Our Carbon Footprint


We have voluntarily reported to the Carbon Disclosure Project (CDP) since 2008.  Our total carbon footprint fluctuates significantly on an annual basis.  This is due to many factors, including our aggressive utility acquisition strategy, our continued transition towards renewable energy projects in our power generation portfolio, and organic changes in operational practices at our thermal generation facilities. 

We also provide benchmarks that reflect GHG emissions within the context of our growing asset base and revenues.  Our intensity-based GHG emissions (per $ revenue) have decreased steadily over the past three years.

2013 absolute and intensity-based GHG emissions were reported as:

Scope 1 metric tonnes CO2e = 310456

Scope 2 metric tonnes CO2e = 32984






Absolute CO2e Emissions




Intensity-based to Revenue





We consistently review reporting protocols to confirm alignment with GHG reporting best practices. Our GHG management efforts follow the ISO 14064-1 standard and “The Greenhouse Gas Protocol: A Corporate Accounting and Reporting Standard” developed by the World Resources Institute and the World Business Council for Sustainable Development.

Solar Rooftops for our Buildings

In 2012, our regulated utility distribution group installed solar panels on some of the water reservoir rooftops in Arizona. The benefits are positive: lower utility costs, reduced electric load on the local grid, positive customer response, and a reduction to our overall carbon footprint. We plan to expand the solar rooftops program to include more company-owned facilities.

Fleet Conversions to Compressed Natural Gas and Electric Power


Our fleet operations represent a major sustainability opportunity for our business. By converting to lower or zero emissions vehicles, we reduce environmental and financial costs associated with transportation.

We have a fleet of 550 heavy and light duty vehicles, and a growing infrastructure of customer service locations across many states. Vehicle testing is underway to convert to both natural gas and electric power. We pilot tested several vehicle types, from 100% electric to dual fuel, in both passenger vehicles and light duty trucks.

Preferred Parking for Low Carbon Customers

Some of our customer service locations provide preferred parking status to visitors arriving in hybrid vehicles. We will continue to report on our expanded fleet conversions, as well as refuelling and electric recharging infrastructure and the resulting cost and carbon reductions from our fleet.