PanelCensus

Stem

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Solar installer based in California · installer record #12073 resolved from 520 public installation records.

At a glance

Stem is a solar installer with 520 recorded installations totalling 6.5 MW, dated 2013 to 2025. All of its records are in California, where it ranks 441st of 6,220 profiled installers by volume and 721st of 10,536 nationally.

Recorded installs
520
Total capacity
6.5 MW
DC nameplate
Median system
78 kW
≈ $756,232
Median price
$2.05/W
pre-incentive
Third-party owned
2%
lease / PPA
Battery attach
143%
First recorded
2013
Last recorded
2025

Track record

Install volume by year

2013
2
2014
18
2015
167
2016
58$1.26/W
2017
195$6.10/W
2018
159
2019
194
2020
46$2.05/W
2021
1
2022
5
2025
1

Bars: recorded installs · right column: this installer's median $/W that year.

Latest records

Most recent recorded installs

DateLocationSizePriceOwnership
Aug 13, 2025Dinuba, CA——Host-owned · battery
Feb 3, 2022Torrance, CA——— · battery
Feb 3, 2022Torrance, CA——— · battery
Feb 3, 2022Torrance, CA——— · battery
Jan 28, 2022CA72 kW——
Jan 28, 2022San Diego, CA——— · battery
Sep 30, 2021Esparto, CA——Host-owned · battery
Dec 14, 2020Tustin, CA——— · battery
Dec 13, 2020CA250 kW——
Dec 13, 2020Chula Vista, CA——— · battery

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Service geography

California
846

Busiest cities

Santa Monica, CA 61San Diego, CA 52Irvine, CA 25Santa Ana, CA 22San Francisco, CA 19Beverly Hills, CA 19Culver City, CA 17

Record

Installer ID
PC-12073
First recorded install
Mar 5, 2013
Last recorded install
Aug 13, 2025
Priced records
3

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How does Stem compare with other installers in California?

By recorded installations Stem ranks 441st among the 6,220 installers based in California with five or more records. Its median system, 78 kW, is about 13 times the state median of 5.9 kW. 2% of its recorded installations are third-party owned (lease or power-purchase agreement), against 29% across California. 143% include battery storage, compared with 16% of California records. Installers of similar recorded volume in California include Cm Solar Electric (523), Solarworx (523) and Horizon Energy Systems (521).

How has Stem's installation volume changed?

Stem's earliest dated installation on record is from 2013. It has recorded installations in 11 calendar years. The busiest year was 2017, with 195 installations. 2025, its latest year with records, has 1. Its median price per watt moved from $1.26/W in 2016 to $2.05/W in 2020. The most recent recorded installation is dated Aug 13, 2025.

Where does Stem install solar?

All recorded installations are in California. The cities with the most of its installations are Santa Monica, CA (61), San Diego, CA (52), Irvine, CA (25), Santa Ana, CA (22) and San Francisco, CA (19).

Frequently asked questions

How many solar installations has Stem completed?

PanelCensus records 520 installations by Stem, from Mar 5, 2013 to Aug 13, 2025, totalling 6.5 MW of capacity. Public reporting varies by state, so the company's true total may be higher.

What does Stem charge for solar?

The median installed price across 3 priced systems is $2.05/W before incentives (median system 78 kW, about $756,232). The California median is $4.26/W.

Where does Stem install solar?

All 520 recorded installations are in California, the most of them in Santa Monica.

Is Stem still installing solar?

The most recent installation attributed to Stem in the public records is dated Aug 13, 2025; 2025 has 1 recorded installation. Records reach PanelCensus months to a couple of years after installation, so recent activity may not appear yet.

Does Stem install leased or PPA solar systems?

11 recorded installations by Stem (2%) are third-party owned — a lease or power-purchase agreement; across California the share is 29%.

Does Stem install battery storage?

744 recorded installations by Stem (143%) include a battery.

Related installers and places

Dataset updated . Sources: LBNL Tracking the Sun + permit and program records; installer resolved by exact-normalized name matching.

About this data

Source: Lawrence Berkeley National Laboratory's Tracking the Sun, merged with city permit records, state incentive programs and the USGS U.S. Large-Scale Solar Photovoltaic Database / EIA-860 plant registers, as published September 21, 2026 — PanelCensus refreshes it as each source publishes new records. See the methodology for how records are matched, cleaned and scored.

Cite as: PanelCensus, “Stem, solar installer (California)”, https://panelcensus.com/installers/california/stem-12073 (data as of September 21, 2026).