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Electricity 101: How the Arizona grid works

Animation of power moving from power plants, solar panels and wind turbines into transformers and power lines to provide energy to homes and businesses

How the Arizona grid fits in and how SRP is modernizing our infrastructure for residents and businesses 

Recent power grid failure events in the U.S. have Arizona residents wondering if we are at risk of facing similar challenges. Up until recently, it probably wasn’t top-of-mind to think about your state’s power grid and whether your power provider has plans in place for catastrophic events. Much like the air we breathe, power is just supposed to be there every time you flip a switch or plug something in. 

But in reality, the electrical grid is a highly complex system made up of power generating stations, transmission lines, substations, transformers, power lines and infrastructure that deliver electricity to homes, businesses and industries.  Providing reliable power for current customers while expanding the grid and keeping power low-cost and reliable is a delicate balance to strike, but one we’re committed to. 

How Arizona fits into the power grid

Interestingly, the U.S. has three major grids:

  1. The Western Interconnection
  2. The Eastern Interconnection
  3. The Electric Reliability Council of Texas

Arizona belongs to the Western Interconnection, which serves over 80 million people, spans more than 1.8 million square miles and includes approximately 136,000 miles of transmission lines. It connects 14 U.S. states, the Canadian provinces of British Columbia and Alberta, and the northern portion of Baja California in Mexico.

How the electric grid works

The combined U.S. grid is the largest interconnected machine on the planet, but getting electricity into your home can be broken down into three key steps:


Electricity starts at a generator, which can be powered by burning fossil fuels, running wind turbines, capturing the sun’s energy via solar panels, collecting water energy in hydroelectric dams or harnessing it from nuclear reactors.


After power is generated, it moves into a transmission substation that uses a transformer to “step up” (or increase) the power to extremely high voltages for transmission across long distances. Those very large power lines you see are transmission lines. This power is then stepped down (or decreased) at a transformer in a substation closer to your home.


From the substation, electricity travels through wires, either through overhead or underground lines, before being stepped down again via a small transformer attached to the pole or on the ground. If your lines are underground, you or one of your neighbors might even have one of these little transformers in your yard.

From there, you can use this power to light your home, prepare your meals, keep yourself cool during those hot Arizona days, binge-watch your favorite shows and maybe even power your electric car.

Evolution of the grid

As you might expect, the same grid that was designed to simply keep the lights on in the early to mid-1900s isn’t optimal for today’s growing energy needs. That’s why SRP and other utilities around the country are continuously working to modernize the grid to meet our changing needs.

Today’s enhanced, more efficient grid features two-way communication technology that enables you to do things like check your energy use on a daily basis through My Account or the SRP Power mobile app and receive eNote alerts and reminders for outages, bill projections and more.

It also operates more reliably and efficiently, allowing SRP to plan and anticipate energy demand to avoid drops in power quality and speed power restoration after an outage. It improves the ability to serve future economic development and lets us integrate more renewable energy into the mix (including excess energy generated by our customers who have solar panels installed on their roofs).

Powering the future

Learn more about how SRP is preparing for the Valley’s future energy needs, and learn more about our 2035 Sustainability Goals.

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