Solar Installation Timeline in Great Falls, MT

A detailed breakdown of how long each phase of solar installation takes in Great Falls, based on local permit processing times and NorthWestern Energy interconnection requirements.

2-3 weeks
Permit Timeline
$250
Permit Cost
6.8 kW
Recommended System
NorthWestern Energy
Utility Provider

Interactive Timeline

Select your roof type below to see how it affects your installation timeline. Tile and slate roofs require additional mounting work.

Installation Timeline for Great Falls, MT

9 weeks
Estimated total time (~2.1 months)
1

Site Survey & Design

1 week

Engineer visits your home, designs system layout, and finalizes panel placement.

2

Permitting

2-3 weeks

Your installer submits building permits and HOA applications to your local jurisdiction.

3

Installation

1 day

Crew mounts racking, installs panels, wires inverter, and connects to your electrical panel.

4

Inspection

1 week

City building inspector verifies the installation meets code and safety requirements.

5

Utility Interconnection

3 weeks

Your utility installs a net meter and grants Permission to Operate (PTO).

Other Cities in Montana

BillingsMissoulaBozemanHelenaButte

More Solar Resources for Great Falls

Great Falls Solar PermitsPermit costs and requirementsGreat Falls Installation ChecklistStep-by-step installation guideGreat Falls Solar SavingsCalculate how much you can saveGreat Falls Roof AssessmentIs your roof ready for solar?

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