OPINION BY
Judge SIMPSON.
This appeal from the modification of workers’ compensation benefits again raises the question of an employer’s responsibility to prove whether or not it has a position available to a partially disabled claimant. We determine that the fact-finder failed to address a crucial conflict in [246]*246evidence on this issue. Accordingly, we vacate and remand.
Colleen Rosenberg (Claimant) was employed by Pike County (Employer) as a corrections officer when, in January 2002, she suffered an injury to her right knee from which she has not recovered. However, she returned to light duty work with Employer for about 10 months in a clerical position with the Board of Elections.
In December, 2002, the County Commissioners sent a letter to Claimant terminating her clerical employment with the Board of Elections. The letter stated in part:
It has come to the Commissioners’ attention that the functional capacity evaluation performed on you indicates that there is no reasonable prospect that you can return to full time duty at the Pike County Correctional Facility, and since the County has no provision for a permanent light duty position, the Commissioners find it necessary to terminate your light duty employment effective January 17, 2003.
Certified Record, Dep. of Charles Grande, 10/15/03, at Ex. 1. According to Claimant, and significant to our disposition, she was replaced in the Board of Elections clerical position by a newly-hired person. Reproduced Record (R.R.) at 52a-53a, 65a, 68a.
After the Board of Elections clerical employment ended, Claimant looked for work elsewhere. She found part-time work with varied hours as a dispatcher between January and March, 2004. R.R. at 71a-76a. She also found employment as a bank teller working 24 hours over four days a week beginning in March, 2004. R.R. at 77a-79a.
Regarding Claimant’s medical condition, arthroscopic surgery was performed in June, 2002. In 2002 and 2003, Claimant was evaluated by an orthopedic surgeon on behalf of Employer. He opined that she was capable of work in a light duty to medium duty capacity. He also concluded that Claimant could not return to her original corrections officer position. These opinions are not challenged. Claimant received a notice of ability to return to work in November, 2002.
As a result of the orthopedic evaluation, Charles Grande, a certified rehabilitation counselor (Rehabilitation Counselor), evaluated Claimant on behalf of Employer. He met with Claimant, took a vocational background of her, and conducted a labor market survey.
In July, 2003, Employer filed a petition for modification as of March, 2003, based on the results of Rehabilitation Counselor’s labor market survey. Hearings before a Workers’ Compensation Judge (WCJ) followed.
At the hearings, Employer presented deposition testimony from its orthopedic surgeon and from Rehabilitation Counsel- or. Thereafter, Claimant testified, but she did not present other witnesses. The WCJ accepted the testimony of Employer’s witnesses and partially accepted Claimant’s testimony. In particular, the WCJ found that there were three positions available to Claimant which she was capable of performing, and he imputed the income of one of the jobs to her, resulting in a reduced compensation rate.1 In sum, the WCJ granted the modification petition.
Claimant appealed, raising various issues, including the failure of the WCJ to make a finding regarding available employment with Employer. Noting that Rehabilitation Counselor’s accepted testimony included his acknowledgment that he was not aware whether additional light [247]*247duty employment with Employer was available, the Workers’ Compensation Appeal Board (Board) vacated and remanded. Bd. Op., 9/7/05, at 3-4; R.R. at 99a-100a. The Board directed that additional findings and conclusions be made as to whether Employer met its burden under Section 306(b)(2) of the Pennsylvania Workers’ Compensation Act (Act), 77 P.S. § 512(2).2 Id.
On remand to the same WCJ, no further hearings were held. The WCJ entered a new decision that contained an extensive finding responsive to the Board’s instructions.3 Essentially, the WCJ relied on an [249]*249exhibit which was introduced during Rehabilitation Counselor’s deposition testimony. The exhibit was the termination letter sent to Claimant and quoted earlier in this opinion.
The WCJ relied upon Burrell v. Workers’ Compensation Appeal Board (Philadelphia Gas Works & Compservices, Inc.), 849 A.2d 1282 (Pa.Cmwlth.2004), for the proposition that an employer need not prove the absence of specific jobs with an employer as a prerequisite to expert testimony of earning power. Based on the Claimant’s 10-month light duty clerical position at the Board of Elections and language in the termination letter that “[Employer] has no provision for a permanent light duty position,” Dep. of Charles Grande at Ex. 1, the WCJ determined Employer could prove its case by expert testimony of earning power. Accordingly, the WCJ again granted modification.
On Claimant’s appeal, the Board affirmed. It agreed with the application of Burrell. Also, it determined the finding that Employer did not have permanent light duty positions available to Claimant was supported in the record by the termination letter.
Claimant appeals to this Court, and she advances two assignments of error.4 First, she contends the compensation authorities committed an error of law in concluding Employer was not required to prove it had no positions available within Claimant’s abilities during the relevant period. Second, she argues that the termination letter, upon which the fact-finder relied in finding no permanent light duty positions available, was incompetent hearsay. Consequently, Claimant contends Employer could not prevail in a modification petition under Section 306(b)(2) of the Act.
As to the first issue, Claimant briefly argues that reliance on Burrell is misplaced. She contends that case was limited to its facts, which involved a modification based on surveillance and not, as here, on medical testimony and a labor market survey. Rather, this case is controlled by South Hills Health System v. Workers’ Compensation Appeal Board (Kiefer), 806 A.2d 962 (Pa.Cmwlth.2002), which holds that Section 306(b)(2) of the Act and Section 123.301 of the regulations5 require an [250]*250employer seeking modification based on a labor market survey to show lack of in-house positions within a specific time frame.
In Burrell, this Court affirmed a modification of benefits based on surveillance showing the claimant working at a new job and on an expert’s opinion as to the pay rates for the work he was performing. Rejecting the claimant’s argument that the employer was required to first prove that it had no positions available, this Court, speaking through your current author, stated:
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OPINION BY
Judge SIMPSON.
This appeal from the modification of workers’ compensation benefits again raises the question of an employer’s responsibility to prove whether or not it has a position available to a partially disabled claimant. We determine that the fact-finder failed to address a crucial conflict in [246]*246evidence on this issue. Accordingly, we vacate and remand.
Colleen Rosenberg (Claimant) was employed by Pike County (Employer) as a corrections officer when, in January 2002, she suffered an injury to her right knee from which she has not recovered. However, she returned to light duty work with Employer for about 10 months in a clerical position with the Board of Elections.
In December, 2002, the County Commissioners sent a letter to Claimant terminating her clerical employment with the Board of Elections. The letter stated in part:
It has come to the Commissioners’ attention that the functional capacity evaluation performed on you indicates that there is no reasonable prospect that you can return to full time duty at the Pike County Correctional Facility, and since the County has no provision for a permanent light duty position, the Commissioners find it necessary to terminate your light duty employment effective January 17, 2003.
Certified Record, Dep. of Charles Grande, 10/15/03, at Ex. 1. According to Claimant, and significant to our disposition, she was replaced in the Board of Elections clerical position by a newly-hired person. Reproduced Record (R.R.) at 52a-53a, 65a, 68a.
After the Board of Elections clerical employment ended, Claimant looked for work elsewhere. She found part-time work with varied hours as a dispatcher between January and March, 2004. R.R. at 71a-76a. She also found employment as a bank teller working 24 hours over four days a week beginning in March, 2004. R.R. at 77a-79a.
Regarding Claimant’s medical condition, arthroscopic surgery was performed in June, 2002. In 2002 and 2003, Claimant was evaluated by an orthopedic surgeon on behalf of Employer. He opined that she was capable of work in a light duty to medium duty capacity. He also concluded that Claimant could not return to her original corrections officer position. These opinions are not challenged. Claimant received a notice of ability to return to work in November, 2002.
As a result of the orthopedic evaluation, Charles Grande, a certified rehabilitation counselor (Rehabilitation Counselor), evaluated Claimant on behalf of Employer. He met with Claimant, took a vocational background of her, and conducted a labor market survey.
In July, 2003, Employer filed a petition for modification as of March, 2003, based on the results of Rehabilitation Counselor’s labor market survey. Hearings before a Workers’ Compensation Judge (WCJ) followed.
At the hearings, Employer presented deposition testimony from its orthopedic surgeon and from Rehabilitation Counsel- or. Thereafter, Claimant testified, but she did not present other witnesses. The WCJ accepted the testimony of Employer’s witnesses and partially accepted Claimant’s testimony. In particular, the WCJ found that there were three positions available to Claimant which she was capable of performing, and he imputed the income of one of the jobs to her, resulting in a reduced compensation rate.1 In sum, the WCJ granted the modification petition.
Claimant appealed, raising various issues, including the failure of the WCJ to make a finding regarding available employment with Employer. Noting that Rehabilitation Counselor’s accepted testimony included his acknowledgment that he was not aware whether additional light [247]*247duty employment with Employer was available, the Workers’ Compensation Appeal Board (Board) vacated and remanded. Bd. Op., 9/7/05, at 3-4; R.R. at 99a-100a. The Board directed that additional findings and conclusions be made as to whether Employer met its burden under Section 306(b)(2) of the Pennsylvania Workers’ Compensation Act (Act), 77 P.S. § 512(2).2 Id.
On remand to the same WCJ, no further hearings were held. The WCJ entered a new decision that contained an extensive finding responsive to the Board’s instructions.3 Essentially, the WCJ relied on an [249]*249exhibit which was introduced during Rehabilitation Counselor’s deposition testimony. The exhibit was the termination letter sent to Claimant and quoted earlier in this opinion.
The WCJ relied upon Burrell v. Workers’ Compensation Appeal Board (Philadelphia Gas Works & Compservices, Inc.), 849 A.2d 1282 (Pa.Cmwlth.2004), for the proposition that an employer need not prove the absence of specific jobs with an employer as a prerequisite to expert testimony of earning power. Based on the Claimant’s 10-month light duty clerical position at the Board of Elections and language in the termination letter that “[Employer] has no provision for a permanent light duty position,” Dep. of Charles Grande at Ex. 1, the WCJ determined Employer could prove its case by expert testimony of earning power. Accordingly, the WCJ again granted modification.
On Claimant’s appeal, the Board affirmed. It agreed with the application of Burrell. Also, it determined the finding that Employer did not have permanent light duty positions available to Claimant was supported in the record by the termination letter.
Claimant appeals to this Court, and she advances two assignments of error.4 First, she contends the compensation authorities committed an error of law in concluding Employer was not required to prove it had no positions available within Claimant’s abilities during the relevant period. Second, she argues that the termination letter, upon which the fact-finder relied in finding no permanent light duty positions available, was incompetent hearsay. Consequently, Claimant contends Employer could not prevail in a modification petition under Section 306(b)(2) of the Act.
As to the first issue, Claimant briefly argues that reliance on Burrell is misplaced. She contends that case was limited to its facts, which involved a modification based on surveillance and not, as here, on medical testimony and a labor market survey. Rather, this case is controlled by South Hills Health System v. Workers’ Compensation Appeal Board (Kiefer), 806 A.2d 962 (Pa.Cmwlth.2002), which holds that Section 306(b)(2) of the Act and Section 123.301 of the regulations5 require an [250]*250employer seeking modification based on a labor market survey to show lack of in-house positions within a specific time frame.
In Burrell, this Court affirmed a modification of benefits based on surveillance showing the claimant working at a new job and on an expert’s opinion as to the pay rates for the work he was performing. Rejecting the claimant’s argument that the employer was required to first prove that it had no positions available, this Court, speaking through your current author, stated:
Neither the express language of Section 306(b)(2) nor the cases decided under it require proof of the absence of specific jobs with employer as a prerequisite to expert testimony of “earning power.” While the statute requires an employer to offer an available position if one exists, it does not require employer to prove the non-existence of such a position. Nor does the statute preclude a claimant from proving the existence of such a position as a defense to modification.
However, we need not decide whether existence of a specific, available position with an employer is part of its burden in other modification circumstances. Rather, we hold that where a claimant unilaterally demonstrates residual productive skill, an employer need not address existence of positions it may have as part of its case-in-chief As previously mentioned, a claimant is always free to inquire into this area as a defense to modification.
Burrell, 849 A.2d at 1287 (emphasis added).
As can be seen from the language quoted above, this Court did not relieve all modification-seeking employers from proving the lack of suitable positions before they may rely on expert testimony of earning power. Rather, we held that where a claimant obtains other employment, an employer need not address available positions it has as part of its case-in-chief.
This case involves a different factual situation. After Employer submitted its evidence, Claimant offered evidence of a suitable position available with Employer. In particular, she testified that after she was terminated from her clerical position with the Board of Elections, another person was hired by Employer to replace her. This testimony was not contradicted. This testimony raises the defense that the posi[251]*251tion Claimant was actually performing was available for her continuing employment at the time she was terminated.
Section 306(b)(2) of the Act speaks in mandatory language on this point: “If the employer has a specific job vacancy the employe is capable of performing, the employer shall offer such job to the employe.” Recognizing that the Act does not address presentation of evidence, we are mindful that the burden of proof may be placed on a party who must prove existence of a fact rather than on a party who must prove its non-existence. Barrett v. Otis Elevator, 431 Pa. 446, 246 A.2d 668 (1969); see In re Property Along Pine Road in Earl Tp., 743 A.2d 990 (Pa.Cmwlth.1999), appeal denied 563 Pa. 668, 759 A.2d 389 (2000).
However, where, as here, the question of an available, suitable job with the employer is raised with evidence, the employer ignores the question at its peril. As with all other elements necessary to succeed in a modification petition, once the issue is raised by evidence of a possible opening •with employer, the employer has the burden of proof. Consistent with the plain language of the Act, once the issue is raised with evidence, satisfaction of this element of proof is a prerequisite to employer’s reliance on expert testimony of earning power.
In addition, without specifying the order in which evidence is produced, the regulations expand on the type of evidence by a claimant which may prevail on the issue of available employment with an employer. The time period in question starts with the notice of ability to return to work and continues until the filing of a petition for modification. 34 Pa.Code § 123.301(b). A claimant may prove that “[djuring the period in which the employer ... had a duty to offer a specific job, the employer ... announced the existence of a specific job vacancy, that the [claimant] is capable of performing, which the employer intends to fin.” 34 Pa.Code § 123.301(f)(2).
Consistent with the regulations referenced above, Claimant offered evidence that between the time of the notice of ability to return to work in November, 2002, and the filing of the petition for modification in July, 2003, a position with Employer that Claimant was capable of performing was announced and filled. The position was the clerical position with the Board of Elections that Claimant performed for 10 months. See R.R. at 52a-53a, 65a, 68a.
In this case, Rehabilitation Counselor, who testified by deposition, did not address the issue. To the contrary, he testified that he did not discuss available positions with Employer. The only evidence Employer submitted on this point was the termination letter admitted during Rehabilitation Counselor’s testimony but only briefly mentioned. The termination letter informed Claimant that “[Employer] has no provision for a permanent light duty position....” Dep. of Charles Grande at Ex. 1. This letter was written before Claimant’s employment ended and before another person was hired to replace her; nevertheless, the WCJ accepted this evidence.
Section 422(a) of the Act, 77 P.S. § 834, contains the “reasoned decision” requirement and states in relevant part, with emphasis added:
All parties to an adjudicatory proceeding are entitled to a reasoned decision containing findings of fact and conclusions of law based upon the evidence as a whole which clearly and concisely states and explains the rationale for the decisions so that all can determine why and how a particular result was reached. The workers’ compensation judge shall specify the evidence upon which the workers’ compensation judge relies and [252]*252state the reasons for accepting it in conformity with this section. When faced with conflicting evidence, the workers’ compensation judge must adequately explain the reasons for rejecting or discrediting competent evidence. Uncon-troverted evidence may not be rejected for no reason or for an irrational reason; the workers’ compensation judge must identify that evidence and explain adequately the reasons for its rejection. The adjudication shall provide the basis for meaningful appellate review.
Contrary to this statutory direction, the WCJ here did not give any reason for rejecting Claimant’s evidence that there was suitable employment available with Employer. In fact, the WCJ did not even reference this uncontroverted, competent evidence. While the WCJ is free to accept evidence in the face of conflicting evidence, he must explain why he does so. The failure to do so here precludes effective appellate review.
Accordingly, we vacate the Board’s order and remand, with direction for further remand to the WCJ. The WCJ shall address the conflict in evidence on suitable work available with Employer and shall address proof of residual productive skill.6
ORDER
AND NOW, this 5th day of February, 2008, the Order of the Workers’ Compensation Appeal Board in the above-captioned matter is VACATED. The case is REMANDED to the Board with instruction for further REMAND to the Workers’ Compensation Judge for the limited purpose of issuing a decision consistent with the foregoing opinion. The record shall not be reopened for additional evidence.
Jurisdiction is relinquished.