San Diego Gas & Electric has arranged to buy systems for converting part of its truck fleet into plug-in hybrid vehicles.

Under a memorandum of understanding with Boston-based XL Hybrids, SDG&E will pay to turn up to 110 commercially available, gasoline-powered trucks to hybrids between 2017 and 2020, SDG&E announced Dec. 14.

The initiative is the latest effort by the utility to reduce emissions and adopt more environmentally sustainable practices.

SDG&E said it plans to convert more than a fifth of its fleet to alternative-fueled vehicles by 2020. Toward that end, it recently bought more than 30 new plug-in hybrid trucks expected to eliminate more than 453 tons of greenhouse gas emissions, which the company said is the equivalent of taking nearly 100 cars off the road for one year.

The company was California’s first investor-owned utility to achieve the state mandate of procuring one-third of its power from renewable energy sources by 2020.

SDG&E is owned by Sempra Energy, a Fortune 500 energy services holding company based in San Diego.