By Anna Flávia Rochas and Roberto Samora

SAO PAULO, Jan 9 (Reuters) - Southeastern Brazil is getting some rainfall a year after a record drought started, but not enough to eliminate worries about an energy crisis, water shortages or another season of damaged export crops, meteorologists said.

Record-high temperatures and the most severe drought in at least 80 years punished southeastern Brazil last year, a region accounting for 60 percent of the country's gross domestic product. Despite rain in recent weeks, the country's climate challenges could threaten a tepid economic recovery.

Private weather forecaster Somar warned of irregular rainfall in the center-west soy belt as well as the southeast throughout the month as an atmospheric blockage prevents a cold front from advancing over key crop regions in the world's largest exporter of coffee, sugar, soy and beef.

That is especially worrisome in the southeastern state of Minas Gerais, which produces half of Brazil's coffee. Drought there last year wiped out as much as a third of the crop in some areas, causing global arabica prices to rise 50 percent over the year even as most other commodity markets tumbled.

Scientists said coffee trees would not recover from the extreme heat and drought quickly, and forecasts pointing to below-average rain this month triggered another arabica price rally this week.

Somar agro meteorologist Marco Antonio dos Santos expressed concern about the 2015 coffee crop, which will be harvested between May and August.

"It's not like 2014, when the whole crop was affected, but I am sure there will be regional damage," he said. "Some red flags are going up."

The Reuters weather dashboard on Friday showed that by Jan. 23, rainfall would be about half the historical average in the southeast region and 300 mm (11.8 inches) behind in Minas Gerais.

POTENTIAL WATER SHORTAGE

Rains are not likely to bring reservoirs back to comfortable levels in southeastern Brazil, which is responsible for 70 percent of the country's hydroelectric generation. Brazil, which has the world's largest fresh water supply, usually relies on hydro-power to generate some 75 percent of its energy needs, although that rate has fallen over the past year.

"Even with normal or above-average rains, it won't be enough to reverse the current scenario," Somar meteorologist Willians Bini said.

Reservoir levels in the southeast fell to 19.72 percent capacity this week. The national grid operator said they would probably rise to 29.8 percent by the end of January, still below 41 percent a year ago and well short of the 60 percent level specialists consider ideal ahead of the dry season.

Even so, the government has ruled out electricity rationing as power distributors turn to expensive alternatives like thermal. The president of the CCEE spot market electricity clearinghouse said last month that he expected thermal plants in the southeast to remain active for two more years.

Rising energy prices have increased costs for electrical distributors and the government is in the process of approving a nearly $1 billion loan from state-run banks to help companies cover costs. It would be the third such loan in less than a year.

Climatempo meteorologist Alexandre Nascimento said potable water shortages in 2015 are possible for the 20 million people of Sao Paulo, South America's largest city,

"In the best hypothesis," he said, "we will be able to recover the dead volumes," which are the muddy reserves at the bottom of the city's main reservoir that state-run utility Sabesp has relied on for months to keep taps running.

Sabesp received authorization this week to implement steep fines for above-average water use, but some fear the measure came too late. The Cantareira reservoir was at 6.8 percent capacity as of Thursday, even after several afternoons of violent summer rainstorms in Sao Paulo. (Writing by Caroline Stauffer; Editing by Todd Benson and Lisa Von Ahn)