Updated: Jan 01, 2026
Location and Projects
Address
420 Sierra College Dr, Grass Valley, CA, 95945
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Sustainable Energy Group Inc Photos
Sustainable Energy Group Solar Contractor
• Solar electric systems for residential, commercial & agricultural applications.
From BuildZoom: Sustainable Energy Group Inc, 420 Sierra College Dr, Grass Valley, CA (Employees: David Henry Stokes, Ray Darby, and Raymond Killam Darby) holds a General Building, Electrical, Plumbing license and 1 other license according to the California license board.
Their BuildZoom score of 116 ranks in the top 2% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Sustainable Energy Group Inc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Sustainable Energy Group Inc Contact Information
Phone Number: (530) 902-3377
Address: 420 Sierra College Dr, Grass Valley, CA 95945
Sustainable Energy Group Inc Grass Valley
Quality
116
98th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Sustainable Energy Group Inc has a BuildZoom score of 116, which places them above 98% of 336,931 contractors in California.
Activity
|
5 projects
|
2025 |
|
5 projects
|
2024 |
|
12 projects
|
2023 |
Our building permit records indicate that Sustainable Energy Group Inc has worked on at least
22.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
11 projects
|
Home Additions |
|
19 projects
|
Solar installations |
Analyzing permits over the last 4 years shows that Sustainable Energy Group Inc mostly works on
solar installation
and home addition
projects.
Pricing
|
1 project
|
< $5k |
|
10 projects
|
$20k-$50k |
|
6 projects
|
$50k-$100k |
|
3 projects
|
$100k-$250k |
The typical size of their permits is approximately $42,182. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
Building Permits by Sustainable Energy Group Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Residential - with plan check - alteration or addition
2025-10-13
Roof mount solar size 13.02 kw install 31 mods - 420 w with 1 enphase combiner and 2 enphase batteries size 5kwh (total 10kwh) batteries are for arbitrage only (no backup) new 200a subpanel installed on backside of main panel (all loads moved to subpanel)
Valuation:
$60,347
Permit #:
25BLD-0583
Status:
applied
Fee:
$452
Permit Type:
N/A
Building Type:
N/A
Roof mount 67.650kwdc solar bible baptist church
Valuation:
$147,539
Permit #:
SOLR-25-0439
Status:
plancheck
Fee:
$1,306
Permit Type:
N/A
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2025-07-30
(n) (2) solaredge 7.6kw energy hub inverters (replacing existing inverters) and one[1] solaredge backup interface mid device (n) (4) solaredge batteries totaling 40kwh of storage (n) ev chargers: (2) solar edge smart ev charger (e) photovoltaic system consisting of 46 rec alpha + 46 solaredge optimizers. existing inverters to be removed & repaced (n) generator: 14kw kohler used only t... see more
Valuation:
$67,894
Permit #:
BLD24-07433
Status:
complete
Fee:
$670
Permit Type:
Alteration
Building Type:
N/A
Service panel at back of apartment complex damaged beyond repair. new location identified 200a (3ph) meter main service panel to be installed. conduit will be run from new msp to laundry buliding to resotre power to common area trench across parking lot 50
Valuation:
$34,823
Permit #:
24BLD-0004
Status:
final
Fee:
$259
Permit Type:
Electrical panel ...
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2022-12-02
31 - rec alpha black series 400-watt modules 1 - solaredge energy hub 10000h inverter 1 - balance of system (flashings/attachments rail conduit wire optimizers etc) 3 - solaredge 10kwh batteries 1-generator charger plug install location: roof current main amperage: 200 panel changeout: no proposed amperage: 200 inverter type/size: 1 solaredge energy hub 10000kw energy hub number of pa... see more
Valuation:
$98,853
Permit #:
BLD22-06069
Status:
complete
Fee:
$227
Permit Type:
Alteration
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2022-05-13
Install location: detached accessory structure (shop) roof mount current main amperage: 400a (located at (e) guest house) panel changeout: no photovoltaic output: 14.4 kw dc (30) photovoltaic modules: q.peak duo xl-g10.2 4980 (30) optimizers: solaredge p505 (1) inverter: solaredge se11400h-us (1) 100a generac smm (for future generator install to be permitted separately) (e) 200a subpa... see more
Valuation:
$70,981
Permit #:
BLD22-01311
Status:
expired
Fee:
$346
Permit Type:
Alteration
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2023-12-07
Install roof mount solar grid tied on single family dwelling (n) modules: (16) hanwha qcell qpeak duo blk ml-g10+ 400w (n) microinverters: (16) enphase iq8m-72-2-us (n) sub panel: 125a bus w (2) (e) 20a and (2) (n) 20a photovoltaic brkrs (n) air conditioning disconnect: 100a w 80a fuses (e) msp: 125a bus w 100a mcb and a line side tap for photovoltaic backfeed mounting system: ironrid... see more
Valuation:
$23,930
Permit #:
BLD23-07382
Status:
expired
Fee:
$235
Permit Type:
Alteration
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2022-04-14
Install 24 silfab sil360 nx modules install 1 solar edge 7600h-us inverter install 1 solar edge bat-10k1psob-01 10kwh battery install location: main dwelling current main amperage: e-225a msp panel changeout: no proposed amperage: 225a e-225a load center n-solaredge bacup interface e-125a subpanel inverter type/size: solar edge 7600h-us energy hub iverter number of panels/type: 24 mou... see more
Valuation:
$43,232
Permit #:
BLD22-00755
Status:
complete
Fee:
$345
Permit Type:
Alteration
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2022-04-01
R-3 **electronic submittal** vb install location: primary dwelling system output (kw): 7.77 kw dc current main amperage: 200a panel changeout: no (21) modules - rec alpha rec370aa (21) optimizers - se p400 (690.12 compliant) (01) inverter - se6000a-us (690.11 compliant) (e) 200a msp w 200a mcb (n) 40a photovoltaic brkr racking - ironridge trenching grading: no
Valuation:
$27,067
Permit #:
BLD22-01300
Status:
complete
Fee:
$211
Permit Type:
Alteration
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2022-06-23
Sent to shums coda for review supply and install (i) new generac 24k generator (generac-7209) quote# i 045222 - date i 31 2022 • supply and install (i) generac 200a automatic transfer switch and 20-circuit load center (generac- rxgw20sha3) • supply and install (i) new generac battery (generac-5819-525cc 12v 26r) current panel amperage: 200 proposed panel amperage: 200 change out new:... see more
Valuation:
$18,500
Permit #:
BLD22-02342
Status:
expired
Fee:
$241
Permit Type:
Alteration
Building Type:
N/A
Residential - with plan check - alteration or addition
2022-04-20
New solar roof installation on existing house with composition roofing. ironridge flashvue attachment and ironridge xr100 rail and hardware will support 19 qcell 400 solar panels making a 7600 watt solar system (or 7.6kw). the system will include 19 solaredge p400 optimizers and 1 solaredge 6000 hd-wave inverter 200a main panel change out
Valuation:
$22,343
Permit #:
22BLD-0101
Status:
final
Fee:
$474
Permit Type:
Solar
Building Type:
N/A
Residential: limited review - electrical mechanical plumbing roof solar etc
2021-08-12
Install location: roof mount current main amperage: 800amp panel changeout: no; using existing proposed amperage: (2)60amp and (1) 40amp inverter type/size: (2) solar edge/11.4k; (1) solar edge/7.6k number of panels/type: 113panel/rec365 mounting system: ironridge system output (kw): 38.696kw trenching grading: total of apprx 30ft
Valuation:
$141,674
Permit #:
BLD21-02947
Status:
complete
Fee:
$334
Permit Type:
Alteration
Building Type:
N/A
Residential: full review - additions adu accessory structures pools remodel demolish generators and
2021-05-14
Install location: ground mount north of residence (inverter at detached garage) main panel amperage: 200a panel changeout: no photovoltaic output: 17 kw dc (40) photovoltaic modules: hanwha q.peak duo l-g5.2 425 (40) optimizers: tigo ts4-a-f (3) dc disconnects (3) inverters: sol-ark-12k-p (1) 12kw generator: kohler 12res (1) 200a ats: kohler rdt (1) 200a backed up loads panel w 200a m... see more
Valuation:
$84,279
Permit #:
BLD20-05995
Status:
complete
Fee:
$710
Permit Type:
Accessory
Building Type:
N/A
Residential - with plan check - alteration or addition
2021-09-15
New solar roof installation on existing house with composition roofing. quickmount q-base attachment and ironridge xr100 rail and hardware will support 43 rec alpha 370 solar panels making a 15910 watt solar system (or 15.91kw). the system will include 43 solaredge p370 optimizers and 1 solaredge hd-wave 11400h inverter
Valuation:
$46,907
Permit #:
21BLD-0449
Status:
final
Fee:
$370
Permit Type:
Solar
Building Type:
N/A
New solar roof installation on existing house with composition roofing. quickmount q-base attachment and ironridge xr100 rail and hardware will support 25 solaria 36w solar panels making a 9000watt (9kw) solar system. the solar system will include 25 solaredge p370 optimizers and 1 solaredge 7600 hd wave inverter. the installation will also include 1 generac guardian 16kw generator wi... see more
Valuation:
$41,690
Permit #:
20BLD-0556
Status:
final
Fee:
$621
Permit Type:
Electrical - 2 in...
Building Type:
N/A
Residential: full review - additions adu accessory structures pools remodel demolish generators and
2023-11-28
Ground mount solar ground screw foundation 24 - qcell 480 watt modules 24 solar edge p505 optimizers 1 - solaredge hd-wave 10000h inverter 60 amp fused disconnect load side tap *generator on permit e012475
Valuation:
$54,760
Permit #:
BLD23-04167
Status:
complete
Fee:
$389
Permit Type:
Accessory
Building Type:
N/A
Residential - with plan check - alteration or addition
2021-02-19
New solar roof installation on existing house with composition shingle roofing. quickmount e-mount attachment and ironridge xr100 rail and hardware will support 12 silfab solar panels making a 3840watt (3.84kw) solar system. the system will include 12 solaredge p320 optimizers and 1 solaredge prism 7600watt inverter. this system will also include 1 lg chem resu 10kwh battery and 1 sol... see more
Valuation:
$24,051
Permit #:
21BLD-0059
Status:
final
Fee:
$369
Permit Type:
Solar
Building Type:
N/A
Residential - with plan check - alteration or addition
2021-03-03
New solar roof installation on existing house with composition roofing. quickmount e-mount attachment and ironridge xr100 rail and hardware will support 23 solaria 360 models making a 8 280watt (8.28kw). the system will include 23 solaredge p370 optimizers and 1 solaredge prism 7600h inverter. the system will also include 1 lg chem resu-10h battery with dedicated load center. will als... see more
Valuation:
$24,051
Permit #:
21BLD-0037
Status:
final
Fee:
$369
Permit Type:
Solar
Building Type:
N/A
Residential - with plan check - alteration or addition
2021-05-07
Solar installation - 39 solaria 400w modules xt 400r-pm making a 15 600 watt or 15.6kw system with a solaredge 11 400 watt inverter and a roof-mounted racking system of sci corrugated powermount attachments and ironridge racking system
Valuation:
$49,870
Permit #:
21BLD-0152
Status:
final
Fee:
$370
Permit Type:
Solar
Building Type:
N/A
Residential - with plan check - alteration or addition
2021-03-17
New solar roof installation on existing house with composition roofing. quickmount e-mount attachment and ironridge xr100 rail and hardware will support 20 rec alpha 360 black solar panels making a 7 200 watt solar system (or 7.2kw). the system will include 20 solaredge p370 optimizers and 1 solaredge 7600 hd-wave inverter
Valuation:
$21,600
Permit #:
21BLD-0149
Status:
final
Fee:
$369
Permit Type:
Solar
Building Type:
N/A
Sustainable Energy Group Inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
Sustainable Energy Group Inc License info
Verified License
| License # | 868816 |
| Status | Active |
| State | California |
| Type | General Building, Electrical, Plumbing |
| Business Type | Corporation |
- BuildZoom verified this license was active as of December 2025.
Verify this license's status for Sustainable Energy Group Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 868816 |
| Status | Inactive |
| City | Butte County |
| Type | Contractor |
| Business Type | Corporation |
- According to the Butte County, CA, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Sustainable Energy Group Inc at the Butte County, CA.
This is a sample of licensing data; click here to access a complete history.
116
BuildZoom Score
Bonded
| Bonded Agent | Wesco Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
321
Permits
- Building permit records show that Sustainable Energy Group Inc has worked on 321 permitted projects.
Sustainable Energy Group Inc Employees
DS
David Henry Stokes
Rmo
Ray Darby
President
RD
Raymond Killam Darby
Ceo / President