Green Mountain Power Data Access Guide
Green Mountain Power is Vermont's largest electric utility, serving roughly 275,000 customers statewide. It has deployed AMI smart meters across its territory and lets customers export hourly interval data as CSV through its Oracle-based My Account portal, though it has not published a formal Green Button or developer API.
How to Get Your Green Mountain Power Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| My Account portal - CSV usage export | ✓ | — | All (residential, C&I) | Hourly interval kWh | Daily (4 AM ET) | CSV |
| My Account portal - PDF bills | ✓ | — | All | Monthly billing | Monthly | |
| Unofficial Python API | ✓ | ✓ | All (with credentials) | Hourly usage + generation | Daily | JSON/objects |
| Green Button / ESPI API | — | — | None | Not implemented | N/A | N/A |
Billing Data Access
GMP provides billing access through its Oracle Utilities-based 'My Account' self-service portal. Authenticated customers can view and download monthly statements as PDF and export usage data as CSV. There is no formal third-party billing data program; consultants typically rely on customer-shared exports or call GMP support to arrange authorization.
What Data Is on Your Green Mountain Power Bill
- Monthly energy statements (PDF)
- Customer charge and per-kWh usage charges
- Demand charges (for demand-billed rates)
- Regulatory and cost adjustments
- Taxes and fees
- Payment history
- Hourly usage data (CSV export)
How to Download Green Mountain Power Bills (Business & Commercial)
- 01Create or log in to the My Account portal at https://greenmountainpower.com/account/.
- 02Use 'Manage User Settings' then 'Add/Manage Accounts' to consolidate multiple commercial premises under one login.
- 03Open 'Billing & Payment History' to download monthly statements (PDF) per account.
- 04Go to the Usage dashboard to export hourly interval data as CSV for analysis.
- 05For third-party access, call (888) 835-4672 to ask about authorization requirements.
How to Download Green Mountain Power Bills (Residential)
- 01Navigate to https://greenmountainpower.com/account/ and click 'Create Account'.
- 02Enter your GMP account number (found on your energy statement) and complete registration.
- 03Log in, scroll to 'Billing & Payment History', and click any bill to view the statement.
- 04View or save the bill as PDF through your browser.
Third-Party Access to Green Mountain Power Billing Data
Customer-shared CSV/PDF export
- 01Customer logs into My Account and exports usage CSV or downloads bill PDF.
- 02Customer emails the files to the consultant or aggregator.
- 03Third party ingests and analyzes the data manually.
Phone-arranged authorization
- 01Third party calls GMP at (888) 835-4672.
- 02Requests the third-party data authorization process and any required forms.
- 03Customer provides written consent; GMP delivers data per request.
Want to understand the charges on your bill?
See the Green Mountain Power Rate Schedules & Tariff Guide →Interval Data & Smart Meters
GMP has deployed AMI smart meters across its territory and presents hourly interval data through the My Account Usage dashboard. Customers can export their interval data as CSV via a quick 30-day download or an advanced custom-date-range export. Data is refreshed daily at 4:00 AM ET.
How to Download Green Mountain Power Interval Data via Green Button
- 01Log in to My Account at https://greenmountainpower.com/account/.
- 02From the main menu, click 'My Account' then 'Usage'.
- 03For the last 30 days, click the green 'Download Usage' button (CSV).
- 04For a custom range, click 'View advanced export options', set Start/End dates, choose CSV, and download.
- 05Open the CSV (timestamp + kWh columns) in Excel, Google Sheets, or a data tool.
Interval data is essential for rate comparison and TOU analysis.
See which Green Mountain Power rate schedule is best for your usage pattern →Third-Party API Access
GMP has not published an official developer portal, API documentation, API keys, or a sandbox. An open-source Python client reverse-engineers the undocumented API behind the Oracle portal, enabling programmatic retrieval of hourly usage and solar generation data using a customer's own credentials. It is unofficial and unsupported by GMP.
Available Green Mountain Power API Endpoints
| Function | Endpoint | Method | Format |
|---|---|---|---|
| Fetch hourly/daily/monthly usage (unofficial) | Internal Oracle portal API (undocumented) | GET | JSON / Python objects |
How to Register as a Green Mountain Power API Vendor
- 01Install the client: pip install greenmountainpower
- 02Initialize GreenMountainPowerApi with the customer's account number, username, and password.
- 03Call get_usage() with a precision (HOURLY/DAILY/MONTHLY) and start/end times.
- 04Iterate results for consumed_kwh and generation_kwh values.
- 05Note: unofficial and subject to breakage if GMP changes its portal backend.
EDI (Electronic Data Interchange)
How to Enroll in Green Mountain Power EDI
Sources
Rate Schedules & Tariff Analysis
GMP's C&I tariffs reward demand management and off-peak usage. Mid-size commercial customers face a hard cutover at 7,600 kWh/month or 200 kW to Rate 63/65, where demand charges and time-of-use energy pricing dominate the bill. Rate 63/65 carries a peak demand charge ($19.939/kW) roughly 3.5x its off-peak demand charge, and a 95% power-factor requirement, making demand and power-factor management the largest levers.
Green Mountain Power Rate Schedule List
| Schedule | Applicability |
|---|---|
| Rate 6 - General Service | Small commercial, energy-only, under 200 kW / 7,600 kWh-mo. |
| Rate 8 - General Service (Demand) | Small commercial demand-billed alternative under the same eligibility caps. |
| Rate 63/65 - C&I Time-of-Use | Required for larger C&I loads above 7,600 kWh-mo or 200 kW. |
Green Mountain Power Rate Features & TOU Details
- Hard eligibility cutover at 7,600 kWh/month or 200 kW to Rate 63/65
- Peak vs. off-peak demand and energy differentials on Rate 63/65
- 16-hour weekday peak window (6 AM-11 PM)
- Primary and sub-transmission voltage discounts (4.00% / 21.65% / 23.04%)
- 95% power-factor requirement with penalty on peak investment charge
- Seasonal demand ratchet (Dec-Mar peaks affect 11 subsequent months)
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full Green Mountain Power Rate Optimization Guide →Other Data Access Programs
Powerwall Battery Network
GMP operates a fleet of Tesla Powerwall batteries integrated into the grid, including a frequency regulation pilot with ISO-New England. Participating customers can monitor battery status and grid participation through the Tesla app and GMP portal.
- 01Enroll in a GMP Powerwall lease or bring-your-own-device program.
- 02Monitor battery status via the Tesla app and GMP portal.
- 03View grid participation and earned benefits.
Building Energy Labeling Data
Vermont requires energy labeling for multi-unit buildings (4+ units). GMP provides aggregated usage data to building owners/managers for labeling, offering a path to whole-building data without individual tenant logins.
- 01Building owner/manager requests aggregated usage for the property.
- 02GMP supplies aggregated data consistent with Vermont labeling rules.
- 03Owner uses the data for the building energy label.
Limitations & Considerations
- ⚠No official Green Button (DMD or CMD) / ESPI API.
- ⚠No official developer portal, API documentation, keys, or sandbox.
- ⚠Programmatic access depends on an unofficial community Python client subject to breakage.
- ⚠No formal third-party authorization portal; third-party access is manual or phone-arranged.
- ⚠Interval data is hourly (not 15-minute) and lags by up to a day.
- ⚠Usage export format is limited to CSV.
Green Mountain Power Data Access FAQ
Can a commercial customer get hourly interval data from GMP?▾
Yes. GMP deployed AMI smart meters territory-wide and presents hourly interval data on the My Account Usage dashboard. Commercial customers can export it as CSV using either the 30-day quick download or the advanced custom-date-range export, with 12+ months of history available.
Does GMP offer Green Button or an official API for third parties?▾
No. GMP has not published a Green Button Connect My Data / ESPI API or an official developer portal. The Oracle Utilities platform supports ESPI conceptually, but it is not enabled. The only programmatic option is an unofficial community Python client that uses the customer's own credentials.
How can a consultant access a commercial client's GMP data?▾
There is no formal third-party authorization portal. In practice, the customer exports their CSV usage and PDF bills and shares them, or the consultant calls GMP at (888) 835-4672 to arrange written customer authorization for a data request.
Which rate applies to larger commercial and industrial accounts?▾
Accounts averaging more than 7,600 kWh/month or 200 kW over any four consecutive months are required to take service on Commercial & Industrial Time-of-Use Rate 63/65, which has peak/off-peak demand and energy charges. Smaller commercial accounts take Rate 6 (no demand) or Rate 8 (demand-billed).
Can one login manage multiple commercial premises?▾
Yes. Through 'Manage User Settings' then 'Add/Manage Accounts', a single login can hold multiple GMP account numbers, which is useful for property managers and multi-site commercial customers exporting usage across locations.
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