Page 37 | Solar.com

Please enter a valid zip code.

How Much Is The Average Electric Bill in California?

By How Do Solar Panels Lower Your Electric Bill?, The Pros and Cons of Rooftop Solar in 2025 No Comments

The average electric bill in California is $170 per month, based on a statewide average monthly electric usage of 571 kilowatt-hours (kWh) per month and an average utility rate of 29.84 cents per kWh in August 2023.

Of course, California is a massive state and everyone’s mix of electricity usage and utility rate is unique. So, in this article, we’ll break down the average electric bill in California a little further to account for different housing types and utility rates. We’ll also use electricity rate forecasts from California’s three largest utilities (PG&E, SCE, and SDG&E) to get a sense of what an average electricity bill will look like in the near future.

Average electricity bill by dwelling type in California

The average California electricity bill of $170 per month mentioned above is based on statewide averages for electricity usage, which lumps together studio apartments in LA and Beverly Hills mega-mansions even though they use vastly different amounts of electricity.

In fact, our analysis of data from the Energy Information Administration (EIA) found that detached single-family homes in California use on average 801 kWh of electricity per month compared to 417 kWh per month for apartments. When we multiply those new usage figures by the average utility rate, we find that the average electricity bill in California ranges from $123 to $239 per month, depending on the type of home.

Average electric bill by dwelling type

Dwelling type Avg. monthly usage Avg. monthly bill
Detached-single-family home 801 kWh  $239
Apartment 417 kWh  $124
Mobile home 714 kWh  $213
All households 571 kWh  $170

 

average california electric bill by housing type august 2023

Larger bills for single-family homeowners make sense, given space heating and cooling make up a majority of electricity consumption, and they typically have more space to heat and cool. In fact, as the square footage of the dwelling increases, so does the average electricity bill.

Based on the average utility rate of 29.84 cents per kWh in August 2023, homes with 3,000 or more square feet in California have an average monthly bill of $321 per month — nearly double the $138 per month for homes with less than 1,000 square feet.

average California electric bill by square footage Aug 2023

So, based on square footage and dwelling type, the average electric bill for a 1 bedroom apartment in California is likely closer to $138 per month than it is to the statewide average of $170 for the same month.

It’s worth noting that square footage is not a perfect indicator of electricity consumption. For example, a 1,500 square foot home with all electric appliances and two electric vehicles charging in the garage would likely have greater consumption than a 2,500 square foot home with all gas appliances and cars.

 

 

How much does electricity cost in California?

The other variable to consider is the price you pay per kWh of electricity, also known as your utility rate. Just like consumption, this can vary quite a bit in a large state like California.

The EIA lists the average utility rate in California in August 2023 as 29.84 cents per kWh, but there are many rates across the state that make up this average. For example, customers of San Diego Gas & Electric (SDG&E) paid over 40 cents per kWh in the first quarter of 2023, according to a May 2023 Senate Bill report, while Los Angeles Department of Water and Power (LADWP) customers paid closer to 22 cents per kWh in the first quarter of 2023 (although it has increased substantially as of June 1, 2023).

With that in mind, the average electric bill in California depends both on the dwelling type and the utility provider issuing the bill. For example, apartment owners in SCE territory pay around $130 per month while single-family homeowners in SDG&E territory pay closer to $324 per month.

The chart below shows the average bill for detached single-family homes and apartments for California’s three largest utility providers, along with the state average utility rate.

chart showing average electric bill in california for single-family homes vs apartments

Even with relatively low electricity consumption, Californians face some of the highest electricity bills in the nation due to utility rates that are around double the national average. And, unfortunately, that trend is only expected to accelerate in the coming years.

In fact, forecasts in a May 2023 Senate Report showed residential utility rates increasing:

  • 10.4% annually for PG&E, reaching 42.2 cents per kWh by 2026
  • 6% annually for SCE, reaching 35.3 cents per kWh by 2026
  • 10.4% annually for SDG&E, reaching 56.2 cents per kWh by 2026

chart showing forecasted electric rate hikes for californias three investor owned utilities

If rates increase as forecasted above, the average electric bill for IOU customers using 801 kWh per month would reach $283-450 per month by 2026, as shown in the chart below.

chart showing forecasted average monthly electric bills in California from 2023-2026

Why is electricity so expensive in California?

California’s high electricity prices are in large part due to its outdated and inefficient central grid system, which has two major challenges: Generation and transmission.

California generates around 70% of its own electricity in-state and imports the other 30% from nearby states in the Northwest and Southwest. Importing this electricity is expensive, especially in late summer when electricity consumption is at its peak and hydroelectric sources are no longer at full capacity. So, to keep up with demand, California grid operators must build more in-state generation or continue importing from nearby states.

Both routes cost money, which is reflected in utility rates.

There’s also the issue of transmission. While new wind and solar generation is relatively cheap to build, it requires new transmission lines to connect it customers — which can be expensive to build in a massive state like California. Not only does California need new transmission infrastructure, it also needs to replace existing lines that are aging and being destroyed by wildfires and other extreme weather events.

Simply put, making California’s 150-year-old central grid system work for its 39 million residents is an expensive undertaking. And much of that cost is passed onto utility ratepayers in the form of electricity rate hikes.

Fortunately, California is also overflowing with sunshine and homeowners can reduce their essential electricity costs by producing their own solar electricity and creating a more resilient grid by storing it with home batteries.

Connect with an Energy Advisor to get binding solar and battery quotes from reputable local installers.

 

Should I Get an AC- or DC-Coupled Solar Battery?

By How Do Solar Batteries Work?, Solar Battery No Comments

With utility rates soaring and net metering policies eroding, home battery storage systems have become essential for homeowners to control their essential electricity costs. But picking a solar battery isn’t as easy as picking a AAA to power your TV remote.

One of the key decisions homeowners confront is whether to invest in AC- or DC-coupled solar batteries — which can impact the cost, efficiency, and overall complexity of their system.

In this article, we’ll explore the key differences between AC- and DC-coupled batteries and how to choose a battery type that best serves your energy goals.

What’s The Difference Between AC-Coupled vs. DC-Coupled Solar Batteries?

The main difference between AC- and DC-coupled batteries is the type of electrical current that flows into the battery. All solar batteries store DC electricity, but AC-coupled batteries are designed to receive alternating current (AC) while DC-coupled batteries are designed to receive direct current (DC).

On a practical level, DC-coupled batteries are more efficient because they can receive the DC electricity produced by solar panels. On the flip side, AC-coupled battery systems are less efficient because the direct current from the solar panels must be inverted twice — from DC to AC, then back to DC — before actually going into the battery for storage, and a little bit of energy is lost each time the current is inverted.

In both instances, the stored DC electricity must be inverted to AC as it exits the battery so it can be distributed throughout the home or local power grid.

Chart showing the differences in AC- and DC-coupled battery systems

So why even have AC-coupled battery systems if they are more complicated and less efficient? To better understand that, we need to take a look at your home energy ecosystem.

AC vs DC electricity in your home

As mentioned above, there are two types of electrical currents — AC and DC — that are used in different ways. AC is better suited for transporting electricity over distances and is therefore used by the electrical grid, the wiring inside your home, and certain household appliances like toasters, garage door motors, and washing machines. DC is better suited for energy storage and powering certain household devices like laptops, TVs, and microwaves.

Alternating Current (AC) is… Direct Current (DC) is…
Distributed throughout home Produced by PV solar panels
Distributed on the utility power grid Stored by battery storage
Used to power toasters, garage door motors, and washing machines Used to power TVs, microwaves, and device charging

So, in a typical solar system without battery storage:

  1. The solar panels produce a direct current
  2. A solar inverter changes it to an alternating current to distribute throughout the home or export onto the grid
  3. Certain appliances use AC current while others have dedicated inverters (like the black box on your laptop chord) to invert the current once again to DC

Many modern solar-only systems have microinverters attached to each solar panel, so the first inversion takes place before the electricity ever leaves the solar panel. In order to add batteries to these systems, the battery needs to be able to receive AC electricity and invert it back into storable DC electricity — hence AC-coupled batteries.

As you might have guessed, there are unique advantages and disadvantages to AC- and DC-coupled batteries.

Advantages and Disadvantages of AC-Coupled Solar Batteries

AC-coupled solar batteries seamlessly integrate with existing solar inverters, making them a popular choice for retrofitting solar systems. This compatibility with the grid and solar inverters simplifies installation and reduces initial costs.

On the flip side, these systems suffer from double conversion losses — once when DC from solar panels is converted to AC for home use, and again when storing excess AC as DC in the batteries. Due to energy losses during these inversions, the maximum round-trip efficiency for today’s AC-coupled batteries is 90%. So, if your solar system sends 10 kWh of electricity to your battery during the day, you’ll only draw 9 kWh from your battery at night.

So, while upfront costs are lower, the long-term value may be impacted by these efficiency losses and potentially higher maintenance costs.

Advantages and Disadvantages of DC-Coupled Solar Batteries

DC-coupled solar batteries shine in efficiency, with only a single inversion as the current exits the battery, boasting round-trip efficiency of up to 97.5%.

With fewer components, DC-coupled batteries can be easier and less expensive to configure into new solar systems. However, their integration can be complex in existing solar setups, potentially limiting their appeal to new installations or homeowners willing to overhaul their current system.

Examples of AC and DC Solar Batteries

Of our top 8 best solar batteries of 2023, five are AC-coupled and three are DC-coupled (including the Panasonic Evervolt which can be configured either way).

Our top AC-coupled batteries include:

Battery Round-trip efficiency
FranklinWH aPower 89%
LG ESS Home 8 90%
sonnen Core+ 86%
Enphase IQ 3T/10T/5P 89%
Tesla Powerwall 90%
Sunpower SunVault 86%
Panasonic Evervolt (AC configuration) 89%

Our top DC-coupled batteries include:

Battery Round-trip efficiency
LG RESU 10H/16H Prime 97.5%
Generac PWRcell DCB 96.5%
Panasonic Evervolt (DC configuration) 94%

Based on round-trip efficiency alone, DC-coupled batteries are the easy choice. However, there are more factors to consider when deciding which type of battery is best for your solar system.

 

 

Factors to Consider When Choosing Between AC and DC Solar Batteries

Selecting the appropriate solar battery coupling hinges on multiple factors, including the current solar setup, efficiency concerns, installation specifics, and compliance with legal standards.

Let’s start with the most obvious factor: Whether the battery is being configured into a new or existing solar system.

Existing Solar Infrastructure

As a rule of thumb, AC-coupled batteries are better suited for adding into existing solar systems while DC-coupled are better suited for installing at the same time as the solar panels. However, with enough time, money, and installation expertise, it is possible to configure a DC-coupled battery into an existing solar system.

As we covered above, many modern solar systems have microinverters attached to each panel that flip the current from DC to AC before it even leaves the panel. In order to configure a DC-coupled battery into such a system, you’d need to remove the microinverters from each panel — which requires additional labor and essentially wastes the microinverters.

The process can be a bit simpler in systems with a single “string inverter” that inverts electricity for all the panels. However, there is still a significant amount of labor and waste in such a re-configuration.

Efficiency and Battery Usage

Another key factor to consider when deciding between AC- and DC-coupled batteries is the system’s round-trip efficiency and how you are going to use your battery storage.

Let’s say you are deciding between an AC-coupled battery with 90% round-trip efficiency and a DC-coupled battery with 97.5% round-trip efficiency. If you only plan on using your battery for essential backup power when the grid goes down, that extra 7.5% efficiency may not be worth paying for — especially if you need to configure the DC-coupled battery into an existing solar system. However, if you plan on charging and discharging the battery every day in self-consumption mode to reduce your electricity bills, then that 7.5% difference in efficiency will certainly add up over time.

Efficiency becomes an even greater factor if you plan on powering large loads like air conditioning and home EV charging. If you have a three-battery system with 40 kWh of usable capacity, then a 90% efficient system would allow you to access 36 kWh while a 97.5% efficient system would give you access to 39 kWh.

Over time, 3 kWh per cycle adds up to significant energy and cost savings.

Installation Complexity and Costs

One of the most influential factors in large purchases like a home battery is the upfront cost. Battery prices vary based on a number of factors, but perhaps the most influential is the scope of work.

In general, it’s more cost-effective to install batteries at the same time as solar panels, because many of the soft costs (labor, permitting, inspection, etc) overlap. In that case, it’s also more cost-effective to buy a DC-coupled battery because it requires fewer inverters and simplifies the system configuration.

On the other hand, if you are adding a battery to an existing solar system, installing an AC-battery is typically more cost-effective because you are avoiding the addition labor of removing the solar inverters and re-configuring the system.

 

 

Regulatory Restrictions and Grid Connection

Navigating the complex landscape of energy regulation is crucial when selecting a solar battery system. Local and national electrical codes often dictate whether an AC- or DC-coupled system is permissible, with some jurisdictions having specific requirements for grid-connected solar installations. These regulations can influence the type of inverter you can use, the manner in which your solar battery integrates with the grid, and even the overall efficiency and cost-effectiveness of your setup.

For instance, certain areas may mandate anti-islanding protection, which is more straightforward to implement with AC-coupled systems. Conversely, regions with policies that favor self-consumption might align better with the efficiency of DC-coupled systems during daylight hours. It’s essential to consult with a knowledgeable local solar installer who is well-versed in the latest regulations to ensure compliance and optimize your system’s performance.

Is AC- or DC-Coupled Battery Better?

The best battery is that one that empowers you to achieve your energy goals. While DC-coupled batteries offer greater efficiency, AC-coupled batteries are easier to configure into existing solar systems. The best type of battery for your system also depends on how you plan on using your battery.

Connect with an Energy Advisor to design a custom system and compare battery prices from local installers.