Southern Indiana Gas & Electric Co. (CenterPoint Energy Indiana South) Rate Selection Guide
Southern Indiana Gas & Electric Company (SIGECO), operating as CenterPoint Energy Indiana South (formerly Vectren South), is an investor-owned utility serving roughly 150,000 electric and 110,000 gas customers across southwestern Indiana. Rates are regulated by the Indiana Utility Regulatory Commission (IURC); Indiana is a vertically integrated, non-shopping market, so there is no retail supplier choice for electricity.
Southern Indiana Gas & Electric Co. (CenterPoint Energy Indiana South) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Small General Service (SGS) | Commercial | Customer charge + energy charge ($/kWh) + riders (see tariff) | Small storefronts, offices, and light commercial loads |
| Demand General Service (DGS) | Commercial | Customer + demand ($/kW) + energy ($/kWh) + riders (see tariff) | Mid-size commercial with meaningful peak demand |
| Large Power (LP) | Industrial | Customer + demand ($/kW) + energy ($/kWh), voltage-adjusted (see tariff) | Large manufacturing / industrial loads |
| High Load Factor (HLF) | Industrial | Demand + energy structured for high load factor (see tariff) | 24/7 high-load-factor industrial operations |
Market Overview
SIGECO is a regulated investor-owned utility under IURC jurisdiction. Electricity is bundled with no retail supplier choice. Large gas C&I customers may elect Gas Transportation service to procure their own gas commodity while CenterPoint provides delivery.
Need to pull your actual usage data to compare rates? See the Southern Indiana Gas & Electric Co. (CenterPoint Energy Indiana South) Data Access Guide →
Current Rate Schedules
SIGECO's electric tariff (I.U.R.C. No. E-14) became effective February 13, 2025, following IURC approval (Cause No. 45990, Feb 3, 2025) of an $80.0 million (11.1%) revenue increase phased in over two steps (March 2025 and March 2026). Commercial and industrial customers are served on Small General Service (SGS), Demand General Service (DGS), Large Power (LP), and High Load Factor (HLF) schedules. Specific per-kWh energy charges and per-kW demand charges by schedule are set in the tariff book; verify current values there as fuel/tracker riders adjust periodically.
Effective: February 13, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Small General Service (SGS) | commercial | Smaller commercial customers below the demand thresholds for demand-metered service. | Monthly customer charge plus energy charge ($/kWh); applicable fuel and tracker riders. Specific rates per the SIGECO electric tariff (I.U.R.C. No. E-14). | — |
| Demand General Service (DGS) | commercial | Commercial customers with demand large enough to require demand metering. | Customer charge + demand charge ($/kW of billing demand) + energy charge ($/kWh) + riders. Specific charges set in the tariff book. | — |
| Large Power Service (LP) | industrial | Large industrial customers with substantial demand, often taking primary or sub-transmission service. | Customer charge + demand charge ($/kW) + energy charge ($/kWh), with voltage-level adjustments and riders. Specific charges set in the tariff book. | — |
| High Load Factor Service (HLF) | industrial | Very large, high-load-factor industrial customers operating near-continuously. | Demand and energy charges structured to reward high load factor; primary/sub-transmission service. Specific charges set in the tariff book. | — |
| Gas — Large Volume / Transportation | industrial | Large C&I gas customers eligible to transport third-party-supplied gas over CenterPoint's distribution system. | Delivery (distribution) charge with customer-procured commodity; bundled sales for standard customers. See SIGECO gas tariff (I.U.R.C. No. G-19). | — |
Rate Recommendations by Use Case
Mid-size commercial (offices, retail, light manufacturing)
Demand-metered commercial accounts under DGS where peak kW drives a large share of the bill.
DGS bills on $/kW billing demand plus energy; managing coincident peak yields the fastest savings.
- Pull interval/demand data via CES Online
- Stagger HVAC and equipment startups
- Watch the Fuel Adjustment Clause and TDSIC rider line items
Large industrial / manufacturing
High-demand industrial loads taking Large Power service.
LP/HLF are demand-driven; improving load factor can move a site to HLF for better effective rates.
- Improve load factor to qualify for HLF
- Evaluate primary/sub-transmission voltage service
- Use UHIT for automated interval data feeds
Multi-site / property portfolios
Customers operating several premises across the territory.
Consolidated billing and benchmarking simplify management and surface outliers.
- Enroll in free Summary Billing (3+ accounts)
- Use the Energy Data Portal for ENERGY STAR benchmarking
- Authorize a consultant via Authorized User or LOA
Large natural gas C&I
Large-volume gas customers seeking commodity savings.
Gas Transportation lets eligible customers procure their own commodity while CenterPoint delivers.
- Confirm transportation eligibility thresholds
- Compare marketer pricing vs bundled GCA
- Coordinate nominations with a qualified marketer
Historical Rate Trends
In Cause No. 45990, the IURC approved an $80.0 million (11.1%) annual revenue increase effective with the tariff filed February 13, 2025, phased in across two steps (March 2025 and a second step in early 2026). The Commission reduced CenterPoint's authorized ROE from 10.4% to 9.8%.
February 13, 2025
IURC Cause 45990: $80.0M (11.1%) revenue increase, two-step phase-in; ROE reduced to 9.8%.
+11.1%Overall trend: Rising — CenterPoint customers have carried among the highest electric bills in Indiana; ongoing TDSIC and generation investments continue to pressure rates.
Next expected change: Second rate-case step takes effect in early 2026; periodic fuel and tracker (TDSIC) adjustments occur between cases.
Cost Optimization Strategies
For C&I customers, the largest savings levers are demand-charge management and load-factor improvement, given DGS/LP/HLF schedules are demand-driven. Interval-data-informed strategies require pulling 15-minute data via CES Online or UHIT.
Peak demand management
For: DGS, LP commercial/industrial
Stagger equipment startups and shift flexible loads off coincident peaks to lower billed $/kW demand on DGS/LP schedules.
Load-factor improvement / HLF qualification
For: Large industrial
Smoothing consumption to raise load factor can qualify large customers for High Load Factor (HLF) treatment with more favorable demand/energy structure.
Interval-data-driven monitoring
For: All C&I
Pull 15-minute interval data via CES Online or UHIT to identify demand spikes, verify tracker/fuel charges, and target efficiency projects.
Gas Transportation procurement
For: Large gas C&I
Eligible large gas customers can buy commodity from third-party marketers under Gas Transportation service while CenterPoint delivers, potentially beating bundled sales pricing.
To implement these strategies, you need your 15-minute interval data. Learn how to download Southern Indiana Gas & Electric Co. (CenterPoint Energy Indiana South) interval data →
Frequently Asked Questions
Can my energy consultant pull our facility's interval and demand data?▾
Yes, with authorization. Enroll the account in CES Online for invoice and historical usage/demand data, or have an authorized retailer/consultant use the UHIT API. Each account requires a customer Letter of Authorization. Indiana functionality is more limited than CenterPoint's Texas markets, so allow lead time and contact cr.support@centerpointenergy.com.
Is Green Button available for our Indiana facilities?▾
No. CenterPoint Energy Indiana South does not implement Green Button Download My Data or Connect My Data. For programmatic data, use UHIT or the Energy Data Portal under a Letter of Authorization, or export from CES Online.
Can we choose a competitive electricity supplier in Indiana?▾
No. Indiana is a vertically integrated, regulated market with no retail electric choice. All electric customers in the territory are served on IURC-approved bundled tariffs. Large natural gas customers may, however, elect Gas Transportation service to buy their own gas commodity.
How much interval-meter history can we get for a load study?▾
My Account exposes up to 24 months of monthly usage. For 15-minute interval and demand data, submit a Historical Usage request through CES Online or UHIT with a Letter of Authorization; longer histories may be available on request, typically delivered in 5-10 business days.
What rate schedules apply to commercial and industrial accounts?▾
Under the SIGECO electric tariff (I.U.R.C. No. E-14), C&I service is taken on Small General Service (SGS), Demand General Service (DGS), Large Power (LP), and High Load Factor (HLF) schedules. Classification depends on demand and load factor; see the tariff book for current charges.
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