Electricity generating stations across three rebel-held Yemeni provinces were hit in Saudi-led airstrikes on Monday, local residents said.
The strikes come a day after the official Saudi Press Agency reported that an electricity transformation station in a southern Saudi city was hit and set on fire by a missile fired from inside Yemen.
Monday's strikes hit four generating stations in the rebel stronghold of Saada province in the far north of Yemen, as well as rebel positions in the area, local residents said.
Electricity and gas stations were also reported hit in Amran province and in Abs district, where 19 people were killed earlier this month in an airstrike on a hospital run by international medical charity Doctors without Borders (MSF).
The hospital strike led the charity to pull out of Yemen, citing "indiscriminate bombings" and "unreliable assurances" by the coalition.
The UN's human rights chief on Thursday called for an international investigation into civilian deaths in the Yemen conflict, which pits a weak Saudi-backed government against the Houthi rebels and elite army units loyal to former president Ali Abdullah Saleh.
Saudi-led airstrikes killed 1,259 out of 2,067 civilian victims between July 2015 and June 2016, according to UN rights chief Zeid Ra'ad Al Hussein.
The US - which has reportedly backed the Saudi-led coalition with targeting advice as well as flying over 1,000 refuelling missions - defended Riyadh after Zeid's call for an investigation.
US Secretary of State John Kerry on Thursday said that the kingdom was committed to investigating what he described as "troubling reports" of civilian casualties.
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