Solar installer

South Mountain Company

Installed solar on 27 homes since 2023 in Massachusetts. Installing since 2007. Latest install on record: January 2024.

Homes since 2023: 27
Median price: $4.79/W
Typical system: 10.4 kW
Leased or PPA: 0%

Price

Homes that bought their system from South Mountain Company paid a median $4.79/W installed, and the middle half paid $4.56/W–$4.97/W (23 systems since 2023, before incentives). That's $0.94 a watt above the Massachusetts median of $3.85/W.

7% of its recent systems included a battery.

Where it installs

Counties with homes it installed since 2023, busiest first.

Dukes County, MA · 27

By state

State	Homes	Median
Massachusetts	27	$4.79/W

Homes installed since 2023.

Installed prices and installers from public installation records: Lawrence Berkeley National Laboratory’s Tracking the Sun (systems installed through 2025) and state program files from California, New York, New Jersey, Connecticut, Illinois and Oregon, which run into 2026. Prices are in dollars per watt of panel capacity (DC), before rebates and tax credits, for homes that bought their system; leased systems and systems with batteries are left out.