Patrick Francis Cardinal Moran, History of the Catholic Church in Australasia, 1895, pp 122-124:

Till the year 1825, Father Therry was the sole chaplain in New South Wales. Now, however, at the request of the Vicar-Apostolic of London, two Irish priests volunteered for the Australian mission. These were the Rev. Roger Murphy, of the Diocese of Ossory, and the Rev. Daniel Power, of Waterford. The Bishop of Waterford readily granted his consent for Father Power to set out for Australia, but difficulties were thrown in the way of Father Murphy's departure, and he does not appear to have received the necessary permission from his Bishop. Faculties were issued from Propaganda by rescript of 5th November, 1825, for the "Rev. Daniel Power, Irish Priest," to whom was also granted the title of "Missionary-Apostolic" under the jurisdiction of the Right Rev. D. Edward Bede Slater, "Bishop Ruspensis Vicar-Apostolic of the Cape of Good Hope, the Island of Mauritius and New Holland." …

An official letter from Downing Street, dated 4th July, 1826, informed Dr. Poynter, Vicar-Apostolic, of London, that the convict ship "Phoenix" would sail about the 6th of July, and requesting him to notify the same "to the two Roman Catholic clergymen, who are about to proceed to New South Wales." A subsequent official note, dated the 10th of July, intimated that the sailing of the "Phoenix" from London had been deferred, and that it would call "at Kingstown Harbour, near Dublin." It seems not to have been generally known, even at this time, among Father Power's friends that he was proceeding alone to his distant mission. A letter, signed James M. Kirwan, dated "Dublin, Saturday evening, 15th of July, 1826," and addressed to "Rev. Daniel Power, Waterford," states that the "Phoenix" was hourly expected in Dublin, and adds: "I wish most heartily you both would abandon such a forlorn expedition. 'Tis really a dreadful enterprise."

…

A salary of £150 a year was allotted to Father Power, and the following order was published in Sydney on the 3rd of January, 1827:—“His Excellency the Governor is pleased to notify that the Rev. Daniel Power has been appointed Roman Catholic clergyman of this colony in the room of the Rev. John Joseph Therry." Father Power was able to do but little to advance the interests of religion among the suffering convicts. His health appears to have been seriously impaired before his arrival in the colony. During the three years that he survived he was constantly infirm and resided for the most part in Parramatta. On January 15th, 1828, he presented a petition to His Excellency Lieutenant-General Darling , Governor of New South Wales, soliciting aid towards completing the Catholic chapel at Parramatta, on the special ground "that His Excellency resided occasionally in that town." He carried out the instructions received from Dr. Poynter, doing everything in his power to please those in authority. The only favour which was granted him in return was permission by official letter of the 27th October, 1827, for "the Roman Catholics to use the loft above the gaol in Parramatta for the performance of Divine service on Sundays." The official letter takes care to add that "the same apartment would be required at other times for the reception of prisoners passing from one station to another." Father Power died in Parramatta on the 14th of March, 1830.

---

Sydney Gazette and New South Wales Advertiser, 5 January 1827, p 2, http://nla.gov.au/nla.news-article2187287:
Mr. John Joseph Therry, it appears, is at length removed from the rank of Roman Catholic Clergyman, the Reverend Daniel Power having succeeded that Reverend Gentleman in his holy office. From all we have been able to glean, Mr. Power will patiently, and indefatigably, and piously look after his numerous and respectable flock--by which means the Reverend Gentleman will avoid those quicksands and shoals which will otherwise be inevitably destructive. We are heartily glad that our Roman Catholic brethren were supplied with a Minister, prior to Mr. Therry's long anticipated retirement.

---

Died, Sydney Gazette and New South Wales Advertiser, 16 Mar 1830, p 3, http://nla.gov.au/nla.news-article2194697:
On Sunday last, suddenly, at his residence, Sydney, the Rev. Daniel Power, Roman Catholic Chaplain of New South Wales. His health had long been very infirm, but his death was awfully sudden and unexpected.