South Mountain Company

Recently active

Solar installer based in Massachusetts · installer record #11863 resolved from 499 public installation records.

Recorded installs

499

Total capacity

5.4 MW

DC nameplate

Median system

7.6 kW

≈ $40,600

Median price

$4.98/W

pre-incentive

Third-party owned

lease / PPA

Battery attach

First recorded

2007

Last recorded

2023

Track record

Install volume by year

2007

6$14.24/W

2008

6$11.34/W

2009

6$11.96/W

2010

15$8.82/W

2011

25$6.50/W

2012

19$7.00/W

2013

42$5.55/W

2014

28$5.70/W

2015

48$5.75/W

2016

45$5.44/W

2017

48$4.64/W

2018

43$4.79/W

2019

34$4.36/W

2020

35$4.15/W

2021

32$4.47/W

2022

41$4.61/W

2023

26$4.83/W

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

Latest records

Most recent recorded installs

Date	Location	Size	Price	Ownership
Oct 25, 2023	Edgartown, MA	19.1 kW	$93,500	Host-owned
Sep 27, 2023	Oak Bluffs, MA	11.7 kW	$53,390	Host-owned
Sep 20, 2023	West Tisbury, MA	10.4 kW	$50,400	Host-owned
Aug 23, 2023	West Tisbury, MA	7.2 kW	$35,400	Host-owned
Aug 23, 2023	West Tisbury, MA	15.8 kW	$62,900	Host-owned
Aug 3, 2023	Edgartown, MA	13.6 kW	$65,700	Host-owned
Jul 19, 2023	West Tisbury, MA	14.4 kW	$66,400	Host-owned
Jul 19, 2023	West Tisbury, MA	7.8 kW	$44,000	Host-owned
Jun 21, 2023	West Tisbury, MA	8 kW	$40,200	Host-owned
Jun 16, 2023	Tisbury, MA	5.7 kW	$26,700	Host-owned

Service geography

Massachusetts: 499

Busiest cities

West Tisbury, MA 122Edgartown, MA 111Chilmark, MA 109Tisbury, MA 69Oak Bluffs, MA 65Aquinnah, MA 22Sandwich, MA 1

Record

Installer ID: PC-11863
First recorded install: Jul 19, 2007
Last recorded install: Oct 25, 2023
Priced records: 498

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Frequently asked questions

How many solar installations has South Mountain Company completed?

The Tracking the Sun dataset records 499 installations by South Mountain Company, from Jul 19, 2007 to Oct 25, 2023, totalling 5.4 MW of capacity. Dataset coverage varies by state, so actual totals may be higher.

What does South Mountain Company charge for solar?

The median installed price across 498 priced systems is $4.98/W pre-incentive (median system 7.6 kW, ≈ $40,600). Third-party-owned (lease/PPA) share: 0%.

Where does South Mountain Company install solar?

Recorded installs span 1 state, led by Massachusetts (499).

Dataset updated July 2026 . Source: LBNL Tracking the Sun public dataset; installer resolved by exact-normalized name matching.