The following charts show the composition of the power segment’s Adjusted EBITDA and AFFO for the years ended December 31, 2013 and 2012: Revenue  increased by $14,710, or 8.2%, while total power production increased by 301.7 GWh, or 16.2%. Higher revenue was primarily attributable to higher power generation and power rates at Cardinal and to the contribution from the wind power facilities. The facilities acquired from ReD on October 1, 2013 added $5,714 of revenue while Erie Shores benefited from more favourable wind conditions in 2013, adding $1,981 of  revenue. All other facilities had higher revenue in 2013, except Amherstburg Solar Park ("Amherstburg"), which experienced less sunlight than in 2012. Expenses  increased by $3,872, or 3.8%, with ReD's wind facilities contributing $1,475 and project development costs increasing by $1,146 for salaries and overhead of Capstone's power development subsidiary, which was launched in December 2012. In addition, Cardinal's operating  expenses increased by $580 due to more fuel being consumed as a result of higher production, partially offset by lower fuel transportation costs due to a decline in TCPL rates. Distributions from equity accounted investments increased s $878, primarily due to receipts from Capstone's 49% indirect ownership interest in the Glen Dhu wind facility. Non-controlling interests and distributions from businesses with NCI  increased by I $786 and $1,565, respectively, due to Capstone's partner's share of the Adjusted EBITDA in Amherst and distributions received from Amherst. Interest paid  increased by $938, or 5.4%, primarily due to $1,068 for the hydro power facilities' debt, which was established in June 2012, followed by $681 of additional interest paid by ReD's wind facilities. This was partially offset by $609 less interest paid on the debt of Amherstburg and Erie Shores as a result of amortization. Maintenance capital expenditures  decreased by  s $1,011, primarily due to Cardinal's 2012 hot gas path inspection, which occurs every three years.  Scheduled repayments of debt principal  increased by $2,305, or 18.3%, primarily due to $1,000 higher payments for the CPC-Cardinal credit  facility. In addition, debt repayments increased by$659 for debt on the ReD wind facilities. 2013 ANNUAL REPORT  29 pp  37% Gas  $_{pp}$ 28% Wind $_{pp}$ 7% Biomass  $_{pp}$ 12% Hydro $_{pp}$ 16% Solar ADJUSTED EBITDA 2013 $_{pp}$ 34% Gas  $_{pp}$ 24% Wind pp  9% Biomass  $_{pp}$ 14% Hydro $_{pp}$ 19% Solar ADJUSTED EBITDA 2012 $_{pp}$  54% Gas  $_{pp}$ 23% Wind $_{pp}$ 12% Biomass  $_{pp}$ 4% Hydro $_{pp}$ 7% Solar AFFO 2013 $_{pp}$ 53% Gas  $_{pp}$ 16% Wind $_{pp}$ 15% Biomass  $_{pp}$ 5% Hydro $_{pp}$ 11% Solar AFFO 2012