BOSTON — The state is on track to meet its ambitious goals for reducing greenhouse gas emissions by 2020, Gov. Charlie Baker’s administration said Tuesday while cautioning that success may hinge on legislative approval of a plan to import more Canadian hydropower.

The Global Warming Solutions Act of 2008, signed by then-Gov. Deval Patrick, a Democrat, established a benchmark of reducing carbon emissions that contribute to climate change by 25 percent from 1990 levels. The law sets a further goal of cutting emissions 80 percent by 2050.

In a report to lawmakers updating compliance with the law, the state’s secretary of energy and environmental affairs, Matthew Beaton, said the 25 percent goal by 2020 was “attainable” and if recommendations contained in the report were fully implemented the state would be on course for “environmentally responsible economic growth for decades to come.”

Baker, a Republican, last year filed a bill aimed at increasing the state’s reliance on renewable energy sources, with a focus on hydroelectricity. The measure would require utilities to work with state officials in pursuing long-term contracts for importing Canadian hydro, though transmission routes haven’t been determined.

The administration said boosting hydropower would account for 4 percent of the 25 percent reduction target.

“While progress to reduce greenhouse gas emissions has been made on many fronts, the (report) highlights the need for immediate action on our legislation for clean and affordable hydroelectricity and other renewable resources in order to achieve our 2020 goals and position us to meet the long-term reduction targets,” Baker said in a statement accompanying Tuesday’s report.

Officials also highlighted the need to continue implementing emission standards for new vehicles as critical to meeting the goals for reducing the states’ carbon footprint.

By 2012, the last year in which statistics were available, the state had reduced its greenhouse gas output since 1990 from 94.5 million metric tons of carbon dioxide equivalent to 72.1 million. But the report warned that under a “business as usual” approach, emissions could quickly spike back to 92.7 million metric tons by 2020, well above the 70.8 million figure needed to meet the state goal.

The biggest percentage drop came in the area of electricity consumption, which accounted for nearly 30 percent of the state’s greenhouse gas emissions in 1990 but just below 22 percent in 2012. The recent closings of several coal-burning power plants and more energy efficient construction were cited as key factors in the drop.

Some environmental activists have been skeptical of the state’s ability to meet the benchmarks under the law.

The Environmental League of Massachusetts, in a 2014 report, forecast the state would achieve only a 20 percent reduction in greenhouse gas emissions by 2020 without more aggressive steps to shift reliance to renewable energy sources and dramatically increase the number of people who walk, bike or use public transit rather than drive.

The Conservation Law Foundation, along with several Boston-area teenagers, last year filed a lawsuit arguing state agencies had failed to create regulations needed to reach the goals set by the law.