 
Senate elections were held in Thailand from 9 to 26 June 2024, the first of its kind under the 2017 Constitution. Under the Constitution, the transitional Senate of Thailand expired on 10 May 2024. Afterwards, the following Senates will be a 200-member body and have no power to elect Prime Ministers. 
This was the first election to utilize the highly complex electoral system envisioned by the 2018 Organic Act on the Acquisition of Senators. Its members will be elected among the independent candidates, without participation from outside the candidate pool. The elections were already criticized for the complexity, secrecy and confusion of the voting system.
Background.
The Thai Senate has undergone several reformations since it was originally established in 1947. On various occasions, the Senate has been appointed, directly elected, indirectly elected, or some combination of these. Under the present 2017 Constitution, which was promulgated in the aftermath of the 2014 Thai coup d'état, provided for a 5-year transitional Senate appointed by the National Council for Peace and Order, the military junta that governed Thailand from the coup in 2014 until 2019, followed by "permanent" Senates.
The transitional Senate is composed of 250 members handpicked by the junta. It had the power to vote for Prime Minister, alongside members of the House of Representatives. It voted overwhelmingly for Prayut Chan-o-cha in 2019 and Srettha Thavisin in 2023. This provision came under intense public scrutiny during the 2023 Prime Ministerial election, when Senators refused to back the election of Pita Limjaroenrat, despite a large majority of the House supporting his candidacy. 
After the transitional Senate expires on 10 May 2024, the following Senates are indirectly elected via a highly complex election system, intended to produce a technocratic institution. The 2024 elections will be the first to use this system. The permanent Senate will not have the power to vote for Prime Minister.
2023 elections.
The government of Prayut Chan-o-cha was defeated in a landslide in the 2023 House of Representatives elections. The Move Forward Party won the most seats, with Pheu Thai Party in second place. An attempt to form a coalition government between the two parties failed, after Move Forward leader Pita Limjaroenrat failed to be elected prime minister, largely because of opposition from the conservative Senate.
Instead, the government was formed by Pheu Thai's Srettha Thavisin. The Srettha Cabinet is supported by the conservative Bhumjaithai Party and Chart Thai Pattana Party, as well as Prayut-aligned parties such as Palang Pracharath Party and United Thai Nation Party.
Electoral system.
The permanent Senate of Thailand is composed of 200 senators, chosen by and among "persons having the knowledge, expertise, experience, profession, or characteristics or common interests or working or having worked in varied areas of the society". It is a non-partisan body, and all candidates will run as independents. Senators serve five-year terms and are ineligible for re-election thereafter. The rules for the election are laid down in the 2018 Organic Act on the Acquisition of Senators.
Candidates must be Thai nationals by birth, at least 40 years old, and have a minimum of 10 years experience in their field. The 20 groups include:
They must have some connection to the district they seek to contest in. They must also pay a 2,500 baht application fee. Candidates cannot be members of a political party. Also prohibited from contesting are civil servants, current and former member of parliaments, former government ministers, former local administrators, former political party executives (unless they have been out of their post for at least five years), parents, spouses and children of senatorial candidates. Members of the transitional Senate cannot run.
Senators are elected among applicant candidates pool, without any participation from non-candidates. Each candidate applies to represent one of 20 eligible groups, and ten senators will be elected from each group. There are six rounds of voting, two each at the district, provincial, and national level. Notably, the public cannot observe the voting process, except the candidates themselves.
Timeline.
At the district level, the candidates will vote within their group. In each district, the five candidates in each group with the most votes will advance to the second round. In the second round, each candidate will be assigned 3–5 random groups (other than their own), and vote for the candidates in those groups. The top three candidates in each group in each district will then advance, for a total of 60 candidates in each district.
The provincial level process will occur on 16 June. Because the number of districts in each province varies (anywhere between three and 50), the number of candidates in each province will vary significantly. Candidates will first narrow the number of candidates in their group to 5. They will then again vote for candidates in other groups. They may or may not be assigned the same groups to vote in at the provincial level than at the district level. There will now be 2 candidates in each group in each province, for a total of 3,080 remaining candidates nationwide.
The process will then move on to the national level, where the remaining 3,080 candidates will repeat the intra and inter-group voting to elect 10 senators from each of the 20 groups.
The number of candidates each voter is allowed to vote for varies depending on the round. The system lends itself to limited voting. At the district and provincial level, each voter will have two votes within their group, and one vote for the inter-group election. At the national level, a voter may have ten votes for the intra-group election, and five for the inter-group election. The candidates with the most votes will proceed, and all others will be eliminated. There is no minimum threshold of votes required to be elected. Candidates may vote for themselves in the intra-group elections. A voter may not cast more than one vote for a single candidate. A voter does not need to use all of their votes.
Criticism.
The electoral system is controversial. Critics have referred to it as "the most complicated election in the world".
Other criticism centers on the system's alleged vulnerability to manipulation. Because any eligible person can run, district-level elections can be packed in order to ensure the election of particular candidates. The 2018 election for the transitional Senate utilized a similar system, although most senators were ultimately selected by the junta. Candidates who participated in the process alleged vote buying, saying that desired candidates utilized their professional connections to be elected.
Results.
The Election Commission published the list of elected senators in the Royal Gazette and subsequently inaugurated them on 10 July. 
Voting camps.
On 23 July 2024, the newly elected Senators gathered to elect the President. The results were 153 for the so-called "Blue Senators," who were alleged to be affiliated with Bhumjaithai Party, 19 for the so-called "New Breed Senators" who vowed to promote liberal and progressive causes (despite 30 pledged into this camp beforehand), and 13 for the unaffiliated of the two aforementioned camps. This included invalid and blank votes.
References.
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