on Twitter. He said the facility’s electricity prices had increased 100 percent.

He and other hospital directors have appealed to the government in Warsaw to intervene, saying the recent cuts to taxes on energy and gasoline were not enough.

In Germany, there is rising tension in municipally owned utilities that must accept customers, like Mr. Backhaus in Saxony, whose relatively low-cost contracts have been dropped by private energy companies because the companies can’t pay ballooning energy rates.

The municipal utilities are forced to increase the rates for these new customers, often almost astronomically high, to cover the cost of buying extra energy on the spot market at record prices. That leads to tensions in communities, and can threaten municipal finances.

“Anyone who wants to will be supplied with energy by the municipal utilities,” said Markus Lewe, president of the German Association of Cities and Towns. “But it must not lead to the municipal utilities and their loyal customers being asked to pay for questionable business models of other providers and having to answer for their shortsighted financing.”

He called on the federal government to intervene, to protect cities from the price instability.

In France, local leaders are also looking to the federal government to help ease the sting of skyrocketing energy bills.

Boris Ravignon, the mayor of Charleville-Mézières, said his city is facing “a catastrophe” after its January energy bill more than tripled, wiping out the region’s budget surplus for infrastructure and public services in a single month. The city is trying to cut costs by switching streetlights to LED bulbs, which use less electricity, and has proposed a new hydroelectric project.

The mayor has already frozen planned hirings and said the city may have no choice but to raise the cost of public services like water, transportation, fees to use sports halls like the city’s public pool, and cultural events.

“We really want to protect citizens from these increases,” Mr. Ravignon said. “But when prices reach such crazy heights, it’s impossible.”

Reporting contributed by Adèle Cordonnier in France, Raphael Minder in Spain and Niki Kitsantonis in Greece.

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6 Things You Should Know About Traveling to Europe This Summer

By now, most of the large American-run chains have reverted to their pre-Covid cancellation policies for reservations made before a certain date (that has come and gone), and for travel through a certain date (that has come and gone). But some companies are still being flexible: Hilton has always had generous cancellation policies, and Four Seasons has been consistently easy about changes and cancellations during the pandemic.

Travel-industry insiders also have noticed flexibility among independent hoteliers.

“We’ve felt that small, family-run luxury properties are actually more nimble than some of the big hotel chains,” said Louisa Gehring, the owner of Gehring Travel, an affiliate of Brownell, a Virtuoso luxury travel agency. “Rather than lay off all their employees or point to an overarching corporate cancellation policy, they’ve had flexibility to keep the teams on, work with clients on a case-by-case basis and really step up to the plate.”

Policies vary by property, she added, but even some of the more rigid ones now include exceptions for Covid.

One thing to watch for is the credits-versus-refunds flash point: Even in cases when a hotel won’t swallow a deposit or prepayment outright, will you get a cash refund or will you be asked to rebook? Last year, Greece and Italy both passed laws allowing hotels and other travel companies to issue credits, rather than cash refunds, for canceled bookings. Although vaccines, the eagerness to travel and pandemic fatigue may make the idea of a credit less odious than it seemed last spring, always ask about policy specifics, including blackout and expiration dates.

The Palace of Versailles is open and President Emmanuel Macron is sipping espresso outside Parisian cafes, but nightclubs will remain closed even after France’s countrywide curfew ends in June. At restaurants and bars in Madrid, groups are capped at four people inside and six people outside. Germany and the Netherlands remain closed to American tourists.

“Clearly, we will not come back to ‘normal’ straight away, and travelers will have to be conscious of health measures and respect rules at the destination,” said Eduardo Santander, the executive director of the European Travel Commission, a Brussels-based nonprofit that represents the national tourism boards across the continent. “We all — destinations, businesses and guests — cannot let the guard down too soon both for our own health and for the safety of people around.”

In short, any trip to Europe this summer will come down to managing expectations.

“Save the ‘must check all the boxes’ trip to Europe for a bit later, once all new protocol kinks have smoothed out,” Ms. Gehring said. But you may still have an unforgettable experience regardless.

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Traveling to Greece? What to Know About the Reopening

Most Greeks — who have endured months of lockdown — would agree with that sentiment, said Ms. Nakou, the analyst. “I think there is little alternative, to be honest, given the importance of the sector in the economy,” she said.

But Ms. Nakou noted that Covid case numbers rose after the country’s opening to tourists last summer, and that many Greeks associated the arrival of visitors with an increase in the circulation of the virus. She noted that in a survey conducted among Greeks last fall, tourism was the most commonly cited factor in causing the second wave, ahead of people flouting lockdown rules, as well as congestion in public transport or in restaurants.

“I think that is at the back of a lot of people’s minds locally,” said Ms. Nakou. “They’re pleased to see the economy reopening; they’re also quite worried about this.”

In terms of daily new infections, Greece’s worst moment of the pandemic came in early April of this year, when the country was averaging more than 3,000 cases per day; intensive care admissions reached their peak about two weeks later. On a per-capita basis, Greece’s experience pales in comparison to the worst moments of the pandemic in the United States, Britain, France or Italy, but because Greece’s medical system has suffered from years of underfunding, it is particularly vulnerable to strain. The country’s intensive care units were 87 percent full as of April 21, even as lockdown measures were due to be peeled away.

At the same time, vaccination is picking up. Just over 20 percent of the country’s population had received at least one dose of vaccine by the end of April. The coverage is much higher in some of the Greek islands, which were targeted early in the country’s vaccination campaign in part because of their geographical isolation and limited medical facilities. But local leaders also hope that the image of heavily vaccinated, “Covid-free islands” will help to lure tourists back.

“It’s a very important step that guarantees the launch of the tourist season and sends a message of optimism,” Efi Liarou, the mayor of the island Elafonisos, told Agence-France Presse last month.

However many people end up traveling to Greece this summer, it’s clear that this year’s peak tourist season will be unlike any other.

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Europeans Question Return of American Tourists

Spain, though limiting its own citizens’ movements, has for weeks been open to visitors with negative PCR tests from the rest of Europe, and tourists have been flocking to places like Madrid, which has more relaxed restrictions than their home cities. Most of its cultural attractions are open with Covid protocols, and the city’s curfew is 11 p.m., compared to much earlier curfews in other parts of the country and Europe.

Residents there were sanguine about the idea of American visitors. “My neighborhood is already full of unvaccinated French people working remotely, so I think it’s great,” said Naroa Quiros, an interior designer specializing in restaurants, about the decision to open the country up to vaccinated Americans. “Madrid needs it and certainly businesses need it.”

In Turkey, where tourism is the lifeblood of the economy, the European Union’s announcement came just as the country was about to enter a full nationwide lockdown to curb a surge in coronavirus infections and deaths, which have reached record levels. The Turkish Health Ministry recorded 37,312 new Covid-19 infections and 353 deaths over a 24-hour period on Monday.

Under the new measures, Turkish residents will be required to mostly stay at home except for grocery shopping trips and urgent medical treatment. All restaurants, cafes, bars and nonessential shops will be closed. As they have been through much of the pandemic, tourists will be exempted from the restrictions.

“At a time when Europe is entering a phase of reopening, we need to rapidly cut our case numbers to below 5,000 not to be left behind,” President Recep Tayyip Erdogan said on Monday. “Otherwise we will inevitably face heavy costs in every area, from tourism to trade and education.”

There were, of course, practical questions about what kind of “vaccine passports” might be developed and concerns about whether amid a slow vaccine rollout in France, for instance, even vaccinated Americans could impact the evolution of the outbreak.

Michele Gargiulo, 40, who co-owns and runs LibrOsteria, a bookshop cafe in Milan that was a tourist attraction before the pandemic, said that though he is concerned about safety, he believes that “it could be tourists just like it could be anything else.”

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