Delmarva Power Rate Selection Guide
Delmarva Power & Light is an Exelon investor-owned utility delivering electricity and natural gas across Delaware and the Maryland Eastern Shore, serving roughly 555,000 electric customers. Both Delaware and Maryland have deregulated electric supply, so customers can take default Standard Offer Service or shop a competitive supplier while Delmarva provides regulated delivery.
Delmarva Power Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| SGS-ND | Commercial | Customer charge + per-kWh delivery; SOS small-commercial supply ~$0.110/kWh summer (Jun 2026) | Small non-demand businesses |
| MGS-S | Commercial | Customer + per-kWh delivery + demand per kW | Medium commercial with moderate demand |
| LGS-S / GS-P | Industrial | Demand-weighted delivery + competitive supply | Large facilities; shop competitive supply |
Market Overview
Delmarva delivers electricity and gas as the regulated utility; electric generation supply is competitive in both Delaware and Maryland. Default supply is Standard Offer Service (SOS), priced via DPSC-overseen auctions in Delaware (effective each June 1) and Maryland equivalents. C&I customers can shop licensed suppliers while Delmarva continues delivery and billing.
Need to pull your actual usage data to compare rates? See the Delmarva Power Data Access Guide →
Current Rate Schedules
Delmarva electric delivery and gas rates are regulated by the Delaware PSC (and Maryland PSC); generation supply is competitive. Per filings to the Delaware PSC (Docket No. 26-0389, filed March 28, 2026), default Standard Offer Service supply prices rose ~18-20% effective June 1, 2026. For residential SOS, summer energy went from $0.093569/kWh to $0.111063/kWh (+19%) and winter from $0.094804/kWh to $0.114049/kWh (+20%); for small commercial SOS, summer went from $0.093404/kWh to $0.110159/kWh (+18%) and winter from $0.085805/kWh to $0.100515/kWh (+17%). The Renewable Compliance Charge decreased ~11% from $0.005797/kWh to $0.005172/kWh. Separately, Delmarva filed a $67.8M Delaware electric base-rate increase in January 2026 (interim rates effective ~July 9, 2026). C&I delivery charges vary by schedule; consult the current Delaware electric tariff for exact distribution and demand charges.
Effective: June 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Small General Service (SGS-ND) | commercial | Small non-demand commercial customers in Delaware. | Monthly customer charge + per-kWh delivery charge + riders; no demand charge. Default supply via SOS (small commercial SOS summer ~$0.110159/kWh, winter ~$0.100515/kWh effective June 1, 2026). Verify delivery charges in the current DE tariff. | — |
| Medium General Service - Secondary (MGS-S) | commercial | Medium commercial customers at secondary voltage. | Customer charge + per-kWh delivery + demand charge per kW + riders. Default supply via small commercial SOS unless shopped. Verify exact $ delivery/demand charges in the current DE tariff. | — |
| Large General Service - Secondary (LGS-S) | industrial | Large commercial/industrial customers at secondary voltage. | Customer charge + per-kWh delivery + demand charge per kW (often ratcheted) + riders. Larger loads typically shop competitive supply. Verify exact $ charges in the current DE tariff. | — |
| General Service - Primary (GS-P) | industrial | Large customers taking service at primary voltage. | Customer charge + per-kWh delivery + demand charge per kW + riders, with a primary-voltage discount. Verify exact $ charges in the current DE tariff. | — |
| Large Load Tariff (proposed, 25 MW+) | industrial | Very large customers with monthly maximum demand of 25 MW or greater (proposed, filed Dec. 19, 2025). | Proposed dedicated large-load tariff with special demand and cost-allocation terms; under DPSC review. Verify status and terms in DPSC Docket 25-0826. | — |
Rate Recommendations by Use Case
Small non-demand business
Small commercial customers on SGS-ND taking default SOS supply.
SGS-ND has no demand charge, so kWh delivery plus SOS supply dominate the bill; after the June 2026 SOS jump, a fixed competitive offer can stabilize budgets.
- Enroll in Green Button to track usage
- Compare fixed supplier offers against the SOS Price to Compare
- Watch seasonal SOS summer/winter rate differences
Medium / large facility with demand charges
C&I on MGS-S, LGS-S, or GS-P with material demand (kW) charges.
Demand charges and competitive supply both drive cost; managing monthly peaks and locking a fixed supply contract hedge the June 2026 SOS increase.
- Hedge with a fixed competitive supply contract
- Use hourly interval data to manage coincident peaks and capacity tags
- Evaluate primary-voltage (GS-P) service for discounts
Multi-site portfolio / benchmarking
Organizations managing multiple Delmarva accounts needing aggregated data.
EUDS aggregates building usage and syncs to ENERGY STAR Portfolio Manager; the Agency Access Portal supports property managers and institutional accounts.
- Enroll sites in Exelon EUDS
- Use the Agency Access Portal for managed accounts
- Connect EUDS to Portfolio Manager for EUI benchmarking
Historical Rate Trends
Delmarva generation supply (SOS) resets via DPSC-overseen auctions, typically each June 1 in Delaware; delivery rates change through base-rate cases at the Delaware/Maryland PSC. Supply costs have risen sharply driven by PJM wholesale energy and capacity prices.
June 1, 2026
Standard Offer Service supply increase: residential summer $0.093569 to $0.111063/kWh (+19%), winter $0.094804 to $0.114049/kWh (+20%); small commercial summer $0.093404 to $0.110159/kWh (+18%), winter $0.085805 to $0.100515/kWh (+17%). Renewable Compliance Charge decreased $0.005797 to $0.005172/kWh (-11%).
+18-20%July 9, 2026
Delaware electric base-rate increase of $67.8M ($44.6M incremental revenue plus $23.2M DSIC transfer) filed December 9, 2025 (PSC Docket 26-0148); interim rates effective July 9, 2026 subject to refund. Average residential bill impact ~4.13% ($6.42/month at 810 kWh); final rates pending Delaware PSC decision expected late 2026.
+4.13% (avg residential bill)Overall trend: Sharp upward pressure on supply: June 1, 2026 SOS increases of ~18-20% (a typical 811 kWh/month residential customer sees roughly +$14.64/month, ~9% overall). A $67.8M Delaware base-rate increase was filed in January 2026 with interim rates expected ~July 9, 2026.
Next expected change: Delaware base-rate interim rates ~July 9, 2026 (PSC Docket 26-0148); next SOS supply reset effective June 1, 2027.
Cost Optimization Strategies
With Delaware SOS supply up ~18-20% in June 2026, the strongest levers for C&I customers are competitive supply procurement, demand management on kW-charged schedules, and interval-data peak targeting via Green Button/Opower.
Shop competitive supply
For: All C&I customers in DE and MD
Compare the SOS Price to Compare against fixed and indexed competitive supplier offers; SOS increases make fixed contracts more attractive for budget certainty.
Demand (kW) management
For: MGS-S, LGS-S, GS-P
Flatten monthly peak demand on MGS-S/LGS-S/GS-P schedules where demand charges are material; stagger startups and shift loads off peak.
Interval-data peak targeting
For: C&I with AMI meters
Use Green Button hourly data or the Opower API to identify and shave PJM coincident peaks (capacity tags) and improve load factor.
Voltage-level optimization
For: Large C&I
Where feasible, take primary-voltage service (GS-P) to capture tariff voltage discounts.
To implement these strategies, you need your 15-minute interval data. Learn how to download Delmarva Power interval data →
Deregulated Market Shopping
Delaware and Maryland are deregulated electric supply states. Delmarva C&I customers can stay on default Standard Offer Service or buy generation from a licensed competitive supplier while Delmarva continues delivery and billing. With SOS up ~18-20% in June 2026, shopping is especially worth evaluating.
How to Compare Delmarva Power Suppliers
- 01Identify your rate schedule and the SOS Price to Compare on your bill
- 02Pull 12 months of interval/usage data via Green Button or EUDS
- 03Solicit fixed and indexed offers from licensed suppliers and compare to SOS
- 04Confirm term, price, and switching mechanics before enrolling
Contract Terms for Delmarva Power Supply Agreements
- Fixed vs. index pricing
- Term length (12-36 months typical for C&I)
- Early-termination fees
- Swing/bandwidth tolerance on usage
Common Pitfalls When Shopping Delmarva Power Rates
- Variable/indexed offers can spike with PJM wholesale prices
- Auto-renewal to higher variable rates at term end
- Early-termination penalties
- SOS itself is volatile (the June 2026 reset added ~18-20%)
Frequently Asked Questions
Is electricity supply deregulated for Delmarva business customers?▾
Yes. Delmarva delivers electricity (and gas) as the regulated utility, but electric generation supply is competitive in both Delaware and Maryland. C&I customers can take default Standard Offer Service or buy from a licensed competitive supplier. Compare options via the Delaware PSC Customer Electric Choice page.
How much did Delmarva supply rates increase in 2026?▾
Per Delaware PSC Docket 26-0389, Standard Offer Service supply prices rose about 18-20% effective June 1, 2026 (residential summer from $0.093569 to $0.111063/kWh; small commercial summer from $0.093404 to $0.110159/kWh). A typical residential customer (~811 kWh/month) sees roughly +$14.64/month, about 9% overall. A separate $67.8M Delaware base-rate increase was filed in January 2026.
How does my business get interval (hourly) usage data?▾
Delmarva AMI meters record hourly interval data. Businesses can download Green Button XML from MyAccount, pull reads via the Opower API for smart-home/IoT platforms, or aggregate multiple sites through Exelon EUDS with CSV/Excel export and ENERGY STAR Portfolio Manager sync.
Can a consultant or energy manager access our Delmarva data?▾
Yes. Customers can sign the Update Contractor Data Access Authorization form, invite a consultant as a user in EUDS, or share Green Button XML. Approved service providers in the Energy Savings for Business program can access authorized data, and licensed suppliers exchange usage via EDI 867/867HI transactions.
Does Delmarva offer a developer API?▾
Delmarva does not publish a general developer API. Programmatic access is available through the Opower REST API (OAuth 2.0) used by platforms like Home Assistant, the Exelon EUDS for C&I portfolios, and Green Button XML downloads.
Automate Delmarva Power Rate Analysis with Nectar
Nectar continuously monitors your Delmarva Power rate options and alerts you when a better schedule is available. Save 10-30% on energy costs.
Nectar for Energy & Sustainability Teams
Managing utility costs for commercial or industrial buildings? Nectar offers a free rate analysis — we'll review your current rate schedules and identify where switching tariffs or shifting load can save 10-30%.
Get a Free Rate AnalysisNectar for Energy Brokers & Consultants
Advising clients on rate optimization? Nectar works with energy consultants who need reliable interval data and automated rate comparison tools.
Partner with Us