional usage.

California's Tier Structure

Most California utilities use a two-tier system based on your "baseline allocation"—the amount of electricity deemed necessary for basic needs.

Tier 1: Usage up to 100% of baseline

Lower rate (approximately 25-30¢/kWh for SCE/PG&E)
Covers basic household needs

Tier 2: Usage above 100% of baseline

Higher rate (approximately 35-45¢/kWh for SCE/PG&E)
Applies to all usage beyond baseline

Baseline Allocations

Your baseline allocation depends on:

Climate zone: Hotter areas get higher baselines
Season: Summer baselines are typically higher than winter
Heating source: All-electric homes get higher baselines

Example Baseline Allocations (SCE):

| Climate Zone | Summer Daily | Winter Daily |

|--------------|--------------|--------------|

| Coastal | 11.0 kWh | 10.5 kWh |

| Inland | 16.5 kWh | 12.0 kWh |

| Desert | 22.0 kWh | 13.0 kWh |

The Math Behind Your Bill

Let's walk through a real example for an SCE customer in an inland climate zone during summer:

Assumptions:

Monthly usage: 900 kWh
Baseline allocation: 495 kWh (16.5 kWh × 30 days)
Tier 1 rate: $0.28/kWh
Tier 2 rate: $0.42/kWh

Calculation:

Tier 1: 495 kWh × $0.28 = $138.60
Tier 2: 405 kWh × $0.42 = $170.10
Total energy charges: $308.70

If all 900 kWh were charged at Tier 1, the cost would be $252—a difference of $56.70.

Why California Uses Tiered Rates

Conservation Incentive

Tiered rates encourage customers to reduce usage. The more you conserve, the more of your usage stays in the cheaper tier.

Equity Considerations

Lower-income households typically use less electricity. Tiered rates help keep basic electricity affordable while charging more for higher usage.

Grid Stability

By discouraging excessive usage, tiered rates help reduce peak demand and strain on the electrical grid.

Strategies to Stay in Lower Tiers

Know Your Baseline

Understanding your baseline allocation is the first step. You can find it on your utility bill or by contacting your utility.

Track Your Usage

Monitor your daily usage to see how you're tracking against your baseline:

SCE: My Account portal shows daily usage
PG&E: Energy usage details available online
SDG&E: Usage tracking through My Account

Focus on Big Users

Target the appliances that use the most electricity:

Air Conditioning: Often the biggest user in California summers

Set thermostat to 78°F or higher
Use fans to feel cooler at higher temperatures
Pre-cool before peak rate hours

Pool Pumps: Can use 2,000+ kWh per month

Reduce run time during mild weather
Consider a variable-speed pump
Run during off-peak hours if on TOU rates

Electric Water Heaters: Consistent daily usage

Lower temperature to 120°F
Insulate the tank and pipes
Consider a heat pump water heater

Time Your Usage

While tiered rates don't vary by time of day, reducing overall usage keeps you in lower tiers:

Run full loads of laundry and dishes
Air dry clothes when possible
Use natural light during the day

Tiered vs. Time-of-Use Rates

California utilities also offer time-of-use (TOU) rates, which charge different prices based on when you use electricity rather than how much.

When Tiered Rates Are Better

You can't shift usage to off-peak hours
Your usage is relatively low and consistent
You're home during typical peak hours (4-9 PM)

When TOU Rates Are Better

You can shift usage to off-peak hours
You have an electric vehicle you charge overnight
You have solar panels (TOU often pairs better with solar)
You're away during peak hours

Special Considerations by Utility

Southern California Edison (SCE)

Baseline varies significantly by climate zone
Medical baseline available for qualifying customers
TOU rates becoming the default for new customers

Pacific Gas & Electric (PG&E)

Similar tier structure to SCE
CARE program provides 30-35% discount for qualifying customers
Medical baseline increases allocation by 500 kWh/month

San Diego Gas & Electric (SDG&E)

Highest rates in California
Strong incentive to stay in Tier 1
TOU rates may offer better savings for many customers

Programs That Can Help

CARE (California Alternate Rates for Energy)

Low-income customers receive a 30-35% discount on electricity. This effectively lowers both Tier 1 and Tier 2 rates.

FERA (Family Electric Rate Assistance)

Households slightly above CARE income limits receive an 18% discount.

Medical Baseline

Customers with qualifying medical conditions receive additional baseline allocation, keeping more usage in Tier 1.

The Future of Tiered Rates

California is gradually transitioning toward time-of-use rates as the default for residential customers. However, tiered rate options will likely remain available for customers who prefer them.

Understanding your current rate structure—and the alternatives—helps you make informed decisions about your electricity usage and rate plan selection.