Cash and cash equivalents
Cash and cash equivalents increased $818,933 (16.2%) to $5,863,882 as of June 30, 2023 from $5,044,949 as of December 31, 2022. This increase was primarily due to operating cash inflows associated with the progression of our product sales during the period as well as by a reduced effect of negative exchange rates between both periods. This was partially offset by the continued cash outflows related to the construction of the SoHyCal facility.
Accounts receivable, net
Accounts receivable increased $261,452 (12.5%) to $2,360,629 as of June 30, 2023 from $2,099,177 as of December 31, 2022. This increase was mainly due to business expansion during the period arising from the materialization of new projects, from 12 in 2022 to 16 in the second quarter of 2023.
Inventory
Inventory decreased $4,084,006 (66.1%) to $2,090,994 as of June 30, 2023 from $6,175,000 as of December 31, 2022. This decrease was primarily due to the usage of stacks in projects during the period.
Prepaid expenses and other current assets
Prepaid expenses and other current assets increased $329,209 (25.7%) to $1,610,477 as of June 30, 2023 from $1,281,268 as of December 31, 2022. This was mainly due to increased prepayments to suppliers compared to December 31, 2022, partially offset by a decrease in VAT receivables during the period.
Grants receivable
Grants receivable increased $300,736 (40.5%) to $1,043,573 as of June 30, 2023 from $742,837 as of December 31, 2022. This increase was mainly due to grants earned during the period for R&D activities in Spain, in line with prior periods, partially offset by the absence of grants in the United States contrarily to previous periods.
Contract assets
Contract assets decreased $1,945,332 (88.5%) to $252,398 as of June 30, 2023 from $2,197,730 as of December 31, 2022. This decrease was due to the transfer of $2,197,730 from contract assets to receivables associated with timing differences between revenue recognition and customer billings.
PP&E, net
PP&E, net increased $5,827,589 (113.2%) to $10,975,606 as of June 30, 2023 from $5,148,017 as of December 31, 2022. This increase was primarily due to increased assets under construction, mainly related with the SoHyCal facility, partially offset by an increase in accumulated depreciation as of such date.
Operating lease — Right of use asset, net
Right of use assets decreased $223,183 (10.0%) to $2,012,671 as of June 30, 2023 from $2,235,854 as of December 31, 2022, with a corresponding decrease in long-term operating lease liabilities. This decrease was primarily due to a $212,834 reduction adjustment in the right-of-use due to a lease amendment signed in February 2023 for one of the California lease agreements.
Equity method investments
Equity method investments amounted to $119,544 as of June 30, 2023 from nil as of December 31, 2022, which is attributed to our investment in two joint ventures during the first half of 2023. One of our joint ventures, GreenH Electrolysis Private Limited, became operational on March 15, 2023. The Company holds a 50% ownership stake in this venture. Similarly, our second joint venture, H2V2 Mexico, S.A. de C.V., commenced operations on March 30, 2023, with the Company holding a 40% ownership interest as of June 30, 2023. These equity method investments amounted to $126,576 for the period, partially offset by losses of unconsolidated investments of $7,032. See Note 7 to the 2023 Unaudited Interim Condensed Consolidated Financial Statements of H2B2 for further information.