Exhibit 99.1

ATLANTICA SUSTAINABLE INFRASTRUCTURE PLC

Annual General Meeting of Shareholders

May 4, 2021

Final Report of the Inspector of Election

I, the undersigned, the duly appointed Inspector of Election at the Annual General Meeting of Shareholders (the “Meeting”) of Atlantica Sustainable Infrastructure plc (the “Company”), on May 4, 2021 hereby certify that:

Before entering upon the discharge of my duties as Inspector of Election at the Meeting, I took and signed an Oath of Inspector of Election.

The Meeting took place at Bay Adelaide Centre, 333 Bay Street, Suite 810, Toronto, Ontario, Canada, M5H 2R2, with satellite meeting places at Great West House, GW1, 17th floor, Great West Rd, Brentford TW8 9DF, United Kingdom and c/ Francisco Silvela 42, 4 floor 28028 Madrid, Spain, pursuant to notice duly given.

As of April 30, 2021, the record date for the determination of shareholders entitled to vote at the Meeting, there were 110,797,738 shares of the Company’s Common Stock, each share being entitled to one vote, constituting all of the outstanding voting securities of the Company.

At the Meeting, the holders of 82,615,064 shares of the Company’s Common Stock were voted, with at least two members represented in person, constituting a quorum.

The undersigned canvassed the votes of the shareholders cast by ballot or proxy on the matters presented at the Meeting.

At the Meeting, the vote on a resolution to receive the accounts and reports of the directors and auditors for the year ended 31 December 2020, was as follows:

FOR		AGAINST		VOTE WITHHELD
82,543,632		22,365		49,067

At the Meeting, the vote to approve the directors' remuneration report, excluding the directors' remuneration policy, for the year ended 31 December 2020, was as follows:

FOR		AGAINST		VOTE WITHHELD
79,763,404		2,758,584		93,076

At the Meeting, the vote to approve the directors' remuneration policy was as follows:

FOR		AGAINST		VOTE WITHHELD
79,679,548		2,802,551		132,965

At the Meeting, the vote to elect Michael Woolcombe as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,487,205		58,894		68,965

10)

At the Meeting, the vote to elect Michael Forsayeth as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,433,939		111,606		69,519

11)

At the Meeting, the vote to elect William Aziz as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,427,385		113,738		73,941

12)

At the Meeting, the vote to elect Brenda Eprile as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,464,087		87,583		63,394

13)

At the Meeting, the vote to elect Debora Del Favero as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,405,990		146,568		62,506

14)

At the Meeting, the vote to elect Arun Banskota as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,125,778		418,609		70,677

15)

At the Meeting, the vote to elect George Trisic as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,181,398		359,967		73,699

16)

At the Meeting, the vote to re-elect Santiago Seage as director was as follows:

FOR		AGAINST		VOTE WITHHELD
82,194,768		348,535		71,761

17)

At the Meeting, the vote regarding the re-appointment of Ernst & Young LLP and Ernst & Young S.L. to hold office until 31 December 2022, was as follows:

FOR		AGAINST		VOTE WITHHELD
82,523,846		45,685		45,533

18)

At the Meeting, the vote to authorize the Company’s audit committee to determine the remuneration of the auditors was as follows:

FOR		AGAINST		VOTE WITHHELD
82,482,817		72,939		59,308

19)

At the Meeting, the vote to authorize the board of directors to issue shares was as follows:

FOR		AGAINST		VOTE WITHHELD
80,982,684		1,548,692		83,688

20)

At the Meeting, the vote to authorize the board of directors to issue equity securities without pre-emptive rights up to approximately a 10% of the aggregate nominal value of the issued share capital of the Company was as follows:

FOR		AGAINST		VOTE WITHHELD
82,232,958		183,667		198,439

21)

At the Meeting, the vote to authorize the disapplication of pre-emptive rights up to an additional amount of approximately a 10% of the aggregate nominal value of the issued share capital of the Company, was as follows:

FOR		AGAINST		VOTE WITHHELD
66,031,293		16,382,984		200,787

22)

At the Meeting, the vote to authorize the redemption of the share premium account, was as follows:

FOR		AGAINST		VOTE WITHHELD
82,328,257		136,286		150,521

IN WITNESS WHEREOF, I have made this Final Report and have been hereunto set my hand this 4^th day of May 2021.

Inspector of Election

/s/ Anthony P. Carideo
Anthony P. Carideo