South Portland Electricity Rates
- Out of 9 plans in South Portland, today’s cheapest electric rate is 14.0¢/kWh.
- The average South Portland electricity rate across competing providers is 16.48¢ per kWh at 1,000 kWh.
- A typical South Portland household pays about $165 per month for electricity at 1,000 kWh.
Cheapest Electricity Plans in South Portland
Sorted by price at 1,000 kWh. Plans with bill credits can cost more at other usage levels — check the EFL for the full breakdown.
Today's Cheapest South Portland Electricity Rates
The table below shows the single cheapest plan from each provider we list in South Portland. All rates are at 1,000 kWh monthly usage.
| Plan Name | Plan Length | Rate at 1,000 kWh | Sign up |
|---|---|---|---|
| CleanSky Energy – CleanSky Energy 12 Months | 12 months | 13.99¢/kWh | Continue |
| Ambit Energy – Ambit Energy Maine State Select | 12 months | 14.50¢/kWh | Continue |
| XOOM Energy – XOOM Energy Variable | Monthly | 17.19¢/kWh | Continue |
| Think Energy – Think Energy 12 Months | 12 months | 17.20¢/kWh | Continue |
| Electricity Maine – Electricity Maine 12 Months | 12 months | 17.99¢/kWh | Continue |
October Electricity Plans in South Portland
South Portland has a deregulated electricity market, which means you pick your provider and plan. Here are some of the cheapest options available today:
- CleanSky Energy – CleanSky Energy 12 Months (12-month): 13.99¢/kWh at 1,000 kWh.
- Ambit Energy – Ambit Energy Maine State Select (12-month): 14.50¢/kWh at 1,000 kWh. Locks in your rate for 12 months.
South Portland Electricity Suppliers
We compare rates from certified Competitive Electricity Providers active in Central Maine Power’s South Portland territory. Every supplier below offers plans to South Portland residents today.
South Portland Business Electricity Rates
South Portland’s economy is driven by the Maine Mall retail corridor, the oil terminal at Portland Harbor, and its role as a Portland suburb with a growing residential and commercial base. Commercial customers access deregulated CEP rates through the Central Maine Power territory.
Business electricity pricing factors in peak demand, load factor, and total volume. A quick quote is the only way to see what rates are available for your specific business profile.
South Portland Electricity FAQ
Common questions about electricity rates, plans, and suppliers in South Portland and the Central Maine Power service area.
Is South Portland a deregulated electricity market?
Yes, South Portland homes can pick a plan from a competitive provider or stay on Central Maine Power's Standard Offer. Central Maine Power delivers the power either way.
What is the average electricity rate in South Portland?
About 16.48¢/kWh at 1,000 kWh a month, averaged across the 9 plans we list for South Portland today. The most common prices fall between 16¢ and 18¢, and the cheapest is 13.99¢. Those are supply prices; Central Maine Power's delivery charges add about $147 a month at 1,000 kWh.
Source: State of Maine, July 2026
What is the real price per kWh in South Portland once delivery is added?
About 23.43¢ per kWh, supply and delivery together, based on what homes on Central Maine Power's default rate paid on average in 2024 (federal EIA data). The plan prices you shop for cover supply only; the lowest in South Portland today is 13.99¢, before Central Maine Power's delivery charges.
Source: EIA, 2024
What is Central Maine Power's monthly customer charge in South Portland?
Central Maine Power charges South Portland homes a fixed $27.37 a month, even if they use no electricity. It's part of delivery, so it's the same with any competitive provider. Delivery also adds 11.959¢ for each kWh you use.
Source: State of Maine, July 2026
How much did Central Maine Power's last rate increase add to South Portland bills?
CMP's July 2025 compliance filing added $4.91 a month to a typical bill.
Source: State of Maine, 2025
