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South Dakota (US-SD)

Market Type: Hybrid (Limited Retail Choice)
SSS Relevance: ⭐⭐⭐ High
Grid Carbon Intensity: ~124 gCO₂/kWh

SSS Factors: significant nuclear capacity, hydroelectric resources, no mandatory RPS, regulated market structure

1. Overview​

South Dakota operates a regulated electricity market characterized by a high reliance on renewable energy and significant electricity exports. As of 2024, renewable sources (primarily wind and hydropower) accounted for 81% of the state's total in-state electricity generation, ranking South Dakota second in the nation for renewable share, trailing only Vermont 1.

The state's generation mix is dominated by wind power, which supplies 59% of total net generation 1. Hydropower contributes approximately 21%, largely derived from dams on the Missouri River 1. Fossil fuel reliance has shifted in recent years; natural gas surpassed coal in 2023 to become the third-largest source (11% in 2024), while coal's share has declined to 8% 1. Solar remains a small but growing component, representing around 2% of the mix with utility-scale projects like the Wild Springs solar farm coming online in 2024 1.

The market structure is fully regulated, with consumers typically receiving service from Investor-Owned Utilities (IOUs) such as Black Hills Energy and Xcel Energy, or from rural electric cooperatives and municipal utilities 2. South Dakota is a net exporter of electricity, consistently producing more power than it consumes 1. This surplus, combined with the high share of low-carbon generation, results in a low grid carbon intensity estimated at 124 gCO2eq/kWh as of early 2026 3.

Regarding costs, average electricity rates in late 2025/early 2026 were approximately 10.89¢ to 12.86¢ per kWh for residential customers, 10.55¢ per kWh for commercial customers, and 8.28¢ per kWh for industrial customers 4. To support rapid load growth from data centers and mining, the Southwest Power Pool (SPP) has approved the expansion of transmission infrastructure, including 2,333 miles of new lines 1.

2. Market Structure​

South Dakota maintains a traditional, vertically integrated electricity market without retail choice for residential consumers. The state briefly explored restructuring in the late 1990s but abandoned these efforts following the California energy crisis of 2000–2001. State regulators have expressed that there is little perceived benefit to deregulation, preferring a regulated monopoly system 56.

The utility landscape consists of six investor-owned utilities (IOUs), over two dozen electric cooperatives, and numerous municipal utilities. The South Dakota Public Utilities Commission (PUC) regulates rates and services for IOUs but has limited oversight over cooperatives and municipal systems. Major IOUs include Black Hills Energy, MidAmerican Energy Co., Montana-Dakota Utilities Co., NorthWestern Energy, Otter Tail Power Co., and Xcel Energy 78.

While the retail market is regulated, utilities participate in wholesale markets managed by two Regional Transmission Organizations (RTOs):

  • Midcontinent Independent System Operator (MISO): Operates the grid across parts of South Dakota and 14 other states.
  • Southwest Power Pool (SPP): Manages the grid and wholesale markets for a region including South Dakota and parts of 13 other states.

Both entities function as non-profit "air traffic controllers" for the grid, ensuring reliability and running day-ahead and real-time energy markets to match generation with demand. A small region of South Dakota remains outside of these RTOs 910.

⚠️ Note: While natural gas retail choice is technically allowed by law, actual participation is reported to be extremely limited or non-existent in practice 6.

3. Clean Energy Policy​

South Dakota does not have a mandatory clean energy law or a Renewable Portfolio Standard (RPS). Instead, the state operates under a voluntary framework established by the Renewable, Recycled and Conserved Energy Objective (RRCEO) in 2008 11.

Policy Goals and Provisions Under SDCL 49-34A-101, the state set a voluntary goal for 10% of all retail electricity sales to be obtained from renewable, recycled, or conserved energy sources by 2015 12. Eligible resources include wind, solar, hydroelectric, biomass, geothermal, hydrogen, and waste heat recovery. The policy was amended in 2009 to include energy efficiency measures ("conserved energy") toward the goal 11. Utilities are only required to meet the goal if the renewable energy is deemed "reasonable and cost-effective" compared to alternatives. There are no penalties or sanctions for utilities that fail to meet the objective 12.

Reporting and Compliance The South Dakota Public Utilities Commission (PUC) oversees compliance reporting. Retail electricity providers must file annual reports detailing energy sales and progress toward the objective. Utilities may choose not to report compliance even if they meet the threshold, opting instead to sell Renewable Energy Credits (RECs) on the open market 8.

Electricity Mix and Utility Initiatives Despite the lack of a mandate, South Dakota is a national leader in renewable energy generation. In 2024, the state generated enough renewable energy to cover approximately 81% to 92% of its electricity sales 1314. Wind power is the primary source, accounting for about 56.5% of generation, followed by hydropower at roughly 23% 13.

While the state has no net-zero mandate, major utilities have set independent targets:

  • Xcel Energy: Aims for 100% carbon-free electricity by 2050 and an 80% emissions reduction by 2030 (relative to 2005 levels) 15.
  • NorthWestern Energy: Has committed to a net-zero goal and is retiring older resources 15.

⚠️ Note: There is a slight discrepancy in the reported percentage of renewable energy coverage for 2024, ranging from 81% (EIA) to 92% (News Watch), likely due to differences in measuring generation versus retail sales.

Related Policies and Restrictions

  • Property Tax Exemptions: Renewable energy systems smaller than 5 megawatts qualify for a local property tax exemption under SDCL 10-4-44 12.
  • Carbon Capture: In 2025, the state passed laws prohibiting the use of eminent domain for carbon dioxide (CO2) pipelines 8.

4. Utility Landscape​

South Dakota's electricity market is served by a mix of investor-owned utilities (IOUs), rural electric cooperatives, and municipal utilities. The South Dakota Public Utilities Commission (PUC) regulates the state's six investor-owned electric utilities 8.

Investor-Owned Utilities (IOUs) The six IOUs are private enterprises serving specific geographic regions:

  • Xcel Energy (Northern States Power Company): The largest provider by residential sales volume, serving approximately 90,000 customers in eastern cities such as Sioux Falls, Aberdeen, and Brookings 8.
  • Black Hills Energy (Black Hills Power, Inc.): Based in Rapid City, this utility serves the western part of the state and is the largest energy company by revenue, reporting approximately $2.3 billion as of early 2026 168.
  • NorthWestern Energy: A major regional provider serving about 64,800 electric customers across 25 counties in eastern South Dakota 8.
  • MidAmerican Energy Co.: Part of Berkshire Hathaway Energy, this utility provides bundled electric services and is a primary provider for the Sioux Falls region 168.
  • Montana-Dakota Utilities Co. (MDU): Serves customers in the northern and western regions 16.
  • Otter Tail Power Co.: Operates primarily in northeastern South Dakota and leads in state-based power production 168.

Cooperatives and Municipal Utilities The majority of the state's service area is covered by not-for-profit entities, including 32 rural electric cooperatives and 35 municipal electric utilities 14.

  • Rural Electric Cooperatives: These member-owned entities typically serve rural areas. The South Dakota Rural Electric Association (SDREA) represents them legislatively. Most distribution co-ops receive power through Generation & Transmission (G&T) cooperatives such as East River Electric Power Cooperative (the largest non-profit utility by revenue at $335.4 million) or Basin Electric Power Cooperative 178.
  • Municipal Electric Utilities: These community-owned systems are operated by city governments and represented by the South Dakota Municipal Electric Association (SDMEA). Many purchase power through joint action agencies like Missouri River Energy Services (MRES) or Heartland Energy 1814.

5. SSS-Eligible Resources​

ResourceTypeCapacity (MW)SSS EligibleNotes
Pathfinder Nuclear GeneratingNuclear60✅ YesOperating nuclear

⚠️ Future interest in nuclear energy is emerging, with state officials moving toward a feasibility study and utility companies exploring Small Modular Reactors (SMRs) as of early 2026 [1].

6. EAC/REC Registry Infrastructure​

South Dakota utilizes the Midwest Renewable Energy Tracking System (M-RETS) as the primary registry for tracking Energy Attribute Certificates (EACs), commonly referred to as Renewable Energy Certificates (RECs) [1][3]. M-RETS serves as the centralized database for the state, assigning unique serial numbers to each megawatt-hour (MWh) produced to prevent double-counting [1][3].

Due to the state's geographic position spanning both the Midwest and Western power grids, some projects may also be registered in the Western Renewable Energy Generation Information System (WREGIS) [1]. Additionally, the North American Renewables Registry (NAR) acts as a "catch-all" registry that can accept projects from South Dakota if they are not registered with a designated regional system [1][3].

Regulatory Oversight and Reporting​

The South Dakota Public Utilities Commission (PUC) oversees the monitoring of these credits, though it does not operate an independent tracking database [2][3]. The PUC verifies compliance with the state's voluntary Renewable, Recycled, and Conserved Energy Objective, which set a goal for 10% of retail electricity to come from renewable sources by 2015 [2].

Electricity providers are required to file annual reports with the PUC by July 1st, detailing the number of RECs retired and the specific tracking system used [2]. These records provide the audit-ready documentation necessary for sustainability frameworks such as RE100, CDP, and the Science Based Targets initiative (SBTi) [3].

Market Participation​

Entities managing their own RECs generally require an M-RETS account, which involves annual subscription fees and per-certificate transaction costs [2]. Local cooperatives, such as Sioux Valley Energy, facilitate direct REC purchases for customers, while third-party certifications like Green-e Energy are often sought to verify that RECs meet specific environmental and consumer protection standards [2].

7. Grid Emissions​

Grid Carbon Intensity: 124 gCO₂eq/kWh (annual average)

Generation Mix​

Scope 2 Reporting​

  • SB 253 requires Scope 2 reporting for companies >$1B revenue

Source: EPA eGRID, EIA, state regulatory filings

References​

Sources & Last Updated​

Research Date: 2026-03-10
Data Sources: EIA, EPA eGRID, state regulatory filings, SerpAPI research aggregation

This page was generated using automated research and may contain inaccuracies. Verify critical data with primary sources.

Footnotes​

  1. U.S. Energy Information Administration (EIA) (.gov) ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7

  2. Find Energy ↩

  3. Low-Carbon Power ↩

  4. app.insightengine.org ↩

  5. Quick Electricity ↩

  6. Federal Reserve Bank of Minneapolis ↩ ↩2

  7. Energy Star (.gov) ↩

  8. South Dakota Public Utilities Commission (.gov) ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10

  9. Wikipedia ↩

  10. Federal Energy Regulatory Commission (.gov) ↩

  11. Database of State Incentives for Renewables & Efficiency ↩ ↩2

  12. South Dakota Legislature (.gov) ↩ ↩2 ↩3

  13. U.S. Energy Information Administration (.gov) ↩ ↩2

  14. South Dakota News Watch ↩ ↩2 ↩3

  15. Xcel Energy ↩ ↩2

  16. Clean Energy Transition Institute ↩ ↩2 ↩3 ↩4

  17. NCBA CLUSA | National Cooperative Business Association ↩

  18. www.sdpublicpower.org ↩