Methane is 80 times as potent at trapping heat from solar radiation as carbon dioxide over its first 20 years in the atmosphere. It is responsible for about half a degree Celsius of global warming since the preindustrial era, and its levels are rising fast, according to measurements made by the National Oceanic and Atmospheric Administration. 

The planned rules affect hundreds of thousands of U.S. wells, storage tanks and natural-gas processing plants, and require companies to replace leaky, older equipment and buy new monitoring tools.

EPA Administrator

Michael Regan

said flaring—a technique used by gas producers to burn off excess methane from oil and natural-gas wells—would be reduced at all well sites under the planned rules. Owners would be required to monitor abandoned wells for methane emissions and plug any leaks, he said.

“We’ve tightened down to limit flaring as much as possible without banning it,” Mr. Regan said.

The American Petroleum Institute, which represents U.S. oil and gas producers, said it was reviewing the proposed rule. 

“Federal regulation of methane crafted to build on industry’s progress can help accelerate emissions reductions while developing reliable American energy,”

Frank Macchiarola,

API’s senior vice president of policy, economics and regulatory affairs, said in a statement.

Lee Fuller of the Independent Petroleum Association of America, a Washington, D.C., trade group that represents many smaller producers, said his group would be reviewing the regulations closely. 

“While everyone wants to produce oil and natural gas using sound environmental procedures, there will always be a need to assure that the regulatory structure is cost effective and technologically feasible,” he said in a statement. 

Rachel Cleetus, lead economist for the Union of Concerned Scientists, a nonprofit advocacy group, said in a statement that the EPA had “taken an important step forward by issuing a robust standard for methane emissions from oil-and-gas operations.”

Mr. Biden is walking a political tightrope during his brief stopover in Egypt on his way to summits in Cambodia and Indonesia. The war in Ukraine has unleashed turmoil in energy markets, underscoring the world’s continued reliance on fossil fuels.

Control of the U.S. Senate and House of Representatives still hinged on races that were too close to call as of early Friday morning, with both parties girding for a final outcome that might not be known for days. If Republicans win control of either chamber it would mean more power to a party that is deeply skeptical of Mr. Biden’s climate agenda and reluctant to spend billions of dollars to help other countries transition to cleaner sources of energy.

The White House said Mr. Biden is expected to announce an additional $100 million for the United Nations Adaptation Fund, which helps countries adapt to floods, droughts and storms that climate scientists say are increasing in frequency and severity as the earth’s atmosphere and oceans warm. The U.S. has yet to pay the $50 million it pledged to the fund at last year’s climate talks in Glasgow.

The U.S. also owes $2 billion to the U.N. Green Climate Fund, which finances renewable energy and climate adaptation projects in the developing world. The administration has asked for $1.6 billion for the fund in the fiscal 2023 budget.

The White House said Mr. Biden would also pledge $150 million to a U.S. fund for climate adaptation and resilience across Africa; $13.6 million to the World Meteorological Organization to collect additional weather, water and climate observation across Africa; and $15 million to support the deployment of early-warning systems in Africa by NOAA in conjunction with local weather-forecasting agencies.

The U.S. pledges don’t address demands from poorer nations to provide money for damage they say is the result of climate-related weather events—a new category of funding known as “loss and damage.” This week at the summit, Belgium and Germany pledged a combined 172 million euros, equivalent to $176 million, to support loss-and-damage payments to developing countries. Scotland pledged $5.8 million and Ireland pledged $10 million.

Developing countries have made a renewed push to set up a mechanism for loss-and-damage payments after severe floods in Pakistan this summer that caused $30 billion in losses, according to World Bank estimates, killed more than 1,700 people and displaced 33 million residents. Sen.

Sherry Rehman,

Pakistan’s federal minister for climate change, said she is hoping for more resources from the U.S. and other nations to help her country.

U.S. negotiators are concerned the concept of loss and damage exposes wealthier nations to spiraling liability. There is also the scientific uncertainty of determining which effects can be tied to human-induced climate change and which are part of normal seasonal variation. However, U.S. climate envoy

John Kerry

said this week at the conference that he is open to discussing loss and damage.

“We need more,” Ms. Rehman said in an interview. “What you hear everywhere at COP is ‘action now.’ Everything else is fluff.”

Mr. Biden arrived at the climate summit Friday after most world leaders have departed. He met privately with Egyptian President

Abdel Fattah Al Sisi

at the conference, located at a resort town along the Red Sea. The U.S. and Germany were expected to announce Friday a $250 million financing program to build 10 gigawatts of new wind-and-solar energy facilities in Egypt while decommissioning 5 gigawatts of inefficient natural-gas power plants.

The Biden administration’s efforts to curb methane emissions follow an agreement reached on the sidelines of the Glasgow summit a year ago, in which China and the U.S. pledged to work on reducing emissions of the gas. Beijing this week announced a plan to cut methane emissions but hasn’t yet included the new measures in its climate plans submitted to the U.N. 

Nigeria announced its first-ever regulations, including limits on flaring, to cut overall methane emissions by more than 60% over 2020 levels. Canada said Thursday it plans to cut emissions of methane from its oil-and-gas industry by more than 75% over 2012 levels by 2030. 

Emissions from flaring are far higher than previous government and industry estimates, according to an analysis of 300 wells in four states published in September in the journal Science.

The White House says 260 billion cubic meters of gas are wasted every year from flaring and methane emissions within the oil-and-gas sector. 

Under the 2015 Paris climate agreement, countries aim to limit global warming to well under 2 degrees Celsius above preindustrial levels and preferably to 1.5 degrees. The gap between the emissions cuts pledged by 166 nations, including the U.S., and their current emissions puts the world on track to warm 2.5 degrees Celsius, or 4.5 degrees Fahrenheit, by the end of the century, according to a recent U.N. report.

White House officials point to Mr. Biden’s support of the Democrats’ climate, health and tax legislation that allocates hundreds of billions of dollars to climate and energy programs, including tax credits for buying electric vehicles and investments in clean technologies.

Administration officials said the legislation has helped put the U.S. on track to meeting Mr. Biden’s goal of cutting domestic emissions 50% below 2005 levels by 2030.

—Matthew Dalton and Scott Patterson contributed to this article.

Write to Eric Niiler at eric.niiler@wsj.com