The United Illuminating Company

UI does not publish a residential EV-only time-of-use rate. EV owners can instead opt into Rate RT, UI's voluntary whole-house Time of Day rate. On-peak hours run noon to 8 p.m. on weekdays; every other hour, including all weekend hours, is off-peak. Charging overnight or on weekends falls in the cheaper off-peak window, and UI says the customers who save on Rate RT typically use 75 percent or more of their electricity off-peak; a household with heavy daytime use could see its bill rise. Supply prices change during the year, so confirm current Rate RT pricing before switching. Business customers who meter their chargers separately can take EV versions of Rate GS or Rate GST.

UI's EV programs run under Connecticut's statewide EV Charging Program, the same framework Eversource Connecticut uses. Most residential customers who enroll an existing qualified smart charger or a connected EV get a $100 enrollment incentive. Households at or below 300 percent of the Federal Poverty Level, or in a High Poverty Low Opportunity census tract, can instead get up to $1,500 toward a new qualified smart charger and wiring, applied for within 90 days of purchase; 2026 funding is limited, and applicants go on a waitlist once it runs out. Either upfront payment requires staying in the managed charging program, which keeps charging out of the 3 p.m. to 9 p.m. weekday peak: the Baseline tier pays $10 a month, up to $120 a year, for months with 80 percent or more of charging off-peak, and the Advanced tier pays $25 a month, up to $300 a year, for letting UI schedule charging. The commercial make-ready program pays 50 percent of eligible charger costs plus 100 percent of eligible make-ready costs, up to $20,000 per site for Level 2 and $150,000 for DC fast charging, with higher caps of $40,000 and $250,000 in underserved communities.

UI's territory is small and dense, covering coastal southern Connecticut around New Haven and Bridgeport in Fairfield and New Haven counties rather than the whole state. Connecticut's EV Charging Program is statewide, so UI runs it on the same framework and eligibility rules as Eversource Connecticut, with each utility handling its own enrollment and payments. Public Act 25-173, signed July 1, 2025, reduced the 2026 incentive budget. Program money runs on annual budgets, and commercial waitlists are canceled at the end of each calendar year, so timing matters for applicants.