USUS Grid ExplorerInfrastructure intelligence
Preliminary 2025 facility recordOperating

Locust Grove, OK · EIA plant 2980

Markham

Markham is a hydro power facility in Locust Grove, OK, with 128 MW of operating capacity.

Open on mapView OK profileOpen EIA source
Operating capacity128 MW4 operating generators
Proposed capacity0 MW0 proposed generators
UtilityGrand River Dam AuthorityEIA-reported operator
Balancing authoritySWPPSouthwest Power Pool

Capacity profile

Fuel and technology

Nameplate capacity
Operating
Hydro128 MW
ProposedNo proposed capacity reported
Reported technologiesConventional Hydroelectric

Nearby in OK

Related facilities

OK · 4.9 miSalina259 MW →OK · 5.3 miChouteau1,070 MW →OK · 6.4 miGrand River Energy Center Solar84 MW →OK · 6.6 miGREC1,194 MW →

Source quality

Preliminary facility data

This page uses the EIA-860 2025 Early Release. EIA identifies the release as preliminary, so it should not be used for official state or national aggregation. Capacity is nameplate capacity, not real-time output or annual generation.

Read methodologyEIA-860 source