Power is local at the last mile
Discussions of the electric grid often focus on power plants and long transmission lines. For a redevelopment project the part that matters most is the distribution system: the local lines, substations and transformers that bring electricity down to buildings. That network was sized for the loads of the buildings that existed when it was built, and it adjusts slowly.
This is why electricity can quietly decide the pace of renewal. A site with permits, financing and a design may still wait on the electric utility to confirm service and build whatever is needed to provide it.
How distribution is organized
In broad terms, power travels in steps.
- Transmission carries high-voltage electricity over long distances to a substation.
- At the substation, voltage is lowered and power is sent out on feeders, medium-voltage lines that run along streets, overhead or underground.
- Along the feeder, transformers step the voltage down again to levels used by customers. Houses may be served by a pole-mounted or pad-mounted transformer, while larger buildings may have their own transformer, sometimes in a vault inside or beside the building.
- A service connection carries power to each building’s meter.
Each stage has a limit. A transformer can serve only so much load before overheating. A feeder can carry only so much current. A substation has a fixed total capacity, often with spare capacity reserved so that service can be maintained if one component fails. Utilities generally plan against peak demand, which may occur on the hottest afternoon or coldest evening.
What new buildings change
Redevelopment often replaces low-density uses with higher-density ones. A few stories of apartments can draw much more power than the single-story structure they replace. Several factors push demand up or down.
- Building size and use. Offices, labs, restaurants and data-heavy tenants use differently than housing.
- Heating and cooking. All-electric buildings place heavier winter demand on the grid than buildings that burn gas for heat, particularly in cold climates.
- Air conditioning. Cooling load drives summer peaks in many regions.
- Vehicle charging. Chargers for electric vehicles can add significant load, especially when many cars charge at the same time in the evening.
- Efficiency and on-site generation. Efficient buildings, heat pumps and rooftop solar or batteries can reduce or reshape peak demand, though results vary.
Whether the existing equipment can handle the change is a capacity question, and utilities typically study each larger request.
Why upgrades take time
When a project needs more power than the local system can supply, the utility may need to add or replace a transformer, extend or upgrade a feeder, or in larger cases expand a substation. These steps involve design, permits, right-of-way, equipment orders and construction. Large equipment can have long lead times, and a substation upgrade can take years. Smaller changes may be quicker, but are still not instantaneous.
A developer may therefore learn late in the process that the cost or schedule for electrical service is much larger than expected. Early conversations with the utility, ideally before the design is final, are widely advised for that reason. Rules about who pays differ: in some places the project pays for the work needed to serve it, and in others costs are shared across all ratepayers, and either can be contentious.
Overhead, underground and the street
Whether lines are overhead or buried affects both cost and street design. Overhead lines are cheaper to build and repair but take space and can be vulnerable to storms and falling trees. Underground systems are less visible and often more weather-resistant, but they cost more and repairs can take longer to locate and dig. Redevelopment is a natural time to consider moving lines, since the street may be reconstructed anyway, which ties back to coordinating street work and to the trench space shared with other utilities.
Transformers on pads and vaults also need room, and so do wide sidewalks and street trees, so tree shade and cooling goals can compete with equipment for the same strip of ground. Sidewalk and building design must make space for them, along with safe access for utility crews. This is a small detail that frequently causes friction in site planning.
Resilience and reliability
Neighborhood redevelopment can improve or complicate reliability. A new, well-designed connection may give a block a more robust supply. But if many new buildings depend on one aging feeder, an outage affects more people. Planners and utilities increasingly discuss how local storage, backup power and flexible loads could help, and how critical facilities such as clinics might be given priority. The practical value of these ideas varies by place and is still evolving.
Climate and weather matter too. Heat waves strain cooling demand and equipment at the same time, and storms test overhead lines. Thinking about resilient infrastructure at the start of a project is generally cheaper than adding it later.
Equity and cost
Grid upgrades cost money, and someone pays. If a utility recovers costs through rates, existing customers share in funding upgrades driven by new growth, which can be fair or unfair depending on how benefits are distributed. If a developer pays directly, those costs may be passed through to rents or prices, a concern for housing affordability. Neither approach is clearly correct, and rules differ widely across jurisdictions.
What residents and officials can ask
A few questions bring useful clarity to a redevelopment proposal:
- Has the utility confirmed it can serve the project, and when?
- What upgrades are needed, and who is paying?
- Will new equipment be located in public space, and how will it look?
- Does the project plan for electric heating and charging, and how is peak demand managed?
- What happens to reliability for existing neighbors during construction and after?
Answers will not always be definite early on, but asking early usually prevents later surprises.