NorthWestern Energy Data Access Guide
NorthWestern Energy is an investor-owned electric and natural gas utility serving roughly 850,000 customers across Montana, South Dakota, and Nebraska. Customers access billing and usage data through the My Energy Account portal and Detailed Energy Usage tool, while large C&I accounts can establish EDI feeds through the Key Account program. The utility is mid-rollout of two-way AMI smart meters across Montana.
How to Get Your NorthWestern Energy Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| My Energy Account Portal | ✓ | ✓ | All | Billing, usage | Monthly | HTML, PDF, CSV |
| Detailed Energy Usage Tool | ✓ | — | All (AMI areas) | Interval usage | Next-day where AMI deployed | CSV, PDF |
| Key Account EDI | ✓ | ✓ | C&I over 1 MW | Billing, invoice, usage | Event-driven | ANSI X12 |
| Green Button DMD/CMD | — | — | None | N/A | N/A | Not offered |
| Nectar API (third-party access) | — | ✓ | Varies | Billing, usage | Varies | Nectar API |
Billing Data Access
NorthWestern Energy provides billing data through the My Energy Account self-service portal, which offers 24/7 access to statements, usage by billing period, and year-over-year comparisons across all service territories.
What Data Is on Your NorthWestern Energy Bill
- Current and historical billing statements (PDF)
- Usage by billing period (kWh / ccf)
- Year-over-year usage comparisons
- Average daily temperature overlays
- Charges, taxes, and rate components
How to Download NorthWestern Energy Bills (Business & Commercial)
- 01Register a business account using business name and EIN
- 02Log in to My Energy Account
- 03Navigate to Billing then View Detailed Usage
- 04Configure granularity and date range, then download CSV
- 05For accounts over 1 MW, contact a Key Account Manager for EDI feeds
How to Download NorthWestern Energy Bills (Residential)
- 01Register for My Energy Account at https://myaccount.northwesternenergy.com/Register with service address, account number, and ID
- 02Verify email and create login credentials
- 03Log in and view current and historical statements
- 04Download individual bills as PDF or export usage from the Detailed Energy Usage tool
Third-Party Access to NorthWestern Energy Billing Data
Portal credential sharing
- 01Customer provides My Energy Account login to an authorized facility manager or consultant
- 02Third party accesses all data available in the online portal
- 03Note: not encrypted/scoped sharing, but a common practice
Property Manager portal (Continuous Service Agreement)
- 01Sign up at the Continuous Service Agreement portal with CSA customer number
- 02Add managed properties to portfolio
- 03View up to 24 months of usage history per address and download reports
Want to understand the charges on your bill?
See the NorthWestern Energy Rate Schedules & Tariff Guide →Interval Data & Smart Meters
NorthWestern is transitioning from one-way AMR to two-way AMI smart meters in Montana (roughly a three-year rollout that began in 2023). Where smart meters are deployed, the Detailed Energy Usage tool provides hourly, daily, weekly, and monthly interval data for both electric and gas.
How to Download NorthWestern Energy Interval Data via Green Button
How to Download NorthWestern Energy Interval Data via Portal
- 01Log in to My Energy Account
- 02Navigate to Billing then View Detailed Usage
- 03Select granularity (Hour/Day/Week/Month) and a date range
- 04Optionally enable temperature overlay
- 05Click the blue Download button to export CSV/Excel
Interval data is essential for rate comparison and TOU analysis.
See which NorthWestern Energy rate schedule is best for your usage pattern →Third-Party API Access
NorthWestern Energy does not publish a public developer API or a formal Share My Data program. An internal REST API supports portal operations (CSV/JSONL/XML/JSON), but it is undocumented for external use. Third-party programmatic access is achieved through Key Account EDI feeds or through Nectar, which provides API access to billing and interval data — see docs.nectarclimate.com.
Available NorthWestern Energy API Endpoints
| Function | Endpoint | Method | Format |
|---|---|---|---|
| Session authentication (internal, undocumented) | https://northwesternenergy.com/RestApi/session/is-authenticated/ | GET | JSON |
How to Register as a NorthWestern Energy API Vendor
- 01Confirm the customer is Key Account eligible (over 1 MW in Montana)
- 02Obtain signed customer authorization
- 03Contact a Key Account Manager to establish EDI trading-partner status
- 04Configure VAN or direct SFTP connection and test transmission
EDI (Electronic Data Interchange)
NorthWestern Energy offers EDI services to large C&I customers through its Key Account Management program. Eligibility in Montana is for industrial/commercial customers over 1 MW demand; in South Dakota/Nebraska it is the top 25 customers by usage and revenue. EDI enables automated electronic exchange of billing, invoice, and usage data.
Supported NorthWestern Energy EDI Transaction Sets
| Code | Name | Purpose |
|---|---|---|
| 810 | Invoice | Bill transmission in standard format |
| 814 | Metering Point / Usage Data | Interval/meter usage data exchange |
| 820 | Payment Order / Remittance Advice | Electronic payment submission |
| 867 | Product/Service Period Invoice | Detailed billing information |
How to Enroll in NorthWestern Energy EDI
- 01Confirm eligibility (over 1 MW in Montana, or top-25 in SD/NE)
- 02Contact the appropriate regional Key Account Manager (888-467-2669 MT; 800-245-6977 SD/NE)
- 03Provide account numbers, billing contact, and technical EDI contact
- 04Specify needed transaction sets (820, 814, 867, 810) and frequency
- 05Coordinate VAN or direct connection setup and run test transmissions
- 06Confirm successful test and move to production
Sources
Rate Schedules & Tariff Analysis
NorthWestern Energy's commercial and industrial rates are demand-driven: bills combine a fixed monthly service charge, a per-kWh energy charge (with the supply component flowing through the PCCAM), and a per-kW demand charge that often dominates the total for larger sites. NorthWestern's electric rates are among the higher tier in the region, and the November 2025 rate case order increased base rates effective February 1, 2026. Exact GSEDS cents-per-kWh and per-kW demand figures are published in the Montana tariff book.
NorthWestern Energy Rate Schedule List
| Schedule | Applicability |
|---|---|
| GSEDS-1 | Small to mid-size commercial general service. |
| GSEDS-2 | Larger demand-metered commercial service. |
| Large Industrial (over 1 MW) | Industrial customers eligible for Key Account services. |
| ISEDS-1 Irrigation | Agricultural irrigation pumping. |
NorthWestern Energy Rate Features & TOU Details
- Demand charges drive large C&I bills
- Electric supply recovered annually via PCCAM
- Base rates increased effective Feb 1, 2026 following the 2024/25 rate case
- Regulated single-provider market (no supplier shopping)
- Among the higher electric rates in the region
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full NorthWestern Energy Rate Optimization Guide →Other Data Access Programs
Property Manager Continuous Service Agreement
Allows landlords and property managers to monitor usage across multiple rental properties with up to 24 months of history.
- 01Sign up with a CSA customer number
- 02Add managed properties
- 03View and download per-address usage
Real Estate Agent Portal
Lets real estate professionals view historical usage and energy costs for properties they are buying, selling, or evaluating (with owner authorization).
- 01Register with license and brokerage info
- 02Request property access with owner authorization
- 03View and download property energy reports
Community Action Agency Portal
Supports authorized agencies providing bill assistance to low-income customers.
- 01Register as an agency with credentials and EIN
- 02Obtain customer authorization
- 03Access authorized accounts to coordinate assistance
Smart Meter Opt-Out
Customers may opt out of AMI smart meter installation at no charge, retaining their previous meter type (limits data to monthly).
- 01Contact 888-467-2669 or NorthWesternEnergyMeters@northwestern.com
- 02Confirm opt-out preference
Limitations & Considerations
- ⚠No Green Button Download My Data or Connect My Data implementation, limiting standardized third-party integration.
- ⚠Smart meter (AMI) rollout is incomplete as of 2026; many customers remain on legacy AMR meters with monthly data only.
- ⚠No documented public developer API; internal REST infrastructure is not available for external integration.
- ⚠Customers who opt out of smart meters are limited to monthly billing data.
- ⚠No formal data aggregator program; third-party access generally requires manual authorization and EDI setup.
- ⚠15-minute interval data is not yet standard and depends on full AMI deployment.
NorthWestern Energy Data Access FAQ
How can a commercial customer download interval usage data from NorthWestern Energy?▾
Log in to My Energy Account, go to Billing then View Detailed Usage, select Hour/Day/Week/Month granularity and a date range, then click the blue Download button to export CSV/Excel. Hourly data is available where AMI smart meters are deployed; legacy AMR meters provide monthly data only.
Does NorthWestern Energy support Green Button or a public API for C&I data?▾
No. NorthWestern does not offer Green Button Download My Data or Connect My Data and has no documented public developer API. Large C&I customers instead use the Key Account EDI program (ANSI X12) for automated billing and usage feeds, or may access data through Nectar's API — see docs.nectarclimate.com.
How does a third party (consultant or aggregator) get authorized access to a customer's data?▾
For accounts over 1 MW, the customer provides written authorization and the third party contacts a Key Account Manager to establish EDI trading-partner status via VAN or direct SFTP. For smaller accounts, customers may share portal login credentials or designate the third party through a property-manager portal.
Can commercial and industrial customers in Montana choose a competitive electricity supplier?▾
No. Montana is a regulated, vertically integrated market for standard C&I customers. NorthWestern Energy provides bundled generation and delivery with rates set by the Montana PSC; there is no competitive retail supplier shopping for typical commercial accounts.
What drives commercial and industrial electricity costs at NorthWestern Energy?▾
C&I bills under the GSEDS demand-metered schedules combine a fixed monthly service charge, a per-kWh energy charge (with supply recovered via the PCCAM), and a per-kW demand charge. The demand charge often dominates larger bills, so peak demand reduction and load-factor improvement are the highest-leverage cost levers.
The Best Way to Access Data from NorthWestern Energy
Nectar connects to NorthWestern Energy and 7,000+ utility providers — billing, interval, and rate data delivered automatically. No portals, no forms, no manual downloads.
Nectar for Energy & Sustainability Teams
Managing utility data for commercial or industrial buildings? Nectar offers a free energy data audit — we'll review your current setup and show you where automation can save your team hours every month.
Get a Free AuditNectar for Developers & Consultants
Building energy tools or advising clients on utility data? Nectar works with technology partners and consultants who need reliable data infrastructure.
Partner with Us