DTE Energy, the utility that powers Detroit
DTE Electric is one of the two largest electric utilities in Michigan, serving 2.3 million customers across southeast Michigan, including the Detroit metropolitan area, Ann Arbor and a large rural footprint. After years of below-average reliability, the company is in the middle of a major grid rebuild that is starting to show measurable results, with 2025 reported as DTE's best reliability year in nearly two decades.
- The size of the DTE Electric network and the regions it covers
- Why power outages happen on the DTE grid and what's changing
- The $10 billion investment plan running from 2025 to 2029
- How DTE uses smart devices, automation and renewables to reduce outage time
A 2.3 million-customer grid built on aging overhead lines
DTE Electric covers a 7,600 square mile service territory in southeast Michigan, with the Detroit area at its core and a footprint that extends to Ann Arbor, Port Huron, Monroe and the Thumb region. Its sister company DTE Gas serves around 1.3 million natural gas customers in a separate Michigan footprint.
Key figures for the electric network:
- Around 2.3 million electric customers in southeast Michigan.
- A 7,600 square mile service area covering the Detroit metropolitan region and surrounding counties.
- Renewables now generate enough electricity to power more than 800,000 Michigan homes.
- DTE Gas separately serves about 1.3 million natural gas customers across Michigan.
DTE Electric is regulated by the Michigan Public Service Commission (MPSC) and is a subsidiary of DTE Energy (NYSE: DTE), headquartered in Detroit.
Why southeast Michigan loses power more often than the national average
Outages on DTE's territory are dominated by weather and aging infrastructure. The grid runs through dense tree cover in residential southeast Michigan, which makes vegetation-related faults a recurring driver of outages.
Severe weather
Thunderstorms in summer, ice storms in winter and high-wind events from Great Lakes systems are the largest single source of outages on the DTE grid. Major storm events can knock out power for hundreds of thousands of customers at once and drive most of the multi-day restoration work each year.
Trees and vegetation
Trees falling on overhead lines remain one of the largest causes of unplanned power outages on the DTE network. Tree trimming is one of the four pillars of the company's reliability plan, and DTE has been expanding its vegetation management program every year as part of the rebuild.
Aging infrastructure and the 4.8 kV grid
Parts of DTE's distribution system, especially the older 4.8 kilovolt grid in Detroit, were built decades ago and have higher failure rates than newer 13.2 kV circuits. Converting and rebuilding these older circuits is a major focus of current investments and a key reason the company has filed multi-year recovery mechanisms with the MPSC.
Equipment failures
Transformer failures, broken poles, faulty switches and substation issues continue to drive a steady share of outages, particularly in segments of the grid that have not yet been hardened or rebuilt under the current Distribution System Plan.
The $9 billion plan to cut DTE outage time in half
DTE has placed grid reliability at the center of its capital plan. The company describes a four-point program that combines smart-grid technology, modernization of existing infrastructure, full rebuild of weaker grid segments, and expanded tree trimming.
DTE reliability progress (2023 to 2025)
70% reduction in customer outage time between 2023 and 2024.
Additional 60% reduction between 2024 and 2025.
DTE reached the top quartile of U.S. utilities for restoration speed in 2025 for the first time in at least two decades.
Targets by end of 2029: 30% fewer outages and outage duration cut in half.
Headline numbers from the current investment cycle:
- More than $5 billion already invested in the grid over the past five years.
- More than $10 billion planned between 2025 and 2029 under the current Distribution System Plan.
- Run rate of more than $1 billion per year on grid reliability work alone.
- Investment recovery mechanism approved by the MPSC for distribution upgrades, including circuit conversion, sub-transmission redesign, breaker replacement and underground residential distribution.
- MPSC approved an additional $242.4 million in February 2026 specifically for reliability and grid upgrades.
Tree trimming, automated reclosers and pole upgrades
Smart devices and self-healing grid
DTE is rolling out automated reclosers, sectionalizing switches and FLISR-style fault location systems across the territory. The goal is to fully automate the grid by 2029, so that when a fault occurs, the damaged section can be isolated and power rerouted in seconds. Many local outages that used to last more than an hour can now be limited to a few minutes for most customers.
Systems Operations Center and ADMS
DTE has launched a new Systems Operations Center and an advanced distribution management system (ADMS) that gives operators a unified view of the grid in real time. This is the foundation that lets smart devices in the field actually deliver shorter restoration times.
Grid rebuild and 4.8 kV conversion
DTE is rebuilding significant portions of the distribution grid, with a particular focus on converting older 4.8 kV circuits in Detroit to higher-voltage 13.2 kV configurations. This conversion reduces failure rates, increases capacity and prepares the grid for higher load growth from electrification and data centers.
Vegetation management program
Trimming trees on a multi-year cycle is one of the four pillars of DTE's reliability plan. The program has been expanded steadily and is one of the main drivers behind the recent reductions in outage duration.
Renewables and battery storage
DTE commissioned three new solar parks in 2025 and is converting its Belle River Power Plant from coal to natural gas. The Trenton Channel Energy Center, scheduled to come online at the end of 2026, is set to be the largest standalone battery energy storage facility in the Great Lakes region. Storage on the grid will help cover peaks and reduce supply-driven outages on hot summer days and cold snaps.
DTE Insight app, outage map and bill assistance
DTE outage map
DTE publishes a public outage map updated in near real-time. Customers can look up their address or zip code, see the size of the affected area, estimated restoration times and the status of crews on the ground. The DTE outage map is the main reference for customers during major storms.
DTE Insight app and alerts
The DTE Insight mobile app gives access to the outage map, lets customers report a power outage and pushes proactive SMS, email and app notifications. Alerts include estimated restoration times and updates as work progresses on the affected circuit.
Power Improvements map
Separately from the live outage map, DTE publishes a Power Improvements map that shows where grid hardening, circuit conversion, undergrounding and tree trimming work is planned, in progress, or completed across southeast Michigan.
EV charging programs
DTE runs make-ready EV charging programs that help fund the upgrades needed to support new charging stations across the territory. The MPSC has approved $17.8 million for EV charging infrastructure investments to help the grid handle accelerating EV adoption.
Income-qualified assistance
DTE participates in the Michigan Energy Assistance Program (MEAP) and offers home weatherization, efficiency rebates and bill assistance for income-qualified customers, in line with MPSC guidelines.
Consumers Energy and Michigan's main ISPs
For a wider view of how the U.S. electric grid works and why outages happen, see the U.S. power outage page. The other major Michigan utility, Consumers Energy, covers the rest of the Lower Peninsula. For internet outages in the same southeast Michigan footprint, the most common providers are AT&T, Spectrum and Xfinity.