Hourly **transmission limits** on the **Nova Scotia–Newfoundland and Labrador (NL) intertie** — the Maritime Link / DC tie connecting the island of Newfoundland to mainland Nova Scotia via the Cabot Strait crossing (reported as paths such as WDB–BBK). Published by Nova Scotia Power through OASIS monthly reports.
This file contains TTC (Total Transfer Capability) and ATC variants (FATC, NFATC) for the NL intertie. Each row is one hourly limit record with system element, attribute type, interval timestamps, and MW value. This dataset supports analysis of cross-Gulf transmission capacity, Maritime Link utilization constraints, and available transfer headroom between NL and NS.
**Time coverage:** 2025–2026 only. NS Power has published only one source file for this report family to date (2026 YTD monthly report); no historical NL intertie limit archive is available on the OASIS portal prior to this publication.
**Key columns:**
- `SYSTEM_ELEMENT` — transmission path (e.g. NSSO–NLSO segments)
- `SYSTEM_ATTRIBUTE` — limit type (TTC, FATC, NFATC)
- `START_TIME`, `STOP_TIME` — hour interval
- `ATTRIBUTE_VALUE` — limit in MW
- `ATTRIBUTE_UNITS` — typically MW
- `ANNOTATION`, `TIME_OF_LAST_UPDATE` — metadata from NS Power
- `_source_year` — calendar year of the source file
**Rows:** ~8,189 hourly limit records.
This dataset appears to contain energy system operation data, specifically for power plants in the United States. The columns suggest that it tracks various attributes of these systems, including start and stop times, attribute values, and units of measurement.
The quality scores indicate a high level of overall quality (87.91/100), completeness (88.89/100), uniqueness (99.82/100), but lower validity (85.0/100) and consistency (78.89/100). This suggests that the data is generally accurate, complete, and unique but may require some validation and cleaning to ensure consistency.
1. Analyzing energy system operation patterns
2. Studying power plant performance optimization
1. Potential for missing or inconsistent attribute values
2. Limited geographical scope (US-focused)
energy systems, power plants, _operation_data
Visualize dataset coverage on a map. Geospatial columns (latitude/longitude, lat/lon, x/y) are detected automatically.
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