Access Southwest Power Pool (SPP) Integrated Marketplace day-ahead and real-time LMP data via the SPP Marketplace portal data feeds

Steps

1. Navigate to https://marketplace.spp.org and access the Real-Time Market Data and Day-Ahead Market sections; SPP publishes LMP data as downloadable CSV files updated at regular intervals — no API key is required for public data access.
2. For day-ahead LMPs, download the 'DA LMP By Location' report from the Day-Ahead Market section; the CSV contains columns for GMTIntervalEnd (UTC timestamp), settlement_location (pricing node), LMP (total), MLC (marginal loss component), MCC (marginal congestion component), and MEC (marginal energy component).
3. For real-time LMPs, download the 'RT LMP By Location' report from the Real-Time Balancing Market section; data is published at 5-minute intervals for each operating interval, approximately 5 minutes before interval end.
4. Construct a download URL by inspecting the network requests on the marketplace portal; SPP file URLs follow a consistent pattern with date and market type embedded in the path — automate downloads by constructing URLs for the desired date range and fetching each file.
5. Parse the CSV response: SPP uses GMT timestamps (GMTIntervalEnd) — convert to local Prevailing Central Time for display but store and process in UTC; note that SPP's market operates in the Central timezone for operational purposes.
6. For historical analysis, SPP retains several months of rolling data on the portal; longer historical archives may require a data request to SPP Market Operations — document the data retention period from the SPP market participation guide before committing to a historical backfill project.