621 Energy

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Solar installer based in Massachusetts · installer record #100 resolved from 66 public installation records.

Recorded installs

Total capacity

3.6 MW

DC nameplate

Median system

24.8 kW

≈ $88,061

Median price

$3.36/W

pre-incentive

Third-party owned

14%

lease / PPA

Battery attach

First recorded

2012

Last recorded

2022

Track record

Install volume by year

2012

1$3.72/W

2013

3$3.40/W

2014

6$4.56/W

2015

4$3.60/W

2016

9$3.91/W

2017

10$3.57/W

2018

7$3.26/W

2019

10$2.90/W

2020

7$3.09/W

2021

4$3.85/W

2022

5$2.23/W

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

Latest records

Most recent recorded installs

Date	Location	Size	Price	Ownership
Nov 30, 2022	Amesbury, MA	85.9 kW	$186,775	Host-owned
Nov 4, 2022	Dracut, MA	63.4 kW	$141,074	Host-owned
Jul 18, 2022	Marion, MA	31 kW	$90,713	Host-owned
Apr 18, 2022	Holliston, MA	195.7 kW	$358,000	Host-owned
Mar 22, 2022	Cambridge, MA	32 kW	$83,560	Host-owned
Nov 4, 2021	Acton, MA	19.2 kW	$43,060	Host-owned
Feb 25, 2021	Lowell, MA	23.1 kW	$93,670	Host-owned
Feb 10, 2021	Boston, MA	15.1 kW	$55,040	Host-owned
Jan 12, 2021	Needham, MA	18.5 kW	$75,540	Host-owned
Dec 30, 2020	Melrose, MA	16.2 kW	$54,400	Host-owned

Service geography

Massachusetts: 66

Busiest cities

Boston, MA 5Acton, MA 5Needham, MA 4Melrose, MA 3Becket, MA 3Sharon, MA 3Cheshire, MA 2Newton, MA 2

Record

Installer ID: PC-100
First recorded install: Dec 26, 2012
Last recorded install: Nov 30, 2022
Priced records: 66

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Frequently asked questions

How many solar installations has 621 Energy completed?

The Tracking the Sun dataset records 66 installations by 621 Energy, from Dec 26, 2012 to Nov 30, 2022, totalling 3.6 MW of capacity. Dataset coverage varies by state, so actual totals may be higher.

What does 621 Energy charge for solar?

The median installed price across 66 priced systems is $3.36/W pre-incentive (median system 24.8 kW, ≈ $88,061). Third-party-owned (lease/PPA) share: 14%.

Where does 621 Energy install solar?

Recorded installs span 1 state, led by Massachusetts (66).

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